ER - SPRING COLLET DIN 6499 'AA' 46-48 HRc Ra 4µin Ultra Precision ‘AA’ ER11, 16, 20, 25-SPR-AA ER32, 40-SPR-AA Diameter Diameter Diameter Diameter Designation Range Range (mm) Designation Range Range (mm) ER11 SPR .022-.041 AA 1/32 (.022-.041) 0.5- 1 ER32 SPR .080-.120 AA 3/32 (.080-.120) 2- 3 ER11 SPR .041-.080 AA 1/16 (.041-.080) 1.0- 2 ER32 SPR .120-.159 AA 1/8 (.120-.159) 3- 4 ER11 SPR .080-.120 AA 3/32 (.080-.120) 2.0- 3 ER32 SPR .159-.199 AA 3/16 (.159-.199) 4- 5 ER11 SPR .120-.159 AA 1/8 (.120-.159) 3.0- 4 ER32 SPR .199-.238 AA 7/32 (.199-.238) 5- 6 ER11 SPR .159-.199 AA 3/16 (.159-.199) 4.0- 5 ER32 SPR .238-.278 AA 1/4 (.238-.278) 6- 7 ER11 SPR .199-.238 AA 7/32 (.199-.238) 5.0- 6 ER32 SPR .278-.317 AA 5/16 (.278-.317) 7- 8 ER11 SPR .238-.278 AA 1/4 (.238-.278) 6.0- 7 ER32 SPR .317-.356 AA 11/32 (.317-.356) 8- 9 ER16 SPR .022-.041 AA 1/32 (.022-.041) 0.5- 1 ER32 SPR .356-.396 AA 3/8 (.356-.396 9-10 ER16 SPR .041-.080 AA 1/16 (.041-.080) 1.0- 2 ER32 SPR .396-.435 AA 13/32 (.396-.435) 10-11 ER16 SPR .080-.120 AA 3/32 (.080-.120) 2.0- 3 ER32 SPR .435-.474 AA 7/16 (.435-.474) 11-12 ER16 SPR .120-.159 AA 1/8 (.120-.159) 3.0- 4 ER32 SPR .474-.514 AA 1/2 (.474-.514) 12-13 ER16 SPR .159-.199 AA 3/16 (.159-.199) 4.0- 5 ER32 SPR .514-.553 AA 17/32 (.514-.553) 13-14 ER16 SPR .199-.238 AA 7/32 (.199-.238) 5.0- 6 ER32 SPR .553-.593 AA 9/16 (.553-.593) 14-15 ER16 SPR .238-.278 AA 1/4 (.238-.278) 6.0- 7 ER32 SPR .593-.632 AA 5/8 (.593-.632) 15-16 ER16 SPR .278-.317 AA 5/16 (.278-.317) 7.0- 8 ER32 SPR .632-.671 AA 21/32 (.632-.671) 16-17 ER16 SPR .317-.356 AA 11/32 (.317-.356) 8.0- 9 ER32 SPR .671-.711 AA 11/16 (.671-.711) 17-18 ER16 SPR .356-.396 AA 3/8 (.356-.396 9.0-10 ER32 SPR .711-.750 AA 3/4 (.711-.750) 18-19 ER20 SPR .041-.080 AA 1/16 (.041-.080) 1.0- 2 ER32 SPR .750-.789 AA 25/32 (.750-.789) 19-20 ER20 SPR .080-.120 AA 3/32 (.080-.120) 2.0- 3 ER40 SPR .120-.159 AA 1/8 (.120-.159) 3- 4 ER20 SPR .120-.159 AA 1/8 (.120-.159) 3.0- 4 ER40 SPR .159-.199 AA 3/16 (.159-.199) 4- 5 ER20 SPR .159-.199 AA 3/16 (.159-.199) 4.0- 5 ER40 SPR .199-.238 AA 7/32 (.199-.238) 5- 6 ER20 SPR .199-.238 AA 7/32 (.199-.238) 5.0- 6 ER40 SPR .238-.278 AA 1/4 (.238-.278) 6- 7 ER20 SPR .238-.278 AA 1/4 (.238-.278) 6.0- 7 ER40 SPR .278-.317 AA 5/16 (.278-.317) 7- 8 ER20 SPR .278-.317 AA 5/16 (.278-.317) 7.0- 8 ER40 SPR .317-.356 AA 11/32 (.317-.356) 8- 9 ER20 SPR .317-.356 AA 11/32 (.317-.356) 8.0- 9 ER40 SPR .356-.396 AA 3/8 (.356-.396 9-10 ER20 SPR .356-.396 AA 3/8 (.356-.396 9.0-10 ER40 SPR .396-.435 AA 13/32 (.396-.435) 10-11 ER20 SPR .396-.435 AA 13/32 (.396-.435) 10.0-11 ER40 SPR .435-.474 AA 7/16 (.435-.474) 11-12 ER20 SPR .435-.474 AA 7/16 (.435-.474) 11.0-12 ER40 SPR .474-.514 AA 1/2 (.474-.514) 12-13 ER20 SPR .474-.514 AA 1/2 (.474-.514) 12.0-13 ER40 SPR .514-.553 AA 17/32 (.514-.553) 13-14 ER25 SPR .041-.080 AA 1/16 (.041-.080) 1-2 ER40 SPR .553-.593 AA 9/16 (.553-.593) 14-15 ER25 SPR .080-.120 AA 3/32 (.080-.120) 2-3 ER40 SPR .593-.632 AA 5/8 (.593-.632) 15-16 ER25 SPR .120-.159 AA 1/8 (.120-.159) 3-4 ER40 SPR .632-.671 AA 21/32 (.632-.671) 16-17 ER25 SPR .159-.199 AA 3/16 (.159-.199) 4-5 ER40 SPR .671-.711 AA 11/16 (.671-.711) 17-18 ER25 SPR .199-.238 AA 7/32 (.199-.238) 5-6 ER40 SPR .711-.750 AA 3/4 (.711-.750) 18-19 ER25 SPR .238-.278 AA 1/4 (.238-.278) 6-7 ER40 SPR .750-.789 AA 25/32 (.750-.789) 19-20 ER25 SPR .278-.317 AA 5/16 (.278-.317) 7-8 ER40 SPR .789-.829 AA 13/16 (.789-.829) 20-21 ER25 SPR .317-.356 AA 11/32 (.317-.356) 8-9 ER40 SPR .829-.868 AA 27/32 (.829-.868) 21-22 ER25 SPR .356-.396 AA 3/8 (.356-.396 9 -10 ER40 SPR .868-.907 AA 7/8 (.868-.907) 22-23 ER25 SPR .396-.435 AA 13/32 (.396-.435) 10 -11 ER40 SPR .907-.947 AA 15/16 (.907-.947) 23-24 ER25 SPR .435-.474 AA 7/16 (.435-.474) 11 -12 ER40 SPR .947-.986 AA 31/32 (.947-.986) 24-25 ER25 SPR .474-.514 AA 1/2 (.474-.514) 12 -13 ER40 SPR .986-1.025 AA 1 (.986-1.025) 25-26 ER25 SPR .514-.553 AA 17/32 (.514-.553) 13 -14 ER25 SPR .553-.593 AA 9/16 (.553-.593) 14 -15 ER25 SPR .593-.632 AA 5/8 (.593-.632) 15 -16 842