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
12 11 10
0.1890 0.1910 0.1935 0.1960 0.1969 0.1990 0.2010 0.2031 0.2040 0.2055 0.2090 0.2130 0.2165 0.2188 0.2210 0.2280 0.2340 0.2344 0.2362 0.2380 0.2420 0.2460 0.2500 0.2559 0.2570 0.2610 0.2656 0.2660 0.2720 0.2756 0.2770 0.2810 0.2812 0.2900 0.2950 0.2953 0.2969 0.3020 0.3125 0.3150 0.3160 0.3230
SK6-5.0 SK6-5.0 SK6-5.0 SK6-5.0 SK6-5.0 SK6-5.5 SK6-5.5 SK6-5.5 SK6-5.5 SK6-5.5 SK6-5.5 SK6-5.5 SK6-5.5 SK6-5.5
SK10-5 SK10-5 SK10-5 SK10-5 SK10-5
SK13-5 SK13-5 SK13-5 SK13-5 SK13-5
SK16-5 SK16-5 SK16-5 SK16-5 SK16-5
SK20-5 SK20-5 SK20-5 SK20-5
9
5
SK20-5 SK20-5.5 SK20-5.5 SK20-5.5 SK20-5.5 SK20-5.5 SK20-5.5 SK20-5.5 SK20-5.5 SK20-5.5 SK20-6 SK20-6
8 7 6 5 4 3
SK10-5.5 SK10-5.5 SK10-5.5 SK10-5.5 SK10-5.5 SK10-5.5 SK10-5.5 SK10-5.5 SK10-5.5
SK13-5.5 SK13-5.5 SK13-5.5 SK13-5.5 SK13-5.5 SK13-5.5 SK13-5.5 SK13-5.5 SK13-5.5
SK16-5.5 SK16-5.5 SK16-5.5 SK16-5.5 SK16-5.5 SK16-5.5 SK16-5.5 SK16-5.5 SK16-5.5
13/64
5.25 0.2067
5.5
7/32
SK6-6 SK6-6 SK6-6 SK6-6 SK6-6 SK6-6 SK6-6
SK10-6 SK10-6 SK10-6 SK10-6 SK10-6 SK10-6 SK10-6
SK13-6 SK13-6 SK13-6 SK13-6 SK13-6 SK13-6 SK13-6
SK16-6 SK16-6 SK16-6 SK16-6 SK16-6 SK16-6 SK16-6
2
5.75 0.2264
SK20-6 SK20-6 SK20-6 SK20-6
1
A
15/64
6
SK20-6 SK20-6.5 SK20-6.5 SK20-6.5 SK20-6.5
B C D
SK10-6.5 SK10-6.5 SK10-6.5 SK10-6.5
SK13-6.5 SK13-6.5 SK13-6.5 SK13-6.5
SK16-6.5 SK16-6.5 SK16-6.5 SK16-6.5
6.25 0.2461
1/4
E
SK6-1/4A
SK10-6.5/ SK10-1/4A SK13-6.5/SK13-1/4A SK16-6.5/ SK16-1/4A SK20-6.5/ SK20-1/4A
SK25-1/4A
6.5
SK10-6.5
SK13-6.5
SK16-6.5
SK20-6.5
F G
SK10-7 SK10-7 SK10-7 SK10-7 SK10-7 SK10-7 SK10-7
SK13-7 SK13-7 SK13-7 SK13-7 SK13-7 SK13-7 SK13-7
SK16-7 SK16-7 SK16-7 SK16-7 SK16-7 SK16-7 SK16-7
SK20-7 SK20-7 SK20-7 SK20-7 SK20-7 SK20-7 SK20-7
17/64
6.75 0.2657
H
I
7
J
SK10-7.5 SK10-7.5 SK10-7.5 SK10-7.5 SK10-7.5 SK10-7.5 SK10-7.5 SK10-8 SK10-8 SK10-8
SK13-7.5 SK13-7.5 SK13-7.5 SK13-7.5 SK13-7.5 SK13-7.5 SK13-7.5 SK13-8 SK13-8 SK13-8
SK16-7.5 SK16-7.5 SK16-7.5 SK16-7.5 SK16-7.5 SK16-7.5 SK16-7.5 SK16-8 SK16-8 SK16-8
SK20-7.5 SK20-7.5 SK20-7.5 SK20-7.5 SK20-7.5 SK20-7.5 SK20-7.5 SK20-8 SK20-8 SK20-8 SK20-8 SK20-8.5 SK20-8.5 SK20-8.5
K
9/32
7.25 0.2854
L
M
SK25-8 SK25-8 SK25-8 SK25-8 SK25-8
7.5
19/64
N
7.75 0.3051
5/16
SK10-8/ SK10-5/16A SK13-8/SK13-5/16A SK16-8/ SK16-5/16A SK20-8/ SK20-5/16A SK29-8/SK25-5/16A
8
SK10-8
SK13-8
SK16-8
SK25-8
O P
SK10-8.5 SK10-8.5 SK10-8.5
SK13-8.5 SK13-8.5 SK13-8.5
SK16-8.5 SK16-8.5 SK16-8.5
8.25 0.3248
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