
(ER Single-Angle Standard Collets continued)
| D1 | ER16 D2 = .669 L = 1.083 | ER20 D2 = .827 L = 1.240 | ER25 D2 = 1.024 L = 1.339 | ER32 D2 = 1.299 L = 1.575 | ER40 D2 = 1.614 L = 1.811 | collet capacity max inch | collet capacity min inch |
| 1/16 | 16ER0062 | 20ER0062 | 25ER0062 | — | — | .0625 | .0425 |
| 3/32 | — | 20ER0094 | — | — | — | .0938 | .0538 |
| 3/32 | 16ER0094 | — | 25ER0094 | — | — | .0938 | .0738 |
| 1/8 | 16ER0125 | 20ER0125 | 25ER0125 | 32ER0125 | 40ER0125 | .1250 | .0850 |
| 5/32 | 16ER0156 | 20ER0156 | 25ER0156 | 32ER0156 | 40ER0156 | .1563 | .1163 |
| 3/16 | 16ER0188 | 20ER0188 | 25ER0188 | 32ER0188 | 40ER0188 | .1875 | .1475 |
| 7/32 | 16ER0219 | 20ER0219 | 25ER0219 | 32ER0219 | 40ER0219 | .2188 | .1788 |
| 1/4 | 16ER0250 | 20ER0250 | 25ER0250 | 32ER0250 | 40ER0250 | .2500 | .2100 |
| 9/32 | 16ER0281 | 20ER0281 | 25ER0281 | 32ER0281 | 40ER0281 | .2813 | .2413 |
| 5/16 | 16ER0312 | 20ER0312 | 25ER0312 | 32ER0312 | 40ER0312 | .3125 | .2725 |
| 11/32 | 16ER0344 | 20ER0344 | 25ER0344 | 32ER0344 | 40ER0344 | .3438 | .3038 |
| 3/8 | 16ER0375 | 20ER0375 | 25ER0375 | 32ER0375 | 40ER0375 | .3750 | .3350 |
| 13/32 | 16ER0406 | 20ER0406 | 25ER0406 | 32ER0406 | 40ER0406 | .4063 | .3663 |
| 7/16 | — | 20ER0438 | 25ER0438 | 32ER0438 | 40ER0438 | .4375 | .3975 |
| 15/32 | — | 20ER0469 | 25ER0469 | 32ER0469 | 40ER0469 | .4688 | .4288 |
| 1/2 | — | 20ER0500 | 25ER0500 | 32ER0500 | 40ER0500 | .5000 | .4600 |
| 17/32 | — | — | 25ER0531 | 32ER0531 | 40ER0531 | .5313 | .4913 |
| 9/16 | — | — | — | 32ER0562 | 40ER0562 | .5625 | .5225 |
| 9/16 | — | — | 25ER0562 | — | — | .5626 | .5225 |
| 19/32 | — | — | 25ER0594 | 32ER0594 | 40ER0594 | .5938 | .5538 |
| 5/8 | — | — | 25ER0625 | 32ER0625 | 40ER0625 | .6250 | .5850 |
| 21/32 | — | — | — | 32ER0656 | 40ER0656 | .6563 | .6163 |
| 11/16 | — | — | — | 32ER0688 | 40ER0688 | .6875 | .6475 |
| 23/32 | — | — | — | 32ER0719 | 40ER0719 | .7188 | .6788 |
| 3/4 | — | — | — | 32ER0750 | 40ER0750 | .7500 | .7100 |
| 25/32 | — | — | — | 32ER0781 | 40ER0781 | .7813 | .7413 |
| 13/16 | — | — | — | 32ER0812 | 40ER0812 | .8125 | .7725 |
| 27/32 | — | — | — | — | 40ER0844 | .8438 | .8038 |
| 7/8 | — | — | — | — | 40ER0875 | .8750 | .8350 |
| 29/32 | — | — | — | — | 40ER0906 | .9063 | .8663 |
| 15/16 | — | — | — | — | 40ER0938 | .9375 | .8975 |
| 31/32 | — | — | — | — | 40ER0969 | .9688 | .9288 |
| 1 | — | — | — | — | 40ER1000 | 1.0000 | .9600 |
NOTE: Inserting the cutting tool less than 2/3 the gripping length into the collet can permanently damage the collet. Full length of the gripping bore must be maintained to achieve maximum accuracy and safety. Collet accuracies are based on size-for-size conditions. Never try to stretch the collets by clamping oversized cutting tools.