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ASME B18.3 TABLE 5A Standard Dimensions for Hex socket set screws, inch series

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Socket set screws with flat, cup, oval, cone and half dog point.

Dimensional Drawing and Technical Diagrams

749_O64c2K_ASME-b18-3.jpg

Key Dimensions and Technical Parameters

Dimensions in mm - source ASMJE B18.3 Table 5A

Publication date: 2003
D Nominal size or Basic screw Diameter S nom T min

R nom oval point radius

 A cup end flat point diameters P Q
Diameter Length
max min max min max min
0 0.028 0.050 0.045 0.033 0.027 0.040 0.037 0.017 0.013
1 0.035 0.060 0.055 0.040 0.033 0.049 0.045 0.021 0.01
2 0.035 0.060 0.064 0.047 0.039 0.057 0.053 0.024 0.20
3 0.050 0.070 0.074 0.054 0.045 0.066 0.062 0.027 0.023
4 0.050 0.070 0.084 0.061 0.051 0.075 0.070 0.030 0.026
5 0.062 0.080 0.094 0.067 0.057 0.083 0.078 0.033 0.27
5 0.062 0.080 0.094 0.067 0.057 0.065 0.87 0.038 0.032
6 0.062 0.080 0.104 0.074 0.064 0.092 0.087 0.038 0.032
6 0.062 0.080 0.104 0.074 0.064 0.092 0.087 0.038 0.032
8 0.078 0.090 0.123 0.087 0.076 0.109 0.103 0.043 0.037
10 0.094 0.100 0.142 0.102 0.088 0.127 0.120 0.049 0.041
1/4 0.125 0.125 0.188 0.132 0.118 0.156 0.149 0.067 0.059
5/16 0.156 0.156 0.234 0.172 0.156 0.203 0.195 0.082 0.074
3/8 0.188 0.188 0.281 0.212 0.194 0.250 0.141 0.099 0.089
7/16 0.219 0.219 0.328 0.252 0.232 0297 0.287 0.114 0.104
1/2 0.250 0.250 0.375 0.291 0.270 0.344 0.334 0.130 .120
5/8 0.312 0.312 0.469 0.371 0.347 0.469 0.456 0.164 0.148
3/4 0.375 0.375 0.562 0.450 0.425

0.562

 0.549 0.196 0.180
7/8 0.500 0.500 0.656 0.530 0.502 0.656 0.642 0.227 0.211
1 0.562 0.562 0.750 0.609 0.579 0.750 0.734 0.260 0.240
1-1/8 0.562 0.562 0.844 0.689 0.655 0.844 0.803 0.291 0.71
1-1/4 0.625 0.625 0.938 0.767 0.733 0.938 0.920 0.323 0.303
1-3/8 0.625 0.625 1.031 0.848 0.808 1.031 1.011 0.354 0.334
1-1/2 0.750 0.750 1.125 0.926 0.886 1.125 1.105 0.385 0.365
1-3/4 1.000 1.000 1.312 1.086 1.039 1.312 1.289 0.448 0.428
2 1.000 1.000 1.500 1.244 1.193 1.500 1.484 0.510 0.490

Reproduced by permission of DIN Deutsches Institut für Normung e. V. The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from Beuth Verlag GmbH, Burggrafenstraße 6, 10787 Berlin, Germany.
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