SK 是業界通行的快換夾頭形式，橡膠層受壓後往內收攏夾住工件外徑，夾持面是一整圈而不是三個點，圓度與同心度比三爪穩定得多。拉入式（pull-back type）夾緊時工件會被往主軸方向帶一小段，所以軸向定位靠的是端面靠死 —— 需要嚴格軸向位置的工件要留意這一點。
40-120 mm，下限再提高到 40 mm，轉速上限 4,000 rpm。本款夾持範圍 40-120 mm；夾持力 140 kN；最高轉速 4,000 rpm；B 250 mm；E 64 mm。
Mongtec Precision 為台灣品牌，台中設計製造。
| 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 |
| 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 |
英文版：English version · SK120(W)（同尺寸） · 全部型號 · 快換夾治具總覽