The TSF and TST are torque saver options mounted on CKD index drives. The release torque is set with an adjusting nut, and sizes range from TSF2 to TSF18 and TST6 to TST11.
| Size | TSF2 to TSF18 / TST6 to TST11 |
| Applicable Index Drive | RGIS, RGIL, PCIS (TSF) / RGIT (TST) |
| Release Torque Adjusting Range | 2.94 to 58.9 N·m (TSF5) / 100 to 600 N·m (TST11) |
| Allowable Thrust Force | 7850 N (TSF5) / 9500 N (TST11) |
| Allowable Radial Force | 3430 N (TSF5) / 3800 N (TST11) |
| Allowable Bending Moment | 147 N·m (TSF5) / 330 N·m (TST11) |
| Weight | 1.34 kg (TSF5) / 16.6 kg (TST11) |