ER - SPRING COLLETS DIN 6499 46-48 HRc Ra 4µin ER-11, 16, 20, 25.32-SPR ER40, 50-SPR Diameter Diameter Diameter Diameter Designation Range Range (mm) Designation Range Range (mm) ER11 SPR .022-.041 1/32 (.022-.041) 0.5- 1 ER40 SPR .120-.159 1/8 (.120-.159) 3- 4 ER11 SPR .041-.080 1/16 (.041-.080) 1.0- 2 ER40 SPR .159-.199 3/16 (.159-.199) 4- 5 ER11 SPR .080-.120 3/32 (.080-.120) 2.0- 3 ER40 SPR .199-.238 7/32 (.199-.238) 5- 6 ER11 SPR .120-.159 1/8 (.120-.159) 3.0- 4 ER40 SPR .238-.278 1/4 (.238-.278) 6- 7 ER11 SPR .159-.199 3/16 (.159-.199) 4.0- 5 ER40 SPR .278-.317 5/16 (.278-.317) 7- 8 ER11 SPR .199-.238 7/32 (.199-.238) 5.0- 6 ER40 SPR .317-.356 11/32 (.317-.356) 8- 9 ER11 SPR .238-.278 1/4 (.238-.278) 6.0- 7 ER40 SPR .356-.396 3/8 (.356-.396 9-10 ER16 SPR .022-.041 1/32 (.022-.041) 0.5- 1 ER40 SPR .396-.435 13/32 (.396-.435) 10-11 ER16 SPR .041-.080 1/16 (.041-.080) 1.0- 2 ER40 SPR .435-.474 7/16 (.435-.474) 11-12 ER16 SPR .080-.120 3/32 (.080-.120) 2.0- 3 ER40 SPR .474-.514 1/2 (.474-.514) 12-13 ER16 SPR .120-.159 1/8 (.120-.159) 3.0- 4 ER40 SPR .514-.553 17/32 (.514-.553) 13-14 ER16 SPR .159-.199 3/16 (.159-.199) 4.0- 5 ER40 SPR .553-.593 9/16 (.553-.593) 14-15 ER16 SPR .199-.238 7/32 (.199-.238) 5.0- 6 ER40 SPR .593-.632 5/8 (.593-.632) 15-16 ER16 SPR .238-.278 1/4 (.238-.278) 6.0- 7 ER40 SPR .632-.671 21/32 (.632-.671) 16-17 ER16 SPR .278-.317 5/16 (.278-.317) 7.0- 8 ER40 SPR .671-.711 11/16 (.671-.711) 17-18 ER16 SPR .317-.356 11/32 (.317-.356) 8.0- 9 ER40 SPR .711-.750 3/4 (.711-.750) 18-19 ER16 SPR .356-.396 3/8 (.356-.396 9.0-10 ER40 SPR .750-.789 25/32 (.750-.789) 19-20 ER20 SPR .041-.080 1/16 (.041-.080) 1.0- 2 ER40 SPR .789-.829 13/16 (.789-.829) 20-21 ER20 SPR .080-.120 3/32 (.080-.120) 2.0- 3 ER40 SPR .829-.868 27/32 (.829-.868) 21-22 ER20 SPR .120-.159 1/8 (.120-.159) 3.0- 4 ER40 SPR .868-.907 7/8 (.868-.907) 22-23 ER20 SPR .159-.199 3/16 (.159-.199) 4.0- 5 ER40 SPR .907-.947 15/16 (.907-.947) 23-24 ER20 SPR .199-.238 7/32 (.199-.238) 5.0- 6 ER40 SPR .947-.986 31/32 (.947-.986) 24-25 ER20 SPR .238-.278 1/4 (.238-.278) 6.0- 7 ER40 SPR .986-1.025 1 (.986-1.025) 25-26 ER20 SPR .278-.317 5/16 (.278-.317) 7.0- 8 ER50 SPR .396-.474 13/32, 7/16 (.396-.474) 10-12 ER20 SPR .317-.356 11/32 (.317-.356) 8.0- 9 ER50 SPR .474-.553 1/2, 17/32 (.474-.553) 12-14 ER20 SPR .356-.396 3/8 (.356-.396 9.0-10 ER50 SPR .553-.632 9/16, 5/8 (.553-.632) 14-16 ER20 SPR .396-.435 13/32 (.396-.435) 10.0-11 ER50 SPR .632-.711 21/32, 11/16 (.632-.711) 16-18 ER20 SPR .435-.474 7/16 (.435-.474) 11.0-12 ER50 SPR .711-.789 3/4, 25/32 (.711-.789) 18-20 ER20 SPR .474-.514 1/2 (.474-.514) 12.0-13 ER50 SPR .789-.868 13/16, 27/32 (.789-.868) 20-22 ER25 SPR .041-.080 1/16 (.041-.080) 1.0- 2 ER50 SPR .868-.947 7/8, 15/16 (.868-.947) 22-24 ER25 SPR .080-.120 3/32 (.080-.120) 2.0- 3 ER50 SPR .947-1.025 31/32, 1 (.947-1.025) 24-26 ER25 SPR .120-.159 1/8 (.120-.159) 3.0- 4 ER50 SPR 1.025-1.102 1-1/16 (1.025-1.102) 26-28 ER25 SPR .159-.199 3/16 (.159-.199) 4.0- 5 ER50 SPR 1.102-1.181 1-1/8 (1.102-1.181) 28-30 ER25 SPR .199-.238 7/32 (.199-.238) 5.0- 6 ER50 SPR 1.181-1.260 1-1/4 (1.181-1.260) 30-32 ER25 SPR .238-.278 1/4 (.238-.278) 6.0- 7 ER50 SPR 1.260-1.338 1-5/16 (1.260-1.338) 32-34 ER25 SPR .278-.317 5/16 (.278-.317) 7.0- 8 ER25 SPR .317-.356 11/32 (.317-.356) 8.0- 9 ER25 SPR .356-.396 3/8 (.356-.396 9.0-10 ER25 SPR .396-.435 13/32 (.396-.435) 10.0-11 ER-EX* (single diameter spring collets) ER25 SPR .435-.474 7/16 (.435-.474) 11.0-12 Diameter ER25 SPR .474-.514 1/2 (.474-.514) 12.0-13 Designation Diameter (mm) ER25 SPR .514-.553 17/32 (.514-.553) 13.0-14 ER25 SPR .553-.593 9/16 (.553-.593) 14.0-15 ER32 EX .125 .125 (1/8) 3.175 ER25 SPR .593-.632 5/8 (.593-.632) 15.0-16 ER32 EX .250 .250 (1/4) 6.350 ER32 SPR .080-.120 3/32 (.080-.120) 2- 3 ER32 EX .312 .312 (5/16) 7.924 ER32 SPR .120-.159 1/8 (.120-.159) 3- 4 ER32 EX .375 .375 (3/8) 9.525 ER32 SPR .159-.199 3/16 (.159-.199) 4- 5 ER32 EX .500 .500 (1/2) 12.700 ER32 SPR .199-.238 7/32 (.199-.238) 5- 6 ER32 EX .625 .625 (5/8) 15.875 ER32 SPR .238-.278 1/4 (.238-.278) 6- 7 ER32 EX .750 .750 (3/4) 19.050 ER32 SPR .278-.317 5/16 (.278-.317) 7- 8 ER40 EX .250 .250 (1/4) 6.350 ER32 SPR .317-.356 11/32 (.317-.356) 8- 9 ER40 EX .312 .312 (5/16) 7.924 ER32 SPR .356-.396 3/8 (.356-.396 9-10 ER40 EX .375 .375 (3/8) 9.525 ER32 SPR .396-.435 13/32 (.396-.435) 10-11 ER40 EX .500 .500 (1/2) 12.700 ER32 SPR .435-.474 7/16 (.435-.474) 11-12 ER40 EX .625 .625 (5/8) 15.875 ER32 SPR .474-.514 1/2 (.474-.514) 12-13 ER40 EX .750 .750 (3/4) 19.050 ER32 SPR .514-.553 17/32 (.514-.553) 13-14 ER40 EX .875 .875 (7/8) 22.225 ER32 SPR .553-.593 9/16 (.553-.593) 14-15 ER40 EX 1.000 1.000 25.400 ER32 SPR .593-.632 5/8 (.593-.632) 15-16 ER32 SPR .632-.671 21/32 (.632-.671) 16-17 * Recommended for improved runout and clamping torque. ER32 SPR .671-.711 11/16 (.671-.711) 17-18 ER32 SPR .711-.750 3/4 (.711-.750) 18-19 ER32 SPR .750-.789 25/32 (.750-.789) 19-20 841