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SIT TRASCO ES Zero-Backlash Couplings

SIT TRASCO ES are torsionally flexible, puncture-proof shaft couplings with two metal hubs with front claws and a polyurethane element. They transmit torque through a high-precision pressure-stressed elastic star-shaped buffer which absorbs shock and torsional vibration. This element is oil, chemicals and heat resistant and electrically conductive. The elastic elements are available in different colors according to their hardness. The hubs are manufactured with minimal backlash so that the flexible elements are very tightly inserted into the front teeth to make a so-called zero-backlash coupling. Hubs are made of steel or aluminium alloy as unbored, with finished H7 bore, with a clamping joint and tightening screw or with an integrated clamping tapered element with a finished bore.

TRASCO ES couplings can be used for both directions of rotation and each mounting position.

SIT TRASCO ES GESP Hubs (Unbored) - Preview

GESP (Unbored Hubs)

SIT TRASCO ES GESP
Coupling components in unbored design
Coupling size: 7 - 75
Maximum bore: up to 95 mm
SIT TRASCO ES GESF Hubs (Finished Bore) - Preview

GESF (Finished Bore Hubs)

SIT TRASCO ES GESF
Coupling components with finished H7 bore and keyway according to DIN 6885
Coupling size: 7 - 75
Bore diameter: up to 95 mm
SIT TRASCO ES GESM Hubs (Clamping) - Preview

GESM (Clamping Hubs)

SIT TRASCO ES GESM
Coupling components with a clamping joint and tightening screw
Coupling size: 7 - 75
Bore diameter: up to 80 mm
SIT TRASCO ES GESMC Hubs (Compact Clamping) - Preview

GESMC (Compact Clamping Hubs)

SIT TRASCO ES GESMC
Coupling components with a clamping joint and tightening screw
Coupling size: 7 - 45
Bore diameter: up to 45 mm
SIT TRASCO ES GESA Hubs (Shrink) - Preview

GESA (Shrink Hubs)

SIT TRASCO ES GESA
Coupling components with an integrated clamping tapered element with a finished bore
Coupling size: 14 - 65
Bore diameter: up to 70 mm
SIT TRASCO ES GESAP Hubs (Shrink) - Preview

GESAP (Shrink Hubs, Steel, DIN 69002)

SIT TRASCO ES GESAP
Coupling components with an integrated clamping tapered element with a finished bore
Coupling size: 14 - 55
Bore diameter: up to 50 mm
SIT TRASCO ES GESS Spacers (Double Shaft) - Preview

GESS (Double Shaft Spacers)

SIT TRASCO ES GESS
Komponenty spojek pro spojky TRASCO ES 7‐65
Maximální díra: do 80 mm
SIT TRASCO ES Elastic Elements - Preview

AES (Elastic Elements)

SIT TRASCO ES AES
Coupling components of various sizes and hardness

Couplings Fields of Use

SIT TRASCO ES zero-backlash elastic couplings are intended for the highest demands in a wide range of industries where the highest precision and minimum backlash are required.

They are used, for example, in machine tools, testing machines, fine mechanics, dynamometers and many other applications, particularly in the food, chemical, paper, metalworking and automotive industries.

Couplings Characteristics

  • Torque transmission without backlash
  • Vibration damping from the motor shaft (up to 80%)
  • Easy and quick installation
  • Couplings are resistant to oil, chemicals and high temperature
  • Small size, low moment of inertia

Documents for Download

TRASCO ES Zero Backlash Couplings - Preview

TRASCO ES Zero Backlash Couplings

SIT Catalogue

English (PDF 1.41 MB)


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We also provide design and calculation of transmission components, including shaft couplings. In the case of your interest in this service, use the detailed Transmission Drive Design Form.


Shaft Coupling Manufacturer Profile

logo SIT

The group SIT S.p.A 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. With operations on 3 continents, SIT manufactures pulleys, rubber and polyurethane belts, drive couplings, locking assemblies and a wide range of accessories.

SIT belongs to a large industrial group that dates as far back as 1838. Today, thanks to over 50 years of specific experience in power transmission and a close-knit team of highly qualified professionals, the Group engages in constant technological innovation in order to offer the best application solutions in mechanical power drives.

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