Technical Information Shrink Fit Shrink Fit (continued) Straight shank toolholder extensions are a great complement to the Shrink Fit system. Use caution and do not overheat Slim Line products. Overheating can cause warping or other permanent damage. Toolholder life drastically reduces if activating heat is not properly controlled. Cutting Tool Requirements metric (ISO standard) inch (industry standard) cutting tool shank diameters tolerance cucutttitninggttoooollsshhaank diaammeetteerrss ttolerraannccee 3mm 2,997 3,000 h4 0.000/-0.003 1/8 .1249 .1247 -0.0001/-0.0003 4mm 3,996 4,000 h4 0.000/-0.004 3/16 .1874 .1872 -0.0001/-0.0003 5mm 4,995 5,000 h5 0.000/-0.005 1/4 .2499 .2496 -0.0001/-0.0004 6mm 5,992 6,000 0.000/-0.008 5/16 .3124 .3121 -0.0001/-0.0004 8mm 7,991 8,000 0.000/-0.009 3/8 .3749 .3746 -0.0001/-0.0004 10mm 9,991 10,000 0.000/-0.009 7/16 .4375 .4371 0.0000/-0.0004 12mm 11,989 12,000 0.000/-0.011 1/2 .5000 .4996 0.0000/-0.0004 14mm 13,989 14,000 0.000/-0.011 9/16 .5625 .5621 0.0000/-0.0004 16mm 15,989 16,000 0.000/-0.011 5/8 .6250 .6246 0.0000/-0.0004 18mm 17,989 18,000 h6 0.000/-0.011 11/16 .6875 .6871 0.0000/-0.0004 20mm 19,987 20,000 0.000/-0.013 3/4 .7500 .7495 0.0000/-0.0005 25mm 24,987 25,000 0.000/-0.013 7/8 .8750 .8745 0.0000/-0.0005 32mm 31,984 32,000 0.000/-0.016 1 1.0000 .9995 0.0000/-0.0005 40mm 39,984 40,000 0.000/-0.016 1-1/4 1.2500 1.2495 0.0000/-0.0005 50mm 49,984 50,000 0.000/-0.003 1-1/2 1.5000 1.4995 0.0000/-0.0005 2 2.0000 1.9995 0.0000/-0.0005 K58 WWW.WIDIA.COM Technical Information