SIT TRASCO ES GESM Hubs (Clamping)
GESM clamping hubs are parts designed for SIT TRASCO ES zero-backlash shaft couplings. They are sometimes called GES M series TRASCO ES hubs.
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. 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. These GESM hubs are made of steel or aluminium alloy with a clamping joint and tightening screw.
Products are sorted by name in ascending order.
TRASCO ES 7 GESM (GESM7F3) - Hub (d = 3F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.03€ excl. VAT
13.34€ incl. VAT
TRASCO ES 7 GESM (GESM7F4) - Hub (d = 4F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.03€ excl. VAT
13.34€ incl. VAT
TRASCO ES 7 GESM (GESM7F5) - Hub (d = 5F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.03€ excl. VAT
13.34€ incl. VAT
TRASCO ES 7 GESM (GESM7F6) - Hub (d = 6F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.03€ excl. VAT
13.34€ incl. VAT
TRASCO ES 7 GESM (GESM7F7) - Hub (d = 7F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.03€ excl. VAT
13.34€ incl. VAT
TRASCO ES 9 GESM (GESM9F10) - Hub (d = 10F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.07€ excl. VAT
13.39€ incl. VAT
TRASCO ES 9 GESM (GESM9F10C) - Hub (d = 10F7, with Keyway, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
Price on Request The shaft coupling price is calculated after receiving information about up-to-date prices from our suppliers. Please, fill in your email address and the required number of pieces and submit the form on the product page. The price and delivery conditions will be answered by email.
TRASCO ES 9 GESM (GESM9F3) - Hub (d = 3F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.07€ excl. VAT
13.39€ incl. VAT
TRASCO ES 9 GESM (GESM9F4) - Hub (d = 4F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.07€ excl. VAT
13.39€ incl. VAT
TRASCO ES 9 GESM (GESM9F5) - Hub (d = 5F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.07€ excl. VAT
13.39€ incl. VAT
TRASCO ES 9 GESM (GESM9F6) - Hub (d = 6F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.07€ excl. VAT
13.39€ incl. VAT
TRASCO ES 9 GESM (GESM9F6.35) - Hub (d = 6,35F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.07€ excl. VAT
13.39€ incl. VAT
TRASCO ES 9 GESM (GESM9F6C) - Hub (d = 6F7, with Keyway, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
Price on Request The shaft coupling price is calculated after receiving information about up-to-date prices from our suppliers. Please, fill in your email address and the required number of pieces and submit the form on the product page. The price and delivery conditions will be answered by email.
TRASCO ES 9 GESM (GESM9F8) - Hub (d = 8F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.07€ excl. VAT
13.39€ incl. VAT
TRASCO ES 9 GESM (GESM9F8C) - Hub (d = 8F7, with Keyway, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
Price on Request The shaft coupling price is calculated after receiving information about up-to-date prices from our suppliers. Please, fill in your email address and the required number of pieces and submit the form on the product page. The price and delivery conditions will be answered by email.
TRASCO ES 9 GESM (GESM9F9) - Hub (d = 9F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.07€ excl. VAT
13.39€ incl. VAT
TRASCO ES 9 GESM (GESM9F9C) - Hub (d = 9F7, with Keyway, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
Price on Request The shaft coupling price is calculated after receiving information about up-to-date prices from our suppliers. Please, fill in your email address and the required number of pieces and submit the form on the product page. The price and delivery conditions will be answered by email.
TRASCO ES 12 GESM (GESM12F10) - Hub (d = 10F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.58€ excl. VAT
14.02€ incl. VAT
TRASCO ES 12 GESM (GESM12F11) - Hub (d = 11F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.58€ excl. VAT
14.02€ incl. VAT
TRASCO ES 12 GESM (GESM12F12) - Hub (d = 12F7, Al Alloy)
Shaft Coupling
At Supplier
Within 3 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.58€ excl. VAT
14.02€ incl. VAT
Products are sorted by name in ascending order.
Shaft Coupling Construction
- GESM clamping hubs with a clamping joint and tightening screw
- Elastic star-shaped element
Typical Applications
SIT TRASCO ES zero-backlash elastic couplings with GESM hubs 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.
Properties
- 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
Coupling Code Description
Example:
TRASCO ES 9 GESM - Hub (d = 3F7, Al Alloy)
| Code Part | Description |
|---|---|
| TRASCO ES |
SIT couplings type |
| 9 |
Coupling size designation |
| GESM |
Hub type |
| Hub |
Part name |
| d = 3F7 |
Finished hole diameter in mm and tolerance |
| Al Alloy |
Hub material |
Documents for Download
Related Products
SIT TRASCO ES GESMC Hubs (Compact Clamping)
SIT TRASCO ES GESA Hubs (Shrink)
SIT TRASCO ES GESS Spacers (Double Shaft)
We also provide design and calculation of transmission components, including shaft couplings. In the case of your interest in this service, use the detailed Drive or Coupling Calculation Form.
Shaft Coupling Manufacturer Profile
SIT S.p.A. is a company focused on mechanical power transmission (SIT stands for Società Italiana Trasmissioni, meaning Italian Power Transmission Company). Under the SIT brand, it develops, engineers, manufactures, and distributes high-quality solutions and components for industrial applications across a wide range of sectors – from automotive and precision engineering to the food and textile industries, as well as chemical plants and logistics centers.
Together with Elatech S.r.l. and other companies, SIT S.p.A. is part of the Scaglia Group. The Group operates in Europe, North America, and Asia, and comprises 7 manufacturing facilities and 6 subsidiaries with more than 1,000 employees. As part of the Group, the individual companies benefit from shared technologies and innovations, providing financial stability and sustainable growth.
We are an authorized distributor of shaft couplings, bushes, sprockets, and pulleys from SIT S.p.A., as well as polyurethane timing belts and conveyor belts from Elatech S.r.l.