ER - THERMAL SHRINK ER COLLET DIN 6499 A ➚ A .00012 58-60 HRc Ra 4µin 1450 psi Lmax Lmax Lmin Lmin 4˚ 4˚ d D D1 d D D1 J L1 J L1 L L ER.. SRK.. (1) ER.. SRK JET2.. Designation d L L1 Lmin Lmax D1 D J Hex Key(2) ER20 SRK 1/8X1.500 .125 1.500 .970 .394 .630 .530 .394 M6 3 ER20 SRK 1/8X2.500 .125 2.500 .970 .394 .630 .530 .394 M6 3 ER20 SRK 3/16X1.500 .187 1.500 .970 .590 .830 .530 .394 M6 3 ER20 SRK 3/16X2.500 .187 2.500 .970 .590 .830 .530 .394 M6 3 ER20 SRK 1/4X1.500 .250 1.500 1.140 .709 .950 .590 .433 M8 4 ER20 SRK 1/4X2.500 .250 2.500 1.310 .709 .950 .620 .433 M8 4 ER25 SRK 1/8X1.500 .125 1.500 1.110 .394 .630 .550 .394 M6 3 ER25 SRK 1/8X2.500 .125 2.500 1.710 .394 .630 .630 .394 M6 3 ER25 SRK 3/16X1.500 .187 1.500 1.110 .590 .830 .550 .394 M6 3 ER25 SRK 3/16X2.500 .187 2.500 1.710 .590 .830 .630 .394 M6 3 ER25 SRK 1/4X1.500 .250 1.500 1.140 .709 .950 .590 .433 M8 4 ER25 SRK 1/4X2.500 .250 2.500 1.900 .709 .950 .700 .433 M8 4 ER25 SRK 5/16X1.500 .313 1.500 1.080 .984 1.220 .710 .551 M10 5 ER25 SRK 5/16X2.500 .313 2.500 1.710 .984 1.220 .790 .551 M10 5 ER32 SRK 1/8X1.500 .125 1.500 1.100 .394 .630 .550 .394 M6 3 ER32 SRK 1/8X2.500 .125 2.500 2.000 .394 .630 .680 .394 M6 3 ER32 SRK 1/8X3.500 .125 3.500 3.000 .394 .630 .820 .394 M6 3 ER32 SRK 3/16X1.500 .187 1.500 1.110 .590 .830 .550 .394 M6 3 ER32 SRK 3/16X2.500 .187 2.500 1.900 .590 .830 .660 .394 M6 3 ER32 SRK 3/16X3.500 .187 3.500 2.900 .590 .830 .800 .394 M6 3 ER32 SRK 1/4X1.500 .250 1.500 1.140 .709 .950 .590 .433 M8 4 ER32 SRK 1/4X2.500 .250 2.500 1.910 .709 .965 .700 .433 M8 4 ER32 SRK 1/4X3.500 .250 3.500 2.900 .709 1.020 .840 .433 M8 4 ER32 SRK 5/16X1.500 .312 1.500 1.440 .984 1.220 .760 .551 M10 5 ER32 SRK 5/16X2.500 .312 2.500 1.910 .984 1.220 .820 .551 M10 5 ER32 SRK 5/16X3.500 .312 3.500 2.710 .984 1.220 .930 .551 M10 5 ER32 SRK 3/8X1.500 .375 1.500 1.460 1.181 1.380 .840 .629 M12 6 ER32 SRK 3/8X2.500 .375 2.500 1.900 1.181 1.420 .900 .629 M12 6 ER32 SRK 3/8X3.500 .375 3.500 2.120 1.181 1.420 .930 .629 M12 6 ER32 SRK 7/16X1.500 .437 1.500 1.110 1.220 1.420 .940 .787 M14 6 ER32 SRK 7/16X2.500 .437 2.500 1.110 1.220 1.460 .940 .787 M14 6 ER32 SRK 7/16X3.500 .437 3.500 1.110 1.220 1.460 .940 .787 M14 6 ER32 SRK 1/2X1.500 .500 1.500 1.100 1.260 1.460 .940 .787 M14 6 ER32 SRK 1/2X2.500 .500 2.500 1.100 1.260 1.500 .940 .787 M14 6 ER32 SRK 1/2X3.500 .500 3.500 1.410 1.260 1.500 .940 .787 M14 6 (1) For JET2 collet, add JET2 to the designation (i.e. ER20 SRK 1/8X1 JET2). (2) Metric 849