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12-pt flange screws

12-PT Flange Screws

Also known as a Ferry Cap Screw, or Double Hex Head Screw. The head design on a 12-point flange screw creates 2 times the number of contact points that a hex head would have. This design helps to achieve a higher torque and the flange under the head evenly distributes surface pressure without the use of a washer.

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Specifications & Technical Data

Dimensions

Nominal Size B D F C H W T A R LT Y
Body Diam. Flange Diam. Width Across Flats Width Across Corners Head Weight Wrenching Height Flange Thickness Gaging Ring Thickness Gaging Ring Diam. Thread Length Transition Thread Length
Min Max Min Max Min Min Max Min Min Max Min Max Min Basic Max
1/4 0.2435 0.375 0.365 0.252 0.244 0.278 0.26 0.15 0.058 0.0525 0.0522 0.2783 0.278 1 0.25
5/16 0.3053 0.469 0.457 0.315 0.306 0.348 0.312 0.18 0.074 0.0600 0.0597 0.3483 0.3480 1.125 0.28
3/8 0.3678 0.562 0.550 0.377 0.368 0.420 0.375 0.21 0.095 0.0711 0.0708 0.4203 0.4200 1.250 0.31
7/16 0.4294 0.656 0.642 0.438 0.429 0.489 0.438 0.26 0.109 0.0840 0.0837 0.4893 0.48980 1.375 0.36
1/2 0.4919 0.750 0.735 0.502 0.493 0.562 0.500 0.29 0.129 0.0948 0.0945 0.5623 0.5620 1.500 0.38
9/16 0.5538 0.844 0.828 0.564 0.555 0.633 0.563 0.33 0.145 0.1071 0.1068 0.6333 0.6330 1.625 0.42
5/8 0.6163 0.938 0.921 0.627 0.618 0.705 0.625 0.36 0.166 0.1179 0.1176 0.7053 0.7050 1.750 0.46
3/4 0.7406 1.125 1.107 0.752 0.743 0.847 0.750 0.44 0.200 0.1416 0.1413 0.8473 0.8470 2.000 0.50
7/8 0.8647 1.312 1.293 0.877 0.866 0.987 0.875 0.51 0.234 0.1656 0.1653 0.9873 0.9870 2.250 0.56
1 0.9886 1.500 1.479 1.003 0.991 11.130 1.000 0.60 0.268 0.1893 0.1890 1.1303 1.1300 2.500 0.62
1-1/8 1.1086 1.688 1.665 1.128 1.115 1.271 1.125 0.66 0.310 0.2109 0.2106 1.2713 1.2710 2.750 0.71
1-1/4 1.2336 1.875 1.852 1.253 1.240 1.414 1.250 0.73 0.350 0.2331 0.2328 1.4143 1.4140 3.000 0.71
1-3/8 1.3568 2.062 2.038 1.378 1.365 1.556 1.375 0.80 0.392 0.2544 0.2541 1.5563 1.5560 3.250 0.83
1-1/2 1.4818 2.250 2.224 1.503 1.489 1.697 1.500 0.87 0.433 0.2763 0.2760 1.6973 1.6970 3.500 0.83

12-PT Flange Screw Specifications

  • Standard (ASME/ANSI)
  • Metric (IFI)
    • IFI 115

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Nickel Systems provides high quality exotic grade materials that hold up in the toughest, most severe heat and corrosive environments. With our large inventory of specialty fasteners in stock, we are always ready to answer the call to serve the most challenging applications.

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