Spindle Collet Torque Specifications: ER11, ER16, ER20, and ER32 Nut Standards
Over-tightening an ER collet crushes the internal taper and increases runout, while under-tightening causes tool slippage. Here is the official calibrated torque table.
The Dangers of "Hand-Tightening" ER Collets
Most machinists use standard hook spanners and tighten collet nuts by feel. Studies show hand tightening frequently results in over-torquing by 150%, permanently distorting the precision collet slots and introducing 0.001" of eccentricity.
Official ER Collet Torque Standards
| Collet Standard | Standard Nut Torque (Nm) | Bearing Nut Torque (Nm) | Torque (ft-lb) | | :--- | :--- | :--- | :--- | | ER11 | 25 – 30 Nm | 30 Nm | 18 – 22 ft-lb | | ER16 | 55 – 60 Nm | 70 Nm | 40 – 44 ft-lb | | ER20 | 80 – 90 Nm | 100 Nm | 59 – 66 ft-lb | | ER25 | 100 – 110 Nm | 130 Nm | 74 – 81 ft-lb | | ER32 | 135 – 150 Nm | 170 Nm | 100 – 110 ft-lb |
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