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Socket Head Cap Screws

Socket Head Cap Screws

Socket head cap screws are often used in assemblies with counterbored holes. The head height is equal to the nominal diameter. For sizes 1/4″ and larger, the head diameter is equal to one-and-a-half times the nominal diameter. Most sizes 1/2″ diameter and larger, are fully threaded. Nickel Systems maintains an inventory of socket head cap screws in both inch and metric sizes.

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Specifications & Technical Data

Dimensions

Dimensions of Hexagon and Spline Socket Head Cap Screws
Nominal Size (Basic Screw Diameter) Body Diameter, D Head Diameter, A Head Height, H Maximum Chamfer or Radius, C Nominal Spline Socket Size, M Nominal Hexagon Socket Size, J Minimum Key Engagement, T Minimum Wall Thickness, G Maximum Chamfer or Radius, K
Max Min Max Min Max Min
0 (0.0600) 0.0600 0.0568 0.096 0.091 0.060 0.057 0.004 0.060 — 0.050 0.025 0.020 0.007
1 (0.0730) 0.0730 0.0695 0.118 0.112 0.073 0.070 0.005 0.072 1/161/16 0.0620.062 0.031 0.025 0.007
2 (0.0860) 0.0860 0.0822 0.140 0.134 0.086 0.083 0.008 0.096 5/64 0.078 0.038 0.029 0.007
3 (0.0990) 0.0990 0.0949 0.161 0.154 0.099 0.095 0.008 0.096 5/64 0.078 0.044 0.034 0.007
4 (0.1120) 0.1120 0.1075 0.183 0.176 0.112 0.108 0.009 0.111 3/32 0.094 0.051 0.038 0.008
5 (0.1250) 0.1250 0.1202 0.205 0.198 0.125 0.121 0.012 0.111 3/32 0.094 0.057 0.043 0.008
6 (0.380) 0.1380 0.1329 0.226 0.218 0.138 0.134 0.013 0.133 7/64 0.109 0.064 0.047 0.008
8 (0.1640) 0.1640 0.1585 0.270 0.262 0.164 0.159 0.014 0.168 9/64 0.141 0.077 0.056 0.008
10 (0.1900) 0.1900 0.1840 0.312 0.303 0.190 0.185 0.018 0.183 5/32 0.156 0.090 0.065 0.008
1/4 (0.2500) 0.2500 0.2435 0.375 0.365 0.250 0.244 0.025 0.216 3/16 0.188 0.120 0.095 0.010
5/16 (0.3125) 0.3125 0.3053 0.469 0.457 0.312 0.306 0.033 0.291 1/4 0.250 0.151 0.119 0.010
3/8 (0.3750) 0.3750 0.3678 0.562 0.550 0.375 0.368 0.040 0.372 5/16 0.312 0.182 0.143 0.010
7/16 (0.4375) 0.4375 0.4294 0.656 0.642 0.438 0.430 0.047 0.454 3/8 0.375 0.213 0.166 0.015
1/2 (0.5000) 0.5000 0.4919 0.750 0.735 0.500 0.492 0.055 0.454 3/8 0.375 0.245 0.190 0.015
5/8 (0.6250) 0.6250 0.6163 0.938 0.921 0.625 0.616 0.070 0.595 1/2 0.500 0.307 0.238 0.015
3/4 (0.7500) 0.7500 0.7406 1.125 1.107 0.750 0.740 0.085 0.620 5/8 0.625 0.370 0.285 0.015
7/8 (0.8750) 0.8750 0.8647 1.312 1.293 0.875 0.864 0.100 0.698 3/4 0.750 0.432 0.333 0.020
1 (1.0000) 1.0000 0.9886 1.500 1.479 1.000 0.988 0.114 0.790 3/4 0.750 0.495 0.380 0.020
1-1/8 (1.1250) 1.1250 1.1086 1.688 1.665 1.125 1.111 0.129 — 7/8 0.875 0.557 0.428 0.020
1-1/4 (1.2500) 1.2500 1.2336 1.875 1.852 1.250 1.236 0.144 — 7/8 0.875 0.620 0.475 0.020
1-3/8 (1.3750) 1.3750 1.3568 2.062 2.038 1.375 1.360 0.160 — 1 1.000 0.682 0.523 0.020
1-1/2 (1.5000) 1.5000 1.4818 2.250 2.224 1.500 1.485 0.176 — 1 1.000 0.745 0.570 0.020
1-3/4 (1.7500) 1.7500 1.7295 2.625 2.597 1.750 1.734 0.207 — 1-1/4 1.250 0.870 0.665 0.020
2 (2.000) 2.000 1.9780 3.000 2.970 2.000 1.983 0.238 — 1-1/2 1.500 0.995 0.760 0.020
2-1/4 (2.2500) 2.2500 2.2280 3.375 3.344 2.250 2.232 0.269 — 1-3/4 1.750 1.120 0.855 0.036
2-1/2 (2.5000) 2.5000 2.4762 3.750 3.717 2.500 2.481 0.300 — 1-3/4 1.750 1.245 0.950 0.036
2-3/4 (2.7500) 2.7500 2.7262 4.125 4.090 2.750 2.730 0.332 — 2 2.000 1.370 1.045 0.036
3 (3.000) 3.000 2.9762 4.500 4.464 3.000 3.979 0.363 — 2-1/4 2.250 1.495 1.140 0.036
3-1/4 (3.2500) 3.2500 3.2262 4.875 4.837 3.250 3.228 0.394 — 2-1/4 2.250 1.620 1.235 0.036
3-1/2 (3.5000) 3.5000 3.4762 5.250 5.211 3.500 3.478 0.426 — 2-3/4 2.750 1.745 1.330 0.036
3-3/4 (3.7500) 3.7500 3.7262 5.625 5.584 3.750 3.727 0.458 — 2-3/4 2.750 1.870 1.425 0.036
4 (4.0000) 4.0000 3.9762 6.000 5.958 4.000 3.976 0.489 — 3 3.000 1.995 1.520 0.036

 

Socket Head Cap Screw Specifications

  • Standard (ASME/ANSI)
    • ASME B18.3-2003
  • Metric (IFI)
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Industries We Serve

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.

Nickel Systems maintains an inventory of Hastelloy® C276 socket head cap screws in both inch and metric sizes. Current inventory in socket head cap screws includes Duplex 2205, A286, Carpenter® 20 (Alloy 20), Nitronic® 60 (Alloy 60), 310 Stainless, 330 Stainless, 17-4 PH, 18-8 Stainless and 316 Stainless.

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