| Model | SK120 |
|---|---|
| Series | SK |
| Type | SK series rubber clamping fixture (pull-back type) |
| Clamping range | 40-120 mm |
| Clamping force | 140 kN |
| B | 250 mm |
| C | 171 mm |
| E | 64 mm |
| F | 47.5 mm |
| Thread S | M80*2.0 |
| Max speed | 4,000 rpm |
| Run-out | ≤ 0.01 mm |
| Hardness | HRC 58-62 (bulk carburized, quenched, cryogenic treated) |
| Spindle connection | Flange matched to your spindle nose — specify machine at RFQ |
| Brand | Mongtec Precision Inc. — Taiwanese brand, designed and engineered in Taichung, Taiwan |
Source: Mongtec Quick Change Collet Chucks catalogue, Ver 2026.
SK120 clamps the part on its outside diameter. The clamping element is a segmented rubber-vulcanized module: the segments are ground as one piece and then split, so every segment seats fully on the workpiece instead of contacting on three points. That is what holds run-out at ≤ 0.01 mm while still accepting ±0.5 mm of part-to-part variation.
The wide acceptance band is the reason this style of fixture suits automatic loading — a bar-fed or robot-loaded part that lands slightly off nominal is still clamped concentrically, where a conventional three-jaw or spring collet would either miss or clamp off-centre.
Removing the positioning block leaves a through-hole, so the same fixture also runs bar work.
The clamping module is replaced without taking the fixture off the spindle. Changing the part size means changing the module, not re-setting the fixture — which is where the time is saved on short runs and mixed batches.
| Model | Clamping range | Clamping force | Max speed |
|---|---|---|---|
| SK32 | 5-32 mm | 70 kN | 7,000 rpm |
| SK42 | 5-42 mm | 80 kN | 6,000 rpm |
| SK52 | 5-52 mm | 94 kN | 6,000 rpm |
| SK65 | 5-65 mm | 105 kN | 6,000 rpm |
| SK80 | 5-80 mm | 115 kN | 5,000 rpm |
| SK100 | 16-100 mm | 150 kN | 4,500 rpm |
| SK160 | 40-160 mm | 150 kN | 4,000 rpm |
SK120 covers a clamping range of 40-120 mm on the outside diameter. Within that range the clamping module absorbs up to ±0.5 mm of workpiece variation, which is what makes it suitable for automatic loading.
The fixture body is standard; the connection to your machine is made through a flange matched to your spindle nose. Tell Mongtec the machine and spindle nose and the correct flange is quoted with the fixture.
The rubber clamping module is replaced without removing the fixture from the spindle — a matter of seconds rather than a re-setup. Changing to a different clamping range means changing the module, not the fixture.
Send the machine and spindle nose, the part diameter you need to hold, and whether the parts are loaded by hand, bar feed or robot. Dimensioned drawings are supplied by email once the enquiry is open.
All quick-change clamping models · Quick-change clamping overview · All Mongtec article numbers