TECHNICAL / INDEX
SK DRILL CHART
FRACTION SIZE
# SIZE
LETTER SIZE
METRIC SIZE
DECIMAL INCHES
SK6 COLLETS SK6-2.25 SK6-2.5 SK6-2.5 SK6-2.5 SK6-2.5 SK6-2.5 SK6-2.5 SK6-2.75 SK6-2.75 SK6-2.75 SK6-2.75 SK6-2.75
SK10 COLLETS SK10-2.25 SK10-2.5 SK10-2.5 SK10-2.5 SK10-2.5 SK10-2.5 SK10-2.5 SK10-2.75 SK10-2.75 SK10-2.75 SK10-2.75 SK10-2.75
SK13 COLLETS
SK16 COLLETS
SK20 COLLETS
SK25 COLLETS
2.25 0.0886
43 42 41 40 39 38 37 36 35 34 33 32
0.0890 0.0935 0.0938 0.0960 0.0980 0.0984 0.0995 0.1015 0.1040 0.1065 0.1094 0.1100 0.1110 0.1130 0.1160 0.1181 0.1200 0.1285 0.1360 0.1378 0.1405 0.1406 0.1440 0.1470 0.1476 0.1495 0.1520 0.1540 0.1562 0.1570 0.1575 0.1590 0.1610 0.1660 0.1695 0.1719 0.1730 0.1770 0.1772 0.1800 0.1820 0.1850 0.1870
3/32
2.5
2.75 0.1083
SK16-3 SK16-3 SK16-3 SK16-3 SK16-3 SK16-3 SK16-3
7/64
SK6-3 SK6-3 SK6-3 SK6-3 SK6-3 SK6-3
SK10-3 SK10-3 SK10-3 SK10-3 SK10-3 SK10-3
SK13-3 SK13-3 SK13-3 SK13-3 SK13-3
3
31
SK6-3.5
SK10-3.5
SK13-3.5
SK16-3.5
1/8
0.1250 SK6-3.5/SK6-1/8A SK10-3.5/ SK10-1/8A SK13-3.5/SK13-1/8A SK16-3.5/ SK16-1/8A
SK20-1/8A
3.25 0.1280
SK6-3.5 SK6-3.5 SK6-3.5 SK6-3.5
SK10-3.5 SK10-3.5 SK10-3.5 SK10-3.5
SK13-3.5 SK13-3.5 SK13-3.5 SK13-3.5
SK16-3.5 SK16-3.5 SK16-3.5 SK16-3.5
30 29
3.5
28
SK6-4 SK6-4 SK6-4 SK6-4 SK6-4 SK6-4 SK6-4 SK6-4 SK6-4 SK6-4 SK6-4
SK10-4 SK10-4 SK10-4 SK10-4 SK10-4 SK10-4 SK10-4 SK10-4 SK10-4 SK10-4 SK10-4
SK13-4 SK13-4 SK13-4 SK13-4 SK13-4 SK13-4 SK13-4 SK13-4 SK13-4 SK13-4 SK13-4
SK16-4 SK16-4 SK16-4 SK16-4 SK16-4 SK16-4 SK16-4 SK16-4 SK16-4 SK16-4 SK16-4
SK20-4 SK20-4 SK20-4 SK20-4 SK20-4 SK20-4 SK20-4 SK20-4 SK20-4 SK20-4 SK20-4
9/64
27 26 25 24 23
3.75
5/32
22
4
21 20 19
SK6-4.5 SK6-4.5 SK6-4.5 SK6-4.5 SK6-4.5 SK6-4.5 SK6-4.5 SK6-4.5 SK6-4.5 SK6-5.0 SK6-5.0 SK6-5.0 SK6-5.0
SK10-4.5 SK10-4.5 SK10-4.5 SK10-4.5 SK10-4.5 SK10-4.5 SK10-4.5 SK10-4.5 SK10-4.5 SK10-5 SK10-5 SK10-5 SK10-5
SK13-4.5 SK13-4.5 SK13-4.5 SK13-4.5 SK13-4.5 SK13-4.5 SK13-4.5 SK13-4.5 SK13-4.5 SK13-5 SK13-5 SK13-5 SK13-5
SK16-4.5 SK16-4.5 SK16-4.5 SK16-4.5 SK16-4.5 SK16-4.5 SK16-4.5 SK16-4.5 SK16-4.5 SK16-5 SK16-5 SK16-5 SK16-5
SK20-4.5 SK20-4.5 SK20-4.5 SK20-4.5 SK20-4.5 SK20-4.5 SK20-4.5 SK20-4.5 SK20-4.5 SK20-5 SK20-5 SK20-5 SK20-5
4.25 0.1673
18
11/64
17 16 15 14 13
4.5
4.75
3/16
0.1875 SK6-5.0/SK6-3/16A SK10-5/ SK10-3/16A SK13-5/SK13-3/16A SK16-5/ SK16-3/16A SK20-5/ SK20-3/16A
SK25-3/16A
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