TECHNICAL / INDEX
SK DRILL CHART
FRACTION SIZE
# SIZE
LETTER SIZE
METRIC SIZE
DECIMAL INCHES
SK6 COLLETS
SK10 COLLETS
SK13 COLLETS
SK16 COLLETS
SK20 COLLETS SK20-16.5 SK20-16.5 SK20-17 SK20-17 SK20-17.5 SK20-17.5 SK20-17.5 SK20-18 SK20-18 SK20-18.5 SK20-18.5 SK20-19 SK20-19 SK20-19.5 SK20-19.5 SK20-20 SK20-20
SK25 COLLETS SK25-16.5 SK25-16.5 SK25-17 SK25-17 SK25-17.5 SK25-17.5 SK25-17.5 SK25-18 SK25-18 SK25-18.5 SK25-18.5 SK25-19 SK25-19 SK25-19.5 SK25-19.5 SK25-20 SK25-20 SK25-20.5 SK25-20.5 SK25-21 SK25-21 SK25-21.5 SK25-21.5 SK25-21.5 SK25-22 SK25-22 SK25-22.5 SK25-23 SK25-23 SK25-23.5 SK25-23.5 SK25-23.5 SK25-24 SK25-24 SK25-24.5 SK25-24.5 SK25-25 SK25-25 SK25-25.4 SK25-25.4
41/64
0.6406
16.5 0.6496
21/32
0.6562 0.6693 0.6719 0.6875 0.7031 0.7087 0.7188 0.7344 0.7480 0.7500 0.7656 0.7677 0.7813 0.7874 0.7969 0.8125 0.8268 0.8281 0.8438 0.8594 0.8661 0.8750 0.8906 0.9055 0.9062 0.9219 0.9375 0.9449 0.9531 0.9688 0.9843 0.9844
17
43/64 11/16
17.5 0.6890
45/64
18
23/32
18.5 0.7283
47/64
19
3/4
SK20-19.5/ SK20-3/4A SK25-19.5/ SK25-3/4A
49/64
19.5
25/32
20
51/64
20.5 0.8071
13/16
21
53/64 27/32
21.5 0.8465
55/64
22
7/8
SK25-22.5/SK25-7/8A
22.5 0.8858
57/64
23
29/32 59/64
23.5 0.9252
15/16
24
61/64
24.5 0.9646
31/32
25
63/64
1
1
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