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ASME B18.3 TABLE 3 Standard Dimensions for Hexagon and spline socket button head cap screws, inch series

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Hex and spline socket button head cap screws

Dimensional Drawing and Technical Diagrams

1680_NFndTb_ASME-B-18.3-table-3.jpg

Key Dimensions and Technical Parameters

Dimensions in inches - source ASME B18.3 table 3 - 2008 hex and spline socket button head cap screws
d basic thread size Nr of threads x inch A max H min L max standard T min J hex socket M spline socket
inches mm UNC UNF
0 (0.06) 1.52 - 80 0.114 0.026 0.5 0.02 0.035 0.048
1 (0.073) 1.85 64 72 0.139 0.033 0.5 0.028 0.05 0.06
2 (0.086) 2.18 56 64 0.164 0.046 0.5 0.028 0.05 0.06
3 (0.099) 2.51 48 56 0.188 0.052 0.5 0.035 0.062 0.072
4 (0.1129 2.84 40 48 0.213 0.059 0.5 0.035 0.062 0.072
5 (0.125) 3.18 40 44 0.238 0.066 0.5 0.044 0.078 0.096
6 (0.138) 3.51 32 40 0.262 0.073 0.63 0.044 0.078 0.096
8 (0.164) 4.17 32 36 0.312 0.087 0.750 0.052 0.094 0.111
10 (0.19) 4.83 24 32 0.361 0.101 1 0.07 0.125 0.145
1/4 6.35 20 28 0.437 0.132 1 0.087 0.156 0.183
5/16 7.94 18 24 0.547 0.166 1 0.105 0.188 0.216
3/8 9.53 16 24 0.656 0.199 1 0.122 0.219 0.251
1/2 12.70 13 20 0.875 0.265 2 0.175 0.312 0.372
5/8 15.88 11 18 1 0.331 2 0.21 0.375 0.454

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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