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OSTAR Tools --> Products --> Cutting for metal --> hss counterbores
 
HSS Counterbores
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SP
D
d1
d2
L2
L3
L1
M1/4
7/16
1/4
5/16
1/4
5/16
2-1/2
M5/16
1/2
5/16
3/8
5/16
3/8
2-1/2
M3/8
5/8
3/8
3/8
5/16
1/2
3
M1/2
3/4
1/2
1/2
3/8
5/8
3
M5/8
7/8
5/8
1/2
1/2
5/8
3-1/2
M3/4
1
3/4
3/4
1/2
5/8
3-1/2
 
SP
D
d1
d2
L2
L3
L1
M3
5.9
3.2
6
3
10
45
M4
7.4
4.2
6
4
12
48
M5
8.9
5.2
6
5
13
51
M6
10.4
6.2
8
6
15
58
M8
13.4
8.2
10
8
16
67
M10
16.8
10.3
12
10
16
74
M12
18.8
12.4
12
12
20
83
M14
24
14.4
12
14
25
90
M16
26
16.5
16
16
28
100
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