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 9.0-10ER25 SPR .396-.43513/32 (.396-.435)10.0-11ER-EX* (single diameter spring collets) ER25 SPR .435-.474 7/16 (.435-.474) 11.0-12ER25 SPR .474-.5141/2 (.474-.514)12.0-13ER25 SPR .514-.55317/32 (.514-.553)13.0-14 DiameterDesignationDiameter(mm) ER25 SPR .553-.593 9/16 (.553-.593) 14.0-15ER25 SPR .593-.6325/8 (.593-.632)15.0-16ER32 SPR .080-.1203/32 (.080-.120)2- 3ER32 SPR .120-.1591/8 (.120-.159)3- 4ER32 SPR .159-.1993/16 (.159-.199)4- 5ER32 SPR .199-.2387/32 (.199-.238)5- 6ER32 SPR .238-.2781/4 (.238-.278)6- 7ER32 EX .125.125 (1/8)3.175ER32 EX .250.250 (1/4)6.350ER32 EX .312.312 (5/16)7.924ER32 EX .375.375 (3/8)9.525ER32 EX .500.500 (1/2)12.700ER32 EX .625.625 (5/8)15.875ER32 EX .750.750 (3/4)19.050 ER32 SPR .278-.317 5/16 (.278-.317) 7- 8ER32 SPR .317-.35611/32 (.317-.356)8- 9ER32 SPR .356-.3963/8 (.356-.3969-10ER32 SPR .396-.43513/32 (.396-.435)10-11ER32 SPR .435-.4747/16 (.435-.474)11-12ER32 SPR .474-.5141/2 (.474-.514)12-13ER32 SPR .514-.55317/32 (.514-.553)13-14ER40 EX .250.250 (1/4)6.350ER40 EX .312.312 (5/16)7.924ER40 EX .375.375 (3/8)9.525ER40 EX .500.500 (1/2)12.700ER40 EX .625.625 (5/8)15.875ER40 EX .750.750 (3/4)19.050ER40 EX .875.875 (7/8)22.225 ER32 SPR .553-.593 9/16 (.553-.593) 14-15ER32 SPR .593-.6325/8 (.593-.632)15-16ER32 SPR .632-.67121/32 (.632-.671)16-17ER40 EX 1.0001.00025.400* 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