TECHNICAL / INDEX
SK DRILL CHART
FRACTION SIZE
# SIZE
LETTER SIZE
METRIC SIZE
DECIMAL INCHES
SK6 COLLETS
SK10 COLLETS SK10-8.5 SK10-8.5 SK10-8.5
SK13 COLLETS SK13-8.5 SK13-8.5 SK13-8.5
SK16 COLLETS SK16-8.5 SK16-8.5 SK16-8.5
SK20 COLLETS SK20-8.5 SK20-8.5 SK20-8.5 SK20-9
SK25 COLLETS
21/64
0.3281 0.3320 0.3346 0.3390 0.3438 0.3480 0.3543 0.3580 0.3594 0.3680 0.3740 0.3750 0.3770 0.3860 0.3906 0.3937 0.3970 0.4040 0.4063 0.4130 0.4219 0.4331 0.4375 0.4531 0.4688 0.4724 0.4844 0.5000 0.5118 0.5156 0.5312 0.5469 0.5512 0.5625 0.5781 0.5906 0.5938 0.6094 0.6250 0.6299
Q
8.5
R
SK10-9 SK10-9 SK10-9 SK10-9
SK13-9 SK13-9 SK13-9 SK13-9
SK16-9 SK16-9 SK16-9 SK16-9
11/32
SK20-9 SK20-9 SK20-9 SK20-9
8.75 0.3445
S
9
SK10-9 SK10-9.5 SK10-9.5 SK10-9.5 SK10-9.5 SK10-9.5 SK10-10 SK10-10 SK10-10 SK10-10 SK10-10
SK13-9 SK13-9.5 SK13-9.5 SK13-9.5 SK13-9.5 SK13-9.5 SK13-10 SK13-10 SK13-10 SK13-10 SK13-10 SK13-10.5 SK13-10.5 SK13-10.5 SK13-10.5 SK13-10.5
SK16-9 SK16-9.5 SK16-9.5 SK16-9.5 SK16-9.5 SK16-9.5 SK16-10 SK16-10 SK16-10 SK16-10 SK16-10 SK16-10.5 SK16-10.5 SK16-10.5 SK16-10.5 SK16-10.5
T
SK20-9.5 SK20-9.5 SK20-9.5 SK20-9.5 SK20-9.5 SK20-10 SK20-10 SK20-10 SK20-10 SK20-10 SK20-10.5 SK20-10.5 SK20-10.5 SK20-10.5 SK20-10.5
23/64
9.25 0.3642
U
9.5
SK25-10
3/8
SK10-10/ SK10-3/8A SK13-10/SK13-3/8A SK16-10/ SK16-3/8A SK20-10/ SK20-3/8A SK25-10/SK25-3/8A
V
SK25-10 SK25-10 SK25-10 SK25-10 SK25-10
9.75 0.3839
W
25/64
10
X Y
13/32
Z
10.5 0.4134
27/64
SK13-11 SK13-11
SK16-11 SK16-11
SK20-11 SK20-11
11
7/16
SK25-7/16A
SK13-11.5/SK13-7/16A SK16-11.5/ SK16-7/16A SK20-11.5/ SK20-7/16A
11.5 0.4528
SK13-11.5 SK13-12 SK13-12 SK13-12 SK13-12.5 SK13-12.5
SK16-11.5 SK16-12 SK16-12 SK16-12 SK16-12.5 SK16-12.5 SK16-13 SK16-13.5 SK16-13.5 SK16-13.5
SK20-11.5 SK20-12 SK20-12 SK20-12 SK20-12.5 SK20-12.5 SK20-13 SK20-13.5 SK20-13.5 SK20-13.5
29/64 15/32
SK25-12 SK25-12 SK25-12
12
31/64
12.5 0.4921
1/2
SK13-13/SK13-1/2A SK16-13/ SK16-1/2A SK20-13/ SK20-1/2A
SK25-1/2A
13
SK13-13
33/64 17/32
13.5 0.5315
35/64
SK16-14 SK16-14
SK20-14 SK20-14
14
9/16
SK25-9/16A
SK16-14.5/ SK16-9/16A SK20-14.5/ SK20-9/16A
14.5 0.5709
SK16-14.5 SK16-15 SK16-15 SK16-15.5 SK16-15.5 SK16-15.5
SK20-14.5 SK20-15 SK20-15 SK20-15.5 SK20-15.5 SK20-15.5
37/64
15
19/32 39/64
15.5 0.6102
5/8
SK16-16/ SK16-5/8A SK20-16/ SK20-5/8A SK25-16/ SK25-5/8A
16
SK16-16
SK20-16
SK25-16
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