SIT S.p.A.

The best technical application solution in power transmissions.

SIT develops, engineers, manufactures and distributes high quality solutions and components for power transmission for industrial applications of excellence worldwide, with the aim of increasing the productivity of its customers’ machines and systems.

SIT Power Trasmissions

SIT Timing Belt Drives

SILENTSYNC® Belts and EAGLE Pulleys

SILENT SYNC® is an innovative double helical offset tooth drive which, thanks to continuous and progressive meshing between belt and pulley, provides very high performance in terms of both noiseless and precision, reducing vibration.

Belt characteristics

Pitch: 8M – 14M
Compound: HNBR
Belt facing: JPEX (layer of nylon fabric and high density polyethylene)
Static Conductive (ISO 9563)
Temperature: -30/+95 °C (for short periods: -40/+130 °C)

Benefits

High torque transmission
Noise reduction up to 15 decibels compared to any other type of toothed belt
Low energy consumption
Drastic reduction of vibrations
Self-aligning transmission (the pulleys do not require flanges)

GIGATORQUE Belts and GTR pulleys

GigaTorque is the most powerful timing belt available in the market today. Made of a premium HNBR rubber and a high modulus carbon fiber cord, it is the most advanced solutions for heavy duty applications.
GigaTorque belt construction allows user to design compact drives and have a greater power capability, resulting in lower shaft loads.

SIT manufactures a full range of GTR pulleys suitable for any application.

Belt characteristics

Pitch 8M – 14M
High-tensile strength carbon cord
High hardness compound rubber (HNBR)
Special low friction tooth fabric
Temperature: -30/+130 °C

Benefits

Higher power rating
20% more lifetime vs competitor
Minimum tension decay
No maintenance costs

Pulleys and Belts TOP DRIVE® HTD

SIT TOP DRIVE® HTD belt is an evolution of standard positive drive belts. The tooth shape is the HTD profile according to ISO 13050. This profile has been used for many years in a wide range of applications and it is well known for its outstanding performances. Power transmission is much higher compared to the classic inch trapezoidal profile.

The circular-arc tooth profile provides superior tooth jump resistance and provides a smooth tooth engagement. The noise level is remarkably reduced if compared to the classic trapezoidal belts. For each pitch a wide range of lengths and widths is available.

Belt characteristics

HTD Profile
Pitch: 3M, 5M, 8M, 14M
Dual pitch: D5M, D8M, D14M
Compound: Polychloroprene
Tensile members: Fiberglass
Belt facing: Nylon
Temperature: -20/+100 °C
Available TOP DRIVE® HTD timing belts in open end version with relative clamping plates.

Benefits

Good quality/price ratio
Wide range of lengths and widths
Maintenance-free
High efficiency

Pulleys and Belts MUSTANG® SPEED HTD

These heavy-duty synchronous belts are specifically designed for high power applications at high speed.

The HTD tooth profile complies with ISO 13050. The wide range of available sizes makes the SIT MUSTANG® SPEED HTD a good fit for new projects as well as for MRO.

Belt characteristics

HTD profile
Pitch: 3M, 5M, 8M, 14M
Dual pitch: D5M, D8M, D14M
Static Conductive (ISO 9563)
Compound: Polychloroprene
Tensile members: Fiberglass
Belt facing: Polyamide
Temperature: -20/+100 °C
Available SIT MUSTANG® SPEED timing belts in open end version with relative clamping plates.

Benefits

High power rating
Excellent price/power ratio
Longer belt life
High power rating
Low friction coefficient
Efficiency up to 98%
Maintenance-free

Pulleys and Belts MUSTANG® TORQUE HTD

These heavy-duty synchronous belts are specifically designed for high torque applications at low speed. SIT MUSTANG® TORQUE belts are among the best performing HTD profiled belts on the market.

The extreme high-performance permit very compact drives, saving space and reducing first installation costs. The HTD tooth profile complies with ISO 13050.

Belt characteristics

HTD profile
Pitch: 8M, 14M
Static Conductive (ISO 9563)
Compound: NBR
Tensile members: Aramid
Belt facing: Polyamide (double)
Temperature: -20/+100 °C
Available SIT MUSTANG® TORQUE timing belts in open end version with relative clamping plates.

Benefits

High transmissible power and loads
Longer belt life
Maintenance-free
Low friction coefficient
Efficiency up to 98%

Pulleys and Belts HI-PERFORMANCE Pd® Plus RPD

SIT Hi-Performance Pd® Plus synchronous belts provide a reliable, economical, and trouble-free alternative to transmit power. With reduced drive weight and cost when compared to classic V-belts. Lubrication and tensioning devices are not required thus creating a cleaner, maintenance free synchronous drive. SIT Hi-Performance Pd® Plus belts have been designed for performances exceeding the traditional limitation of the first generation of HTD belt drives.

Belt characteristics

RPD/HTD profile
Pitch: 3M, 5M, 8M, 14M
Dual pitch: D5M, D8M, D14M
Static Conductive (ISO 9563)
Compound: Polychloroprene
Tensile members: Fiberglass
Belt facing: Polyamide (double)
Temperature: -20/+100 °C
Available SIT HPPD PLUS timing belts in open end version with relative clamping plates.

Benefits

Universal tooth profile suitable for HTD pulleys
Higher power rating compared to standard HTD
Maintenance-free
High efficiency

Pulleys and Belts TOP DRIVE® SUPER TORQUE STD

SIT TOP DRIVE® STD – SUPER TORQUE belts carries some significant advantages over standard synchronous belts.

The belt profile is designed in a way that during operation the forces are distributed throughout the entire belt tooth to disperse critical stresses over more area. The result is a reduced tooth shear and longer belt life.

SUPER TORQUE is the ideal solution for nearly every industrial drive application where accurate shaft synchronization is required and it also represents a great alternative to V-belts and chain drives.

Belt characteristics

Pitch: 3M, 5M, 8M, 14M
Dual pitch: D5M, D8M, D14M
Compound: Chloroprene
Tensile member: Fiberglass
Belt facing: Polyamide
Temperature: -30/+75 °C

Benefits

Low vibrations
Reduced backlash
Maintenance-free
High efficiency

Pulleys and Belts MUSTANG® SPEED SUPER TORQUE

Thanks to the skilful choice of latest-generation components and the most innovative production processes, SIT is able to offer products with high values of transmissible power, lack of noise and high efficiency. With SIT MUSTANG® SPEED belts with SUPER profile it is possible to design power transmission solutions by halving the overall dimensions. Indeed, these belts transmit more than twice that of belts with the first-generation SUPER TORQUE profile.

Belt characteristics

Pitch: 3M, 5M, 8M, 14M
Static Conductive (ISO 9563)
Compound: Chloroprene
Tensile members: Fiberglass
Belt facing: Polyamide (double)
Temperature: -20/+100 °C
Dual pitch: D5M, D8M, D14M

Benefits

Efficiency up to 98%
High torque transmission
Low vibration
Quieter operation
Maintenance free

Pulleys and Belts CLASSICA – IMPERIAL PITCH

The SIT CLASSICA synchronous belt, being designed with imperial pitch, is an valid and economic alternative solution in low/medium torque transmission systems. Reduced elongation, no need for lubrication and low wearing makes this belt an economic and reliable option.

In addition, The SIT CLASSICA synchronous belt can be used in a wide range of powers and for speeds up to 30 m/s.

Belt characteristics

Imperial Pitch: MXL, XL, L, H, XH
Imperial Pitch – Dual: XL, L, H
On request it is possible to supply static conductive belts (some pitch and lengths)
Compound: Polychloroprene
Tensile members: Fiberglass
Belt facing: Polyamide
Temperature: -30/+80 °C
Available timing belts in open end version with relative clamping plates

Benefits

Maintenance-free
Wide range of pitches and lengths
High efficiency

Pulleys and Belts – Falcon Pd® GTR

Thanks to innovative construction materials enabling high torque transmission and reduced dimensions, FALCON Pd® is an ideal solution for designing new applications.

SIT manufactures a full range of pulleys suitable for any application.

Belt characteristics

Pitch: 8M – 14M
Compound: HNBR
Belt facing: layer of nylon fabric and high density polyethylene
Static Conductive (ISO 9563)
Temperature: -40/+95 °C (for short periods: -50/+130 °C)
Available FALCON Pd® timing belts in open end version with relative clamping plates.

Benefits

Very high torque transmission
Outstanding tensile strength for ultra-high performance
Reduce operating noise levels
Excellent oil resistance

SIT Polyurethane Belt Drives

ELATECH® M and V – Polyurethane belts

ELATECH® M open end belts are produced in standard roll length of 100 meters and delivered to any desired length. The excellent precision and dimensional stability and the high abrasion resistance make them ideal in all linear motion applications.

ELATECH® V are jointed belts obtained from open-end belts. The special manufacturing process, allows for obtaining any desired length. Due to the high flexibility and to the unique precision in positioning offered, ELATECH® V belts are ideal for all conveying applications where synchronization is needed.

Belt characteristics

Pitch:
- T (2,5 – 5 – 10 – 20) | AT (3 – 5 – 10 – 20) | SAT (10)
- TK5-K6 – TK10-K6 – TK10-K13 (SELF CENTERING) | ATK5-K6 – ATK10-K6 – ATK10-K13 (SELF CENTERING)
- MXL – XL – L – H – XH
- HTD (3 – 5 – 8 – 14) | RTD (5 – 8 – 14) | STD (5 – 8 – 14)
- EAGLE (5 – 8 – 10 – 14)
- FLAT (1 – 2 – 2,5 – 3 – 9)
- POLY-V K
- T10 – AT10 – HTD8 – Total Protection | TT5

Double sided tooth construction available
Antistatic properties according to ISO 9563
Certified to be according RoHS 2011/65/UE
Working temperatures between: -25°C to + 80°C
Tension cords: steel with high tensile strength (Special cords on request)
Compound: thermoplastic polyurethane 92 Sh. A with high wear resistance

Benifits

Excellent length stability
High abrasion resistance
Maintenance free
High linear and angular positioning precision

ELATECH® SYNCRO MAX® belts

ELATECH® SYNCRO MAX® Extra-wide Polyurethane Belts extend the advantages of synchronous timing belts to wider surfaces and to the typical applications of flat and modular conveyor belts.

Made of Polyurethane and reinforced with Aramid, ELATECH® SYNCRO MAX® Extra-wide Belts provide positive drive and synchronous conveying resulting in no slippage, better tracking, higher indexing/positioning precision, smaller drive pulley requirements, lower belt tension, lower shaft loads and consequently power saving.

Belt characteristics

Pitch: metric T10 – inch H
Natural color PU compound material
Working temperatures between: -25/+80 °C
Tension cords: Kevlar (Aramid) parallel cord reinforcement
Compound: thermoplastic polyurethane 92 Sh. A with high wear resistance

Benefits

no slippage even when used in applications with presence of oils or grease
positioning accuracy even at high linear speed
very low noise compared to applications with plastic modular belts
smaller drive pulley requirements
energy saving as a result of low-tension and low friction forces in effect

Truly Endless ELATECH® ELA-flex SD®

ELA-flex SD® timing belts are manufactured with truly endless high-tension strength steel tension cords and high wear, abrasion and tear resistant polyurethane.

Having no splice or welding, the belts have no weak cross sections. ELA-flex SD® timing belts are therefore ideal for high speed power transmission and high load conveying applications.

The unique high-tech manufacturing process designed by our research and development allows the production of every belt length, tooth by tooth from a minimum of 800 mm to a maximum of 24.000 mm to permit the best flexibility in application.

Belt characteristics

Pitch:
- T (5 – 10 – 20) | AT (5 – 10 – 20)
- MXL – XL – L – H – XH
- HTD (5 – 8 – 14) | RTD (5 – 8 – 14) | STD (5 – 8 – 14)
- EAGLE (8 – 10 – 14)
- FLAT (2 – 2,5 – 3 – 9)
- ATK10 – K6
- ATM10

Double sided tooth construction available
Antistatic properties according to ISO 9563 on request
Certified to be according RoHS 2011/65/UE
Working temperatures between: -25°C to + 80°C
Tension cords: made of steel with high tensile strength and high elastic modulus.
Compound: thermoplastic polyurethane 92 Sh. A with high wear resistance

Benefits

Excellent length stability
The minimum tension decay
High abrasion resistance
High linear and angular positioning precision
Silent operations
Maintenance free

ELATECH® iSync® belts

Elatech iSync® timing belts are innovative high-performance belts for power transmission made with polyurethane resin body and tension cords in steel or aramid fiber. The high elastic modulus of tensile cords allows a good dimensional stability under load. The production process, based on a unique and highly sophisticated technology, together with the high quality of the materials in use make Elatech iSync® belts extremely precise. Moreover, Elatech iSync® belts allow to transmit up to 30% more than the T and AT conventional belts resulting in long lasting belts or in a more compact drive.

Belt characteristics

Pitch: T2,5 | T5 | T10 – TV10 (Vacuum application) | AT 5 – 10 | XL – L
Available on request MXL – H – HTD5M and double sided tooth construction DT5 – DT10
Working temperatures between: -10/+80 °C
Tension cords: steel with high tensile strength (On request: Aramid Fiber | Stainless Steel | HFE – high flexibility)

Benefits

High performance power transmission
Maintenance free
Superior length stability
Clean power transmission without dispersion of dust
High chemical resistance and in particular to oils, greases and gasoline
High abrasion resistance

Special polyurethane belts

Thanks to top-quality, state-of-the-art machinery and techniques such as water jet cutting, ELATECH® timing belts can be mechanically processed to perform special and complex tasks. The extremely precise machining and finishing operations guarantee the respect of the strictest tolerance requirements and the maximum reliability of ELATECH® timing belts in all the most complex and demanding industrial applications.

Benefits

Unique solution
Customization
Technical/economic optimization

ELAClean® Polyurethane belts for food industries

ELAClean® SIT-ELATECH belts are a new range of monolithic belts made of homogeneous, thermoplastic polyurethane, specifically designed for food contact and suitable to meet the required hygiene standards. They are available in various profiles and surface finishing, ensuring quality, precision and customizations for a wide range of applications.

All ELAClean® SIT-ELATECH belts can withstand oil, grease, cleaning agents, bacteria, making them exceptionally easy to clean and suitable in critical hygiene applications (e. g. when processing meat, poultry or seafood, dough and fresh dairy products). In addition to those benefits, ELAClean® belts can be also customized (e. g. with profiles, flights and sidewalls) to handle a wide range of conveying jobs.

ELAClean® meets the requirements of the food industry in terms of efficiency, safety, and compliance with regulatory standards, offering:

Reduced downtime for maintenance and replacement thanks to the high-performance polyurethane that minimizes the risk of belt failure due to tear and wear;
Easy cleaning, maintenance and increased overall hygiene of the food production environment, thanks to the smooth and seamless surface;
Durability and reliability of conveying surface that ensuring an efficient flow of materials throughout the production line.

ELAClean® range includes:

– Positive drive belts tooth pitch 26mm (EC-P1)
– Positive drive belts tooth pitch 50mm (EC-P2)
– Self centering positive drive belt tooth pitch: 39.7mm (EC-C4)
– Flat belts belt thickness: 3mm (EC-F3)

Each one of these can be provided with specific surface finishing, according to different application needs.

Glossy surface: excellent cut resistance, good product adherence, suitable for incline and decline conveying, improve precise positioning (dry/semi-dry products);
Matte surface: good product release, suitable for product highspeed conveying operations;
No-Cling surface: excellent release properties, recommended for incline and decline conveying and prevent vacuum effect.

ELAClean® customization options available:

Accessories for the belt (straight cleats, inclined cleats, scoop cleats, v-guides and corrugate sidewalls);
Accessories for the conveyor (sprockets, rollers, idler, retainer rings and adaptors);
Tools for the transformation and customization.

Typical applications:

Dairy;
Meat;
Poultry;
Snack;

Fruit;
Vegetable;
Seafood;
Fish.

Aluminum Timing Pulleys and Timing Bars

SIT offers a large range of aluminum pulleys (pitch T and AT, EAGLE) and timing bars for many kinds of industrial applications.

Clamp Plates

Clamp plates are available for timing belts with different types and widths, which make it possible to transform the rotary motion of the pulleys in alternating rectilinear motion for linear drives. Standard material aluminum.

SIT V-Belt Drives

Moulded Cog Narrow NEXT® V-Belts and V-Pulleys

New high performance narrow-section moulded cog V-belts. The considerable service life, stability and flexibility characterize its performance. SIT NEXT® V-belts are manufactured with abrasion-resistant components and designed with optimum moulded cog to transmit high torque in extreme applications.
The special EPDM compound guarantees maximum performance in a wide temperature range and thanks to the ISO SET length tolerance system, it is possible to install multi belts drives with no matching requirements.
The new SIT NEXT® belts are maintenance-free and keep the tension stable during their service life without requiring periodic retensions. Heavy-duty applications will no longer be a challenge.

Belt characteristics

Profile: XPZ – XPA – XPB – XPC
Static Conductive (ISO 1813)
Temperature: -40/+130 °C
Tensile members: Low strech polyester
Compound: EPDM (Ethylene-Propylene Diene Monomer)

Benefits

Maintenance-free
High Power rating
Efficiency and energy saving
ISO SET

Envelope Narrow MAXSTAR POWER® and V-Pulleys

Narrow-section MAXSTAR POWER® belts (ENVELOPE) with exceptional life span even for applications in harsh environments.
The MAXSTAR POWER® belts are trapezoidal for high performances, specifically designed to transmit high torque in extreme applications.

Entirely clad in a layer of special high-resistance fabric, they do not require special selections to create multiple transmissions.

Using MAXSTAR POWER® belts produces very low tension relaxation values that mean the belt does not need to be tightened during the working cycle (Virtually Maintenance Free). Lengths over 3000 mm are available.

Belt characteristics

Profile: SPA – SPB – SPC
Static Conductive (ISO 1813)
Temperature: -30/+90 °C
Tensile members: Polyester (HMLS)
Compound: Chloroprene

Benefits

Fiber rich compounding for greater stability
Maintenance-free with an increase in productivity
Higher modulus cords for greater horsepower
Double layer fabric coating for increased durability

TORQUE FLEX® Narrow V-Belts and V-Pulleys

SIT TORQUE-FLEX® – Narrow “XP” high-performance belts are manufactured in accordance with European standards ISO 4184 and DIN 2215. Designed for operating at high speeds over small diameter pulleys and short center distances. Also, for use in multiple v-belt drives where high shock load and heavy-duty loads are encountered. They do not require special selections to make multiple transmissions, as they are constructed according to the Matchmaker® System that ensures improved production tolerances compared to the limits imposed by the regulations.

Belt characteristics

Profile: XPZ – XPA – XPB – XPC
Static Conductive (ISO 1813)
Temperature: -20/+70 °C
Tensile members: Vytacord (High resistance polyester)
Compound: Wingprene

Benefits

Guaranteed dimensional stability
Higher flexibility (Moulded Cog)
Reinforced tension members
Matchmaker® System

TORQUE FLEX® Classical V-Belts and V-Pulleys

SIT TORQUE-FLEX® – Classical high-performance belts are manufactured in accordance with European standards ISO 4184 and DIN 2215. Designed for operating at high speeds over small diameter pulleys and short center distances. Also, for use in multiple V-belt drives where high shock load and heavy-duty loads are encountered. They do not require special selections to make multiple transmissions, as they are constructed according to the Matchmaker® System that ensures improved production tolerances compared to the limits imposed by the regulations.

Belt characteristics

Profile: ZX – AX – BX – CX
Static Conductive (ISO 1813)
Temperature: -20/+70 °C
Tensile members: Vytacord (High resistance polyester)
Compound: Wingprene

Benefits

Guaranteed dimensional stability
Higher flexibility (Moulded Cog)
Matchmaker® System

Envelope WEDGE V-Belts and V-Pulleys

SIT – WEDGE® belts are manufactured in accordance with American standards RMA and MPTA.

SIT – WEDGE® belts are available in two different ranges:

MC range (Raw Edge and Moulded Cog): up to 2995 mm length
E range (Envelope): over 2995 mm length

SIT WEDGE® V-Belts are constructed according to the Matchmaker® System that ensures improved production tolerances compared to the limits imposed by the regulations.

Belt characteristics

Profile:
- 3VX – 5VX – 8VX
- 3V – 5V – 8V

Static Conductive (ISO 1813)
Temperature: -20/+70 °C
Tensile members: Vytacord (High resistance polyester)
Compound: Wingprene

Benefits

Guaranteed dimensional stability
Higher flexibility (Moulded Cog)
Reinforced tension member
Matchmaker® System

Envelope Narrow MAXSTAR® V- Belts and V-Pulleys

Envelope narrow v-belts with exceptional durability for applications even in severe environments. Envelope V-belts, by MITSUBOSHI, are manufactured in accordance with European standards ISO 4184 and DIN 2215.

Belt characteristics

Profile: SPZ – SPA – SPB – SPC
Static Conductive (ISO 1813)
Temperature: -30/+90 °C
Tensile members: Polyester
Compound: NR/SBR

Benefits

Guaranteed dimensional stability
Fully covered with high resistance fabric
Precision Matched

Envelope Classical MAXSTAR® V- Belts and V-Pulleys

Envelope classical V-belts with exceptional durability for applications even in severe environments. Envelope V-belts, by MITSUBOSHI, are manufactured in accordance with European standards ISO 4184 and DIN 2215. Also available in BARE BACK version.

Belt characteristics

Profile: Z – A – B – C – D
Static Conductive (ISO 1813)
Temperature: -40/+70 °C
Tensile members: Polyester
Compound: Chloroprene

Benefits

Guaranteed dimensional stability
Excellent resistance to fatigue
Precision Matched

EXCELITE® ES V-belts and V-Pulleys

SIT EXCELITE® ES belts are manufactured in according with ISO 4184 and DIN 2215.

Due to the special insulation filler and the treatment of the tensile members, we are able to achieve a strong adhesion between cords and rubber base.

For this reason, SIT EXCELITE® ES belts can be used in a wide range of industrial and agricultural applications and guarantee high reliability, long lifetime, with excellent performance/price ratio.

Belt characteristics

Profile:
- SPZ – SPA – SPB – SPC
- Z – A – B – C – D

Static Conductive (ISO 1813)
Temperature: -40/+70 °C
Tensile members: Polyester
Compound: fiber loaded rubber

Benefits

Constant length (ISO specification)
Excellent resistance to fatigue
Excellent performance/price ratio
Precision Matched

MAXSTAR® BANDATE V-Belts and V- Pulleys

SIT BANDED belts are built with strong Polyester tension members. This provides the high-strength, high-horsepower rating capacity needed to effectively transmit drive power.

SIT BANDED belts are available in a cut-edge construction with cogs for increased flexibility and heat dissipation or envelope construction for drives where pulsation, shock loads, high tension, and long centers are involved.

Belt characteristics

Profile:
- XPZ – XPA – XPB – XPC
- SPA – SPB – SPC
- 3V – 5V – 8V
- BX – CX

Static Conductive (ISO 1813)
Temperature: -20/+70 °C
Tensile members: Vytacord (Polyester)
Compound: Wingprene (fiber loaded rubber)

Benefits

Guaranteed dimensional stability
Heat, ozone, and abrasion resistant

Perforated open-end V-belts and V-Pulleys

PERFORATED Open-end V-belts are made of special mixture of rubber and canvas. Thanks to their joining system they can be assembled without requiring machine disassembly. The belts are pre-drilled, have an angle of 40° and are available in rolls of max. 100 meters.

Belt characteristics

Profile: Z – A – B – C

V-Pulleys

V-pulleys according to DIN2211 – ISO 4183 (except C type ) suitable for standard application for use with the belt types SPZ – SPA – SPB – SPC (ISO 4184 DIN 7753/1), classical Z – A – B – C (ISO 4184 DIN 2215) and American Narrow 3V – 5V – 8V (RMA-MPTA).

Type of V-Pulleys

V-Pulley PT Solid Hub
Material: Cast Iron DIN 1691 GG20 – GG25

V-Pulley pulleys PBT for mounting SER-SIT® Taper bushing
Material: Cast Iron DIN 1691 GG20 – GG25

V-Pulley pulleys PCT oversized hub for Self Locking Units (SIT-LOCK® CAL 8)
Material: Cast Iron DIN 1691 GG20 – GG25

Our V-Pulleys can be used for application with a speed up to 35 m/s. the pulley dimensions are very accurate as they are manufactured by means of CNC or automatic lathes. For higher speed it is strongly recommended to use steel as material of construction.

Adjustable Pulleys

Static adjustable pulleys “PR DV” and “PBR DV” are designed to allow adjustment of pitch diameters.

One flange is screwed on the threaded hub. The movable flange is provided with set screws for fixing into the required position. They are suitable for Z-SPZ-3V; a-SPA; b-SPB-5V; C-SPC section V-belts.

Adjustable Pulley types

“PR DV” with solid hub
“PBR DV” for mounting SER-SIT® taper bushing

Variable speed drive – VARIO

The SIT VARIO belts are used for high power transmission on variable speed drive systems.

Belt characteristics

Wide range of sections and lengths
Temperature: -30/+75 °C
Tensile members: Flexten® (similar performances to Aramid)
Compound: Chloroprene
Oil, ozone and abrasion resistance

Variable Speed Pulleys – VAR

The variable speed pulley is a well established drive; designed to give continuous speed variation at a comparative low cost. Unfortunately, it is well known that this design is subject to excessive flange wear due to the type of drive systems employed.

The hub is made from induction hardened steel, hard chrome plated and ground to give uninterrupted slide fit with flanges. Keys are not used with this application. Moving flanges give a wide contact area therefore eliminating uneven belt pressure. The pulley flanges are coupled by means of nylon (6,6) sleeve couplings to the outside of the flanges and by two flats machined on each end of the pulley hub. Two springs situated inside the nylon coupling give the desired pressure.

Fixed Pulleys

Fixed driven pulley have been specifically designed to be used with VAR pulleys. They are manufactured in grey cast iron (GG20 -GG25) and are treated with a black manganese phosphating process.

SIT Poly-V Belt Drives

Poly-V belts have triangular section longitudinal ribs. Thanks to the reduced thickness, these belts are very flexible and can be wind up on very small diameters. Poly-V belts can achieve higher peripheral speed than V-belts.

Belt characteristics

Standard profiles: H – J – K – L – M
Static Conductive (ISO 1813)
Temperature: -20/+80 °C
Tensile member: Polyester
Compound: Chloroprene
Available belts with Aramid tensile members for heavy applications

Benefits

Compact dimensions
High Flexibility
High peripheral speed
High efficiency
Low noise
Possibility of using flat pulleys reducing the cost of the system

SIT Chain Drives

Sprockets

Sprockets for simplex, duplex and triplex chain according to DIN 8187 – ISO/R 606. Sprockets with induction hardened teeth, with finished bore, keyway and 2 set screws according to DIN 8187 – ISO/R 606. Idler sprockets with ball bearing.

Available on request:

stainless steel
for mounting taper bushing
induction hardened teeth with pilot bore
in according to standard ASA

Platewheels

Plate wheels for simplex, duplex and triplex chain according to DIN 8187 – ISO/R 606.

Available on request:

stainless steel
cast iron
in according to standard ASA

Chain drives

SIT S.p.A. is able to offer chains with high resistance to wear and fatigue according to DIN 606, conveyor chains with straight or right-angle attachments, rubber coated jumpers and protruding pins, accumulation chains or suitable for lifting heavy loads at low speeds.

SIT Modular Belts and Chains

Straight Modular Belts

Available with pitches ranging from 1/2“ to 2“ in a wide array of designs for any application, from food handling to heavy-duty conveying. Available in different materials depending on the application.

Wide range of flights and side wall in different heights, materials and designs. In addition to a range of stamped sprockets, SIT can supply specially made sprockets in different materials, designs and numbers of teeth.

Curved Modular Belts

Designed for curved conveying paths. Also suitable for straight paths. Wide range of curvatures starting from 1.4 m. Available in different materials depending on the application.
Wide range of flights and side wall in different heights, materials and designs. In addition to a range of stamped sprockets, SIT can supply specially made sprockets in different materials, designs and numbers of teeth

Straight Modular Chains

Designed for the handling of bottles and cans in conveying, transport, packaging and accumulation line facilities. Made from low-friction POM acetal resin, with stainless steel pins.

Curved Modular Chains

Designed for curved conveying paths. Made from low-friction POM acetal resin, with stainless steel pins.

SIT Drive Regulation

Motor bases

Different motor bases types for electric motor, designed for the correct tensioning of all types of belt drives.

COMPATTA (size 80 ÷ 225)
VAREX (size 56 ÷ 132)
LINEA (size 56 ÷ 400)
TV909/910 – longitudinal slide
TB911 – tilt slide

Automatic tensioners

TA series automatic tensioners, with universal application, keep tension constant on belts or chains drives, automatically balancing elongations. The constant tension grants the transmission an increase in duration and the reduction of vibrations.

Antivibration Mounts SIT-Paulstra

SIT-PAULSTRA elastomeric mounts SIT-PAULSTRA control and isolate noise, impacts and vibrations to provide ideal conditions for the operation of machines and equipment, extending their service life and protecting the environment. The use of sophisticated calculation and simulation software maximizes results while minimizing costs. Very wide range for industrial and civil use.

Antivibration Mounts types:

high radial flexibility
high axial flexibility
equi-frequency
low frequency (highest axial flexibility)

TEN-SIT® 2.0 electronic device for belt tension measuring

TEN-SIT® 2.0 is a new electronic gauge, used for the correct tensioning of all types of belt drives.

Its operating principle is based on the relationship between belt tension and the vibration frequency of the belt itself. TEN-SIT® 2.0 is able to accurately measure the tension of any belt due to its flexible microphone, filtering undesired noise.

Benefits

Handy and versatile
Suitable for any kind of belt
New sensitivity range 8 ÷ 600 Hz

LINE-LASER® pulleys alignment laser device

In order to get the proper performances and lifetime of the belt drive, pulley must be correctly aligned. The LINE-LASER® is the ideal solution for the perfect and quick alignment. Light and reliable, it combines the laser technology precision with the easy use.

SIT Couplings

TRASCO® ES couplings

TRASCO® ES is our zero backlash coupling designed to compensate for misalignment and vibration dampening for indexing applications. The compact design of TRASCO® ES makes it the right choice for all precise motion applications. Absorbs shock and vibration through an elastomeric ring in different hardnesses.

Features

Absorbs shock and vibration through an elastomeric ring in different hardnesses
Also suitable for axial or blind mounting
Available in clamp coupling design, fitting ring
Available on request certified couplings according to ATEX directive 2014/34/EU

TRASCO® ES couplings available executions

GESP executions solid hubGESF with finish bore and setscrew

GESMC executionWith clamp hub compact version

GESM executionWith clamp hub

GES2M executionSlit clamping hub execution

GESA executionShrink disc execution

GESAP executionShrink disc execution according to DIN 69002

GESS executionDouble cardanic execution

GES LR1 executionWith intermediate shaft

GES LR3 executionWith intermediate shaft

SERVOPLUS® bellows couplings

SERVOPLUS® bellows couplings are the perfect coupling in all servo motor applications where high torsional rigidity, truly backlash free torque transmission, low inertia, and superior reliability are required.

Features

backlash free for highest torque transmission precision
low moment of inertia
excellent dynamic characteristics for superior drives at high speed and torque inversions
allow for axial, radial and angular misalignment
easy mounting
high torsional rigidity
wear and maintenance free
working temperature up to 300 °C
innovative modular execution

The innovative modular system allows competitive costs and very quick delivery for any shaft combination. Additional benefits include bellows replacement without moving shaft.

SERVOMATE® couplings

SERVOMATE® disc couplings have been specially designed for servomotor applications.

The aluminum hubs and the compact design provide low mass moment of inertia resulting in a reliable and maintenance free coupling for high speeds. The double disk pack execution has been designed for applications with radial misalignment.

SAFEMAX® Torque Limiters

In industrial applications, the increase of, automation in the manufacturing processes is becoming a strict requirement; performances are constantly improving Ever the increase of precision utilizing servo systems results in the increase of higher speeds.

Moreover, in order to improve the production capacity it is also important the increase of stiffness of the systems thus the increase of the resistance to global dynamic loads.
The torque overload generated by human error, mechanical malfunction or other causes is, however, unpredictable and if not intercepted can damage to the machine and, consequently, cause downtimes which can be long and, therefore, expensive.

SAFEMAX® Torque Limiters prevent these problems from happening through instant disengagement of the motor side from the driven side in case of torque overload, thus eliminating the risk of expensive downtimes. In addition, our torque limiters, being torsionally rigid and backlash free, allow a rapid and accurate resumption of machine operations once the cause of the overload has been eliminated.

Features

Low moment of inertia
Compact design
Maintenance-free
Disengagement within 1-3 milliseconds
Easy and safe adjustment of the torque
Re-engagement to 360° or in phase

METALDRIVE® disc couplings

METALDRIVE® disc couplings are fully made of steel and are used in all applications where high reliability, precision, and no maintenance are required. All the components of the METALDRIVE® couplings are completely machined (spacer excluded) and balanced in class DIN ISO 1940-1 Q 6,3.

Features

Backlash free and torsionally rigid
Maintenance, lubrication and wear free
Operating temperature up to 300° C
Allow axial, angular, and radial misalignment (only with double disc pack)
Available in conformity to API 610 e API 671
Available with carbon shaft
Available on request certified couplings according to ATEX directive 2014/34/EU

SITEX® ST couplings

SITEX® ST couplings are fully manufactured in high quality steel. They are made of 1 or 2 geared hubs which are coupled with one sleeve through which the torque is transmitted. The special OPTIGEAR profile allows very high torque transmission and the compensation of axial, angular and radial misalignment (only in the version with 2 hubs). The maximum recommended working temperature is -10 °C a + 80 °C.

Features

OPTIGEAR profile
Interchangeability
The most compact solution
Special executions
Corrosion protection

TRASCO® Couplings

TRASCO® coupling is the flexible and omocinetic coupling that assures the best performance in relation to the physical space occupied in its class. It has a very compact design and allows safe power transmission by absorbing peak loads and torsional vibrations. Moreover, the elastic design of the polyurethane gear ring compensates for angular and radial misalignments and also absorbs small shaft length variation.

Features

Absorbs torsional vibrations
Compensates for axial, radial and angular misalignments
Available in cast iron, aluminum, steel and for taper bush mounting SER-SIT®
Available on request certified couplings according to ATEX directive 2014/34/EU

TRASCO® couplings available execution

GR executionBase program

GRB executionFor mounting taper bushing SER-SIT®

GR CAL executionFor mounting SIT-LOCK® CAL 8 locking elements

GRL executionWith intermediate shaft

GRLCAL3 executionWith intermediate shaft for mounting SIT-LOCK® CAL 3 locking elements

GRF executionWith flanges

GRFC executionCompact flange

GRS executionDouble cardanic

GRFRT executionFor drum brake

GRFRD executionFor brake disc

SITEX® couplings

SITEX® toothed couplings consist of two toothed steel hubs, which are connected with one internally toothed sleeve manufactured from stabilized 6.6 super polyamide resin.

SITEX® NYLEX® couplings are made of 100% Polyamide. Designed for light applications, low cost and available with finished bore keyway and thread for set screw.

The SITEX® FL couplings are designed to optimize the connections between Diesel engines and driven equipment such as hydraulic pumps.

Features

Maintenance free
Compact, easy assembling
SITEX® FL execution is used in connections between the flywheels of the internal combustion engines
NYLEX® execution design with polyamide hubs for light-duty applications.
Available on request certified couplings according to ATEX directive 2014/34/EU

Nylon and Flange executions

SITEX® NYLEX®Made of 100% Polyamide.

SITEX® FLFiberglass reinforced polyamide flange

ESAPLUS® elastic couplings

ESAPLUS® couplings are made of one elastic element made of pre-compressed, natural rubber, reinforced with steel to be fitted with fixing screws and a metallic band (to be removed after mounting) and two metallic hubs made of forged steel (size 120 produced in cast iron).

They are also available for mounting with SER-SIT® taper bushing from size 4 to 25; solid hub from size 35 to 120.

Features

an excellent dampening effect of the load peaks
high safety factor and a very high resistance to alternating deformation, thanks to pre-compression
possibility of bearing misalignment values rarely possible with other couplings

Brass couplings

Hubs made in brass and spider in rubber. Suitable for low power.

Bolt Couplings

The bolt coupling is a rigid coupling. It is made of two halves, which are cast iron grade GG25 connected by means of bolts. It is maintenance and lubrication free. Additionally, its construction prevents fretting corrosion and allows for easy mounting and dismounting.

The bolt coupling is designed to connect horizontal shafts with similar diameters. If different application, contact our technical department.

Universal Joints

High precision universal joint, complying according with DIN 808/7551.

Every execution is made by 2 hubs with forks and a central block.

Between pins and bores there are:

P series: 4 bearings with solid pins
E series: with sliding bushes
H series: with needle roller bearings

In the central blocks of P and E series there are the holes for the lubrication.

For the H series (high-speed applications) no lubrication is needed, because the roller bearing are maintenance free.

P series joints is designed for high precision and lifetime applications.

Every execution can be supply with extensible shaft.

Universal joint available executions

P executionHigh precision

E SeriesWith sliding bushes

H SeriesWith roller bearings

X SeriesStainless steel joints

Special ExecutionsCustom Joints

M SeriesProtection muffs, special neoprene rubber

HRC couplings

HRC Couplings are very compact and allow safe transmission of motion between the engine and driven machine, absorbing shocks and torsional vibrations.
HRC Couplings compensate for radial, angular and axial misalignments.

Features

Absorbs torsional vibrations
Compensates for axial, radial and angular misalignments

SIT Locking Devices

Locking Devices connect hubs solidly to shafts.

SIT-LOCK® Keyless Locking Devices

The SIT-LOCK® keyless locking devices produced by SIT S.p.A. for more than 30 years are ideal for any shaft-hub connection application.

SIT-LOCK® units are suitable to connect any type of hub (flywheels, pulleys, chain wheels, gears, levers, eccentrics, couplings, etc.) and can be utilized in a varied range of industrial applications.

Also available the new MONOBLOCK SIT-LOCK® 30 for shaft-hub connection! Easy, fast, MONOBLOCK!

Features

Help reduce the costs of the assembly
Ideal for next-generation applications
High axial and angular positioning accuracy
Ideal for applications involving acceleration and deceleration
Zero backlash
Easy to mount
Simultaneous loads possible
Calculation ease

Keyless Locking Devices SIT-LOCK® available executions

SIT-LOCK® 3Self-centering

SIT-LOCK® 4Self-centering

SIT-LOCK® 4ASelf-centering

SIT-LOCK® 4CSelf-centering

SIT-LOCK® 5ASelf-centering

SIT-LOCK® 5BSelf-centering

SIT-LOCK® 6Self-centering

SIT-LOCK® 7Self-centering

SIT-LOCK® 8Self-centering

SIT-LOCK® 12Self-centering

SIT-LOCK® 15Self-centering

SIT-LOCK® 16Self-centering

SIT-LOCK® 18Self-centering

SIT-LOCK® 13Self-centering

SIT-LOCK® 1Not self-centering

SIT-LOCK® 9Not self-centering

SIT-LOCK® 2Not self-centering

SIT-LOCK® 10External Rigid Shaft Coupling

SIT-LOCK® 11External

SIT-LOCK® 14External

MONOLOCK SIT-LOCK® 30

Self-Locking Bushing SERLOCK®

SERLOCK® is the innovative and patented locking device, joining Taper Bushing versatility with common self-locking unit advantages. Is directly interchangeable with SER-SIT® or T/L tapered bushings.

Suitable for taper bores 1108, 1210, 1610, 2012, 2517 and 3020. With bore diameters from 12 to 70 mm.

Features

Zero backlash
Quick and easy to mount
Eliminate the cost of additional machining

SER-SIT® taper bushing

SER-SIT® taper bushing is designed to give the following features.

Features

Rapid dismantling of the pulley and other transmission equipment;
No special tools requirement except hexagonal key.

SIT Bearing Units and Rod Ends

SIT S.p.A. offers a vast range of self-aligning steerable monoblock bearing units and ball joints and connecting rod ends. Bearing units available in the series: cast iron, stamped sheet metal, silver, stainless silver and stainless steel.

Bearing Units and Rod Ends ASAHI®

ASAHI® Japanese-manufactured bearing units are used in various application sectors. The monoblock bearing units are produced with an exclusive locking pin that enables self-alignment and prevents the rotation of the outer ring, thereby increasing the useful life of the installation.

The range is one of the largest in the world and includes bearing units with cast iron, stainless steel and stamped sheet metal bodies.

Bearing units are available designed for the insertion of a protective cap and for high-temperature applications and very high radial loads.

Features

Wide load range
Ball bearing extremely long operating life
Very good ball bearing protection (double seal)
High mechanical resistance
Easy and safe locking on shaft
Local temper on sliding ball rail
System preventing rotation of inside ball bearing ring on the shaft
Easy positioning during assembly

ASAHI® ball bearings Units and connecting rod ends are available with bronze, Teflon or steel-on-steel inserts

Bearing Units and Rod Ends ASAHI®

Cast iron Body Version

Sheet Metal - Stamped Version

Stainless Steel Version

Silver e Silver Stainless Version

Joinbal® ASAHI® Ball joints and rod ends

Plastic Bearing Units

SIT offers a vast range of plastic bearing units in order to cover the widest range of uses in the industrial field.

Features

Corpo esterno supporto in PBT
Cuscinetto in acciaio inox SUC420
Guarnizioni anteriori e posteriori inox
Ingrassatore per la rilubrificazione
Grani di bloccaggio per una maggiore tenuta
Fori di fissaggio intercambiabili con serie leggera

Features

Grande forza
Elevata resistenza a temperature di esercizio continuo
Ottima resistenza allo snervamento, anche alle alte temperature
Grande rigidità e durezza
Ottima proprietà di resistenza all’abrasione
Elevata stabilità dimensionale
Ottima resistenza agli agenti chimici e atmosferici

ESBAL® Rod Ends, Spherical Bearings and Articulations

SIT offers a vast range of ball joints, spherical terminals and spherical joints in order to cover the widest range of uses in the industrial field. ESBAL® spherical joints are used everywhere it is necessary to transmit movement between elements that have variable angles between them, in the case of levers, drives, hydraulic or pneumatic cylinders. These elements are in wide, general use, enabling a reduction of construction costs and aiding mounting in all cases where a system’s mechanical parts are subject to variable geometries or rotary motion at limited speed.

Features

High safety
High misalignment angle
High load admissible
Long operating life

Nidec® Servo Reducers

Inline Coaxial Epicycloidal Reducers

Nidec® Planetary Gearboxes VR series show excellent versatility combined with very high quality; certified by a manufacturing process that includes constant checks of each component, and final tests of the complete product for angular backlash, noise, back-drive resistance and slip resistance. Through the use of software optimized helical gearing, a superior tooth hardening process, and extremely close machining tolerances, we can offer an optimum power density which will satisfy the highest dynamic and precision requirements. Nidec® gearboxes are interchangeable with most of the gearboxes on the market.

Inline Coaxial Epicycloidal Reducers

VRL SeriesReliability, complete product range

VRB SeriesPrecision, easy mounting by square flange

VRS SeriesHigh precision, versatility and high radial and axial load

VRT SeriesCompact design, extreme performance with ISO flange

PRE/PRF SeriesLow noise, low vibration

Washdown SeriesOptional features for food or washdown environments

Right-angle Planetary Gearboxes

Inline Coaxial Epicycloidal Reducers

VRL SeriesReliability, complete product range

VRB SeriesPrecision, easy mounting by square flange

VRS SeriesHigh precision, versatility and high radial and axial load

VRT SeriesCompact design, extreme performance with ISO flange

PRE/PRF SeriesLow noise, low vibration

Washdown SeriesOptional features for food or washdown environments

Right-angle Worm Gearboxes

Hollow shaft with globoidal worm able to absorb strong shock and ensure high positioning accuracy.

Nidec® FlexWave Reducer

Nidec® has had a long and storied history supplying the leading robotics and machine tool manufacturers in Japan.

The Nidec® FlexWave is a very compact reduction mechanism that achieves zero backlash, as well as exceptional accuracy and repeatability. The FlexWave consists of three major internal elements – the elliptical wave generator subassembly, the flexible cup gear, and the inner ring gear. The elasticity properties of the cup gear and the teeth differential between the cup gear and the inner ring gear result in the unique reduction characteristics. When compared to other reduction technologies, the FlexWave offers the following advantages;

Near Zero backlash
High reduction ratios in a compact footprint
Exceptional repeatability
Extremely light weight

These characteristics enable the FlexWave to be the superior choice when sizing and selecting the proper reduction technology for robotics, medical equipment, semiconductor and circuit manufacturing, machine tools or any assembly automation applications requiring fine positioning.

Kinex Reducers

KINEX – is a smooth and quiet high precision cycloidal reducer for large size applications specially designed for the requirements of the automation industry.
It Provides” excellent movement“ for various applications, such as robots and machine tools.
We are able to provide the most suitable specification for a variety of applications:

Articulated Robot
Positioner
Wafer-transfer Robot
Lathe Turret Head
Automatic Tool Changer
Semiconductor manufacturing equipment
Intex Table

Features

High Accuracy
High Rigidity
Low Noise

Rotary and indexing

Nidec® first developed its STH off-set hollow bore rotary gearbox for a variety of robotic handling applications that were commonly encountered within the semiconductor industry. These OEM customers often wanted to apply the STH to a tooling fixture, end-effector, dial, etc., within their custom equipment. Nidec® quickly expanded the variety of ratios supported for the series and the configurations available at the input side, in order to provide more flexibility and options for these turn-key projects.

Nidec® has expanded its indexing product offering with the STR, to handle those applications that require larger overall torque carrying capacity with even finer levels of precision.

Rotary and indexing

STH SeriesHigh moment load with high-precision

STR SeriesZero backlash

High Precision Rack and Pinion

By shrinking the pinion with helical teeth, hardened and ground, through advanced technologies, or with SIT-LOCK® locking devices, we are able to propose a system of power transmission that is compact and quiet.

Thanks to precise mating pinion racks with helical teeth hardened and ground, made in different materials and heat treatments designed for every technical application, we are able to meet the increasingly high demands in terms of dynamics and precision.

Hypoid Reducer

Hypoid Gearboxes
For more information contact our Technical Dept.

SIT Power Transmission Accessories

Drive regulation

Locking Devices

SIT Flanges

SIT Clamp plates

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