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Socket Head Cap Screw Size Chart

This chart contains information on number, metric and fractional number socket head cap screws, along with tap drill information. If all else fails, you may want to use our Drill Size Conversion Table or our Tap Drill Size Calculator. The information available from our sources is usually sufficient for all computer related drill or screw requirements world wide.

Number Cap Screws
Screw SizeDecimal
Equiv.
Hex KeyScrew Head CounterboreCountersink
Diam, 60° (in)
Clearance Drills
Diam. (in) Height (in) Diam. (in) Depth (in) Norm. Fit Close Fit
No. 0 0.060 0.050 0.096 0.060 1/8 0.060 0.074 #49 #51
No. 1 0.073 1/16 0.118 0.073 5/32 0.073 0.087 #43 #46
No. 2 0.086 5/64 0.140 0.086 3/16 0.086 0.102 #36 3/32"
No. 3 0.099 5/64 0.161 0.099 7/32 0.099 0.115 #31 #36
No. 4 0.112 3/32 0.183 0.112 7/32 0.112 0.130 #29 1/8"
No. 5 0.125 3/32 0.205 0.125 1/4 0.125 0.145 #23 9/64"
No. 6 0.138 7/64 0.226 0.138 9/32 0.138 0.158 #18 #23
No. 8 0.164 9/64 0.270 0.164 5/16 0.164 0.188 #10 #15
No. 10 0.190 5/32 0.312 0.190 3/8 0.190 0.218 #2 #5
No. 12 0.216 5/32 0.345 0.216 13/32 0.216   1/4" 15/64"


Fractional Cap Screws
Screw SizeDecimal
Equiv.
Hex KeyScrew Head CounterboreCountersink
Diam, 60° (in)
Clearance Drills
Diam. (in) Height (in) Diam. (in) Depth (in) Norm. Fit Close Fit
1/4" 0.250 3/16 0.375 0.250 7/16 0.250 0.278 9/32" 17/64"
5/16" 0.313 1/4 0.469 0.313 17/32 0.313 0.346 11/32" 21/64"
3/8" 0.375 5/16 0.563 0.375 5/8 0.375 0.415 13/32" 25/64"
7/16" 0.438 3/8 0.656 0.438 23/32 0.438 0.483 15/32" 29/64"
1/2" 0.500 3/8 0.750 0.500 13/16 0.500 0.552 17/32" 33/64"
9/16" 0.563 7/16 0.844 0.563 29/32 0.563   39/64" 37/64"
5/8" 0.625 1/2 0.938 0.625 1 0.625 0.689 21/32" 41/64"
3/4" 0.750 5/8 1.125 0.750 1-3/16 0.750 0.828 25/32" 49/64"
7/8" 0.875 3/4 1.313 0.875 1-3/8 0.875 0.963 29/32" 57/64"
1" 1.000 3/4 1.500 1.000 1-5/8 1.000 1.100 1-1/32" 1-1/64"
1-1/8" 1.125 7/8 1.688 1.125 1-13/16 1.125   1-11/64" #26
1-1/4" 1.250 7/8 1.875 1.250 2 1.250 1.370 1-5/16" 1-9/32"
1-1/2" 1.500 1 2.250 1.500 2-3/8 1.500 1.640 1-9/16" 1-17/32"
1-3/4" 1.750 1-1/4 2.625 1.750 2-3/4 1.750 1.910 1-13/16" 1-25/32"
2" 2.000 1-1/2 3.000 2.000 3-1/8 2.000 2.180 2-1/16" 2-1/32"


Metric Cap Screws
Screw SizeDecimal
Equiv.
Hex KeyScrew Head CounterboreCountersink
Diam, 60° (mm)
Clearance Drills
Diam. (mm) Height (mm) Diam. (mm) Depth (mm) Norm. Fit Close Fit
M1.6 0.062 1.5 3.0 1.6 3.50 1.6 2.0 1.95 1.80
M2 0.078 1.5 3.8 2.0 4.40 2.0 2.6 2.40 2.20
M2.5 0.098 2 4.5 2.5 5.40 2.5 3.1 3.00 2.70
M2.6 0.102 2 5.0 2.6 6.00 2.6   3.20 3.00
M3 0.118 2.5 5.5 3.0 6.50 3.0 3.6 3.70 3.40
M4 0.157 3 7.0 4.0 8.25 4.0 4.7 4.80 4.40
M5 0.196 4 8.5 5.0 9.75 5.0 5.7 5.80 5.40
M6 0.236 5 10.0 6.0 11.20 6.0 6.8 6.80 6.40
M8 0.315 6 13.0 8.0 14.50 8.0 9.2 8.80 8.40
M10 0.393 8 16.0 10.0 17.50 10.0 11.2 10.80 10.50
M12 0.472 10 18.0 12.0 19.50 12.0 14.2 13.00 12.50
M14 0.551 12 21.0 14.0 22.50 14.0 16.2 15.00 14.50
M16 0.629 14 24.0 16.0 25.50 16.0 18.2 17.00 16.50
M18 0.708 14 27.0 18.0 28.50 18.0   19.00 18.50
M20 0.787 17 30.0 20.0 31.50 20.0 22.4 21.00 20.50
M24 0.944 19 36.0 24.0 37.50 24.0 26.4 25.00 24.50
M30 1.181 22 45.0 30.0 47.50 30.0 33.4 31.50 31.00
M36 1.417 27 54.0 36.0 56.50 36.0 39.4 37.50 37.00
M42 1.653   63.0 42.0 66.00 42.0 45.6 44.00 43.00
M48 1.889   72.0 48.0 75.00 48.0 52.6 50.00 49.00
Updated: 7/31/11


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