Fabrication


Socket Head Cap Screws

Diagram of socket head cap screw

Number Cap Screws

Screw SizeDecimal
Equiv.
Hex KeyScrew Head CounterboreCountersink
Diam, in, 60°
(C)
Clearance Drills
(D)
Diam, in Height, in Diam, in
(A)
Depth, in
(B)
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, in, 60°
(C)
Clearance Drills
(D)
Diam, in Height, in Diam, in
(A)
Depth, in
(B)
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, mm, 60°
(C)
Clearance Drills
(D)
Diam, mm Height, mm Diam, mm
(A)
Depth, mm
(B)
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


Other Resources


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DISCLAIMER

Page author: Dawn Rorvik (rorvikd@evergreen.edu)
Last modified: 05/20/2003