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Alma Bolt Company & Prime Fasteners 1-800-526-2200

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Counter Bore Screws

12-Point Counter bore Screws

Made from 4140 alloy steel, these screws feature 12 drive surfaces for high torque driving. The 12-point design provides the same bearing surface as hex or socket head cap screws of comparable size, and fits a standard 12-point socket. Stocked in coarse and fine threads, and in diameters from 3/16" to 2" and lengths to 30". Minimum tensile 170,000 PSI.

Group codes represented: 12PS
Part# examples: 31U7512PS, 100S50012PS

Nominal Size
B
D
F
C
W
T
A
R
LT
D
Body Diam.
Flage Diam.
Width Across Flats
Width Across Corner
Head Heights
Wrench-ing Height
Flange Thick-ness
Gauging Ring Thickness
Gauging Ring Diam
Thread Length
Transition Thread Length
Min
Max
Min
Max
Min
Max
Min
Min
Max
Min
Max
Min
Basic
Max
1/4 0.2435 0.375 0.365 0.252 0.278 0.260 0.15 0.058 0.0525 0.0522 0.2783 0.278 1.000 0.25
5/16 0.3053 0.469 0.457 0.315 0.348 0.312 0.18 0.074 0.0600 0.0597 0.3483 0.348 1.125 0.28
3/8 0.3678 0.562 0.550 0.377 0.420 0.375 0.21 0.095 0.0711 0.0708 0.4203 0.420 1.250 0.31
7/16 0.4294 0.656 0.642 0.438 0.489 0.438 0.26 0.109 0.0840 0.0837 0.4893 0.489 1.375 0.36
1/2 0.4919 0.750 0.735 0.502 0.562 0.500 0.29 0.129 0.0948 0.0945 0.5623 0.562 1.500 0.38
9/16 0.5538 0.844 0.828 0.564 0.633 0.563 0.33 0.145 0.1071 0.1068 0.6333 0.633 1.625 0.42
5/8 0.6163 0.938 0.921 0.627 0.705 0.625 0.36 0.166 0.1179 0.1176 0.7053 0.705 1.750 0.46
3/4 0.7406 1.125 1.107 0.752 0.847 0.750 0.44 0.200 0.1416 0.1413 0.8473 0.847 2.000 0.50
7/8 0.8647 1.312 1.293 0.877 0.987 0.875 0.51 0.234 0.1656 0.1653 0.9873 0.987 2.250 0.56
1 0.9886 1.500 1.479 1.003 1.130 1.000 0.60 0.268 0.1893 0.1890 1.1303 1.130 2.500 0.62
1-1/8 1.1086 1.688 1.665 1.128 1.271 1.125 0.66 0.310 0.2109 0.2106 1.2713 1.271 2.750 0.71
1-1/4 1.2336 1.875 1.852 1.253 1.414 1.250 0.73 0.350 0.2331 0.2328 1.4143 1.414 3.000 0.71
1-3/8 1.3568 2.062 2.038 1.378 1.556 1.375 0.80 0.392 0.2544 0.2541 1.5563 1.556 3.250 0.83
1-1/2 1.4818 2.250 2.224 1.503 1.697 1.500 0.87 0.433 0.2763 0.2760 1.6973 1.697 3.500 0.83
Tolerance on Length
Nominal Screw Lengths
Up to 1 in., incl.
Over 1 to 2 in., incl.
Over 2 to 6., incl.
Over 6 in.
-0.031 -0.047 -0.062 -0.125
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