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Vented Socket Screws

Vented Socket Screws

A vented socket head cap screw is a specialized type of fastener designed for specific applications where pressure differentials need to be equalized or where gases or fluids need to pass through the screw.

These screws typically feature a small vent hole drilled through the head of the screw. The vent hole allows for the passage of air or other substances, helping to equalize pressure or release trapped gases or fluids in the assembly. Vented socket head cap screws are often used in applications such as vacuum chambers, fluid systems, or environments where pressure differentials are critical to performance or safety.

The presence of the vent hole does not compromise the structural integrity or strength of the screw but provides an additional functionality for specific engineering needs.

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Specifications & Technical Data

Dimensions

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

 

Dimensions

Nominal Size (Basic Screw Diameter) J
 T C R Y P Q
Nominal Hexagon Socket Size Minimum Key Engagement Cup and Flat Point Diameters Basic Oval Point Radius Cone Point Angle 90 deg ± 2 deg for These Nominal Lengths or Longer: 118 deg ± 2 deg for Shorter Nominal Half Dog Point
Diameter Length
Hex Socket, TH Max Min Max Min Max Min
5 (0.1250) 1/16 0.062 0.080 0.067 0.057 0.094 0.19 0.083 0.078 0.033 0.027
6 (0.1380) 1/16 0.062 0.080 0.074 0.064 0.104 0.19 0.092 0.087 0.038 0.032
8 (0.1640) 5/64 0.078 0.090 0.087 0.076 0.123 0.25 0.109 0.103 0.043 0.037
10 (0.1900) 3/32 0.094 0.100 0.102 0.088 0.142 0.25 0.127 0.120 0.049 0.041
1/4 (0.2500) 1/8 0.125 0.125 0.132 0.118 0.188 0.31 0.156 0.149 0.067 0.059
5/16 (0.3125) 5/32 0.156 0.156 0.172 0.156 0.234 0.38 0.203 0.195 0.082 0.074
3/8 (0.3750) 3/16 0.188 0.188 0.212 0.194 0.281 0.44 0.250 0.241 0.099 0.089
7/16 (0.4375) 7/32 0.219 0.219 0.252 0.232 0.328 0.50 0.297 0.287 0.114 0.104
1/2 (0.5000) 1/4 0.250 0.250 0.291 0.270 0.375 0.57 0.344 0.334 0.130 0.120
5/8 (0.6250) 5/16 0.312 0.312 0.371 0.347 0.469 0.75 0.469 0.456 0.164 0.148
3/4 (0.7500) 3/8 0.375 0.375 0.450 0.425 0.562 0.88 0.562 0.549 0.196 0.180
7/8 (0.8750) 1/2 0.500 0.500 0.530 0.502 0.656 1.00 0.656 0.642 0.227 0.211
1 (1.0000) 9/16 0.562 0.562 0.609 0.579 0.750 1.13 0.750 0.734 0.260 0.240
1-1/8 (1.1250) 9/16 0.562 0.562 0.689 0.655 0.844 1.25 0.844 0.826 0.291 0.271
1-1/4 (1.2500) 5/8 0.625 0.625 0.767 0.733 0.938 1.50 0.938 0.920 0.323 0.303
1-3/8 (1.3750) 5/8 0.625 0.625 0.848 0.808 1.031 1.63 1.031 1.011 0.354 0.334
1-1/2 (1.5000) 3/4 0.750 0.750 0.926 0.886 1.125 1.75 1.125 1.105 0.385 0.365
1-3/4 (1.7500) 1 1.000 1.000 1.086 1.039 1.312 2.00 1.312 1.289 0.448 0.428
2 (2.000) 1 1.000 1.000 1.244 1.193 1.500 2.25 1.500 1.474 0.510 0.490

 

Vented Socket Screw Specifications

  • Standard (ASME/ANSI)
  • 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 split lock washers in Hastelloy® (Alloys C276, C22, B2), Carpenter® 20 (Alloy 20), 18-8 and 316 Stainless. Current inventory includes 317L Stainless, K-Monel® (Alloy 500) and AL6XN®. Additionally, we can re-machine certain sizes to produce hi-collar lock washers for use with socket head cap screws.

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