Counterbored Holes Dimensions (imperial)

USA SOCKET-HEAD CAP SCREWS

Screw Diameter

Counterbore Diameter

Counterbore Depth

Countersink Diameter

Clearance
Diameter (normal fit)

Clearance
Diameter
(close fit)

#0

1/8"

0.06"

0.074"

#49

#51

#2

3/16"

0.086"

0.102"

#36

3/32"

#4

7/32"

0.112"

0.13"

#29

1/8"

#5

1/4"

0.125"

0.145"

#23

9/64"

#6

9/32"

0.138"

0.158"

#18

#23

#8

5/16"

0.164"

0.188"

#10

#15

#10

3/8"

0.19"

0.218"

#2

#5

1/4"

7/16"

0.25"

0.278"

9/32"

17/64"

16/5"

17/32"

0.312"

0.346"

11/32"

21/64"

3/8"

5/8"

0.375"

0.415"

13/32"

25/64"

7/16"

23/32"

0.438"

0.483"

15/32"

29/64"

1/2"

13/16"

0.5"

0.552"

17/32"

33/64"

5/8"

1"

0.625"

0.689"

21/32"

41/64"

3/4"

1-3/16"

0.750"

0.828"

25/32"

49/64"

7/8"

1-3/8"

0.875"

0.963"

29/32"

57/64"

1"

1-5/8"

1"

1.1"

1-1/32"

1-1/64"

1 1/4"

2"

1.25"

1.37"

1-5/16"

1-9/32"

1 1/2"

2-3/8"

1.5"

1.64"

1-9/16"

1-17/32"

1 3/4"

2-3/4"

1.75"

1.91"

1-13/16"

1-25/32"

2"

3-1/8"

2"

2.18"

2-1/16"

2-1/32"