TECHNICAL / INDEX
SK DRILL CHART
FRACTION SIZE
# SIZE
LETTER SIZE
METRIC SIZE
DECIMAL INCHES
SK6 COLLETS
SK10 COLLETS
SK13 COLLETS
SK16 COLLETS
SK20 COLLETS
SK25 COLLETS
80 79 78 77 76 75 74 73 72 71 70 69
0.0135 0.0145 0.0156 0.0160 0.0180 0.0197 0.0200 0.0210 0.0225 0.0240 0.0250 0.0260 0.0280 0.0292 0.0310 0.0312 0.0320 0.0330 0.0350 0.0360 0.0370 0.0380 0.0390 0.0394 0.0400 0.0410 0.0420 0.0430 0.0465 0.0469 0.0520 0.0550 0.0591 0.0595 0.0625 0.0635 0.0670 0.0700 0.0730 0.0760 0.0781 0.0785 0.0787 0.0810 0.0820 0.0860
1/64
0.5
SK6-0.8 SK6-0.8 SK6-0.8 SK6-0.8 SK6-0.8
0.75 0.0295
68
1/32
67 66 65 64 63 62 61 60 59 58 57 56
SK6-1 SK6-1 SK6-1 SK6-1 SK6-1 SK6-1
SK10-1 SK10-1 SK10-1 SK10-1 SK10-1 SK10-1
1
SK6-1.25 SK6-1.25 SK6-1.25 SK6-1.5 SK6-1.5 SK6-1.5 SK6-1.75 SK6-1.75 SK6-1.75 SK6-1.75
SK10-1.25 SK10-1.25 SK10-1.25 SK10-1.5 SK10-1.5 SK10-1.5 SK10-1.75 SK10-1.75 SK10-1.75 SK10-1.75
3/64
1.25 0.0492
55 54
1.5
53
1/16
52 51 50 49 48
1.75 0.0689
SK6-2 SK6-2 SK6-2 SK6-2 SK6-2 SK6-2
SK10-2 SK10-2 SK10-2 SK10-2 SK10-2 SK10-2
5/64
47
2
46 45 44
SK6-2.25 SK6-2.25 SK6-2.25
SK10-2.25 SK10-2.25 SK10-2.25
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