HSK - THERMAL SHRINK HOLDER Taper SizeHSK-A 63 A ➚ A .00012 50-52 HRc Ra 4µin N5 G2.5 Lmax 25,000 RPM Lmin4˚ HSK dD D1 J L2 L1 L Designation d D D1 L L1 L2 Lmin Lmax J Hex Key* HSK A 63 SRK1/8 X2.000 .125 .390 .699 3.024 2.000 - .394 .630 M6 3 HSK A 63 SRK1/8 X3.250 .125 .390 .823 4.274 3.250 3.098 .394 .630 M6 3 HSK A 63 SRK3/16X2.000 .187 .390 .699 3.024 2.000 - .590 .826 M6 3 HSK A 63 SRK3/16X3.250 .187 .390 .823 4.274 3.250 3.098 .590 .826 M6 3 HSK A 63 SRK1/4 X2.000 .250 .430 .699 3.024 2.000 - .709 .945 M8 4 HSK A 63 SRK1/4 X3.250 .250 .430 .823 4.274 3.250 3.098 .709 .945 M8 4 HSK A 63 SRK5/16X2.000 .312 .550 .709 3.024 2.000 - .984 1.417 M6 3 HSK A 63 SRK5/16X3.250 .312 .550 .866 4.274 3.250 3.098 .984 1.417 M6 3 HSK A 63 SRK3/8 X2.000 .375 .630 .787 3.024 2.000 1.693 1.181 1.614 M8 4 HSK A 63 SRK3/8 X3.250 .375 .630 .906 4.274 3.250 2.535 1.181 1.614 M8 4 HSK A 63 SRK7/16X2.000 .437 .790 .906 3.024 2.000 - 1.220 1.654 M8 4 HSK A 63 SRK7/16X3.250 .437 .790 1.024 4.274 3.250 2.815 1.220 1.654 M10 5 HSK A 63 SRK1/2 X2.000 .500 .790 1.063 3.024 2.000 - 1.260 1.693 M8 4 HSK A 63 SRK1/2 X3.250 .500 .790 1.181 4.274 3.250 2.815 1.260 1.693 M10 5 * Metric 761