
Collets and Sleeves ER Single-Angle Standard Collets (ER Single-Angle Standard Collets continued) ER Collets • Inch ER16 ER20 ER25 ER32 ER40 D2 = .669 D2 = .827 D2 = 1.024 D2 = 1.299 D2 = 1.614 collet capacity collet capacity D1 L = 1.083 L = 1.240 L = 1.339 L = 1.575 L = 1.811 max inch 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. I56 WWW.WIDIA.COM Collets and Sleeves