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ASME B18.6.3 Standard Dimensions for Inch size thread forming and trilobular tapping screws

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Inch size thread forming and trilobular tapping screws

Dimensional Drawing and Technical Diagrams

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Key Dimensions and Technical Parameters

Dimensions in INCHES - source ASME B18.6.3 TABLE 45 for type TRS Tapping Screws
Nominal screw size Basic screw diameter Major or C diameter (max) P Point diameter (max)
2-56 0.086 0.0875 0.07
3-48 0.099 0.101 0.081
4-40 0.112 0.1145 0.09
5-40 0.125 0.1275 0.103
6-32 0.138 0.141 0.111
8-32 0.164 0.167 0.137
10-24 0.19 0.194 0.153
10-32 0.19 0.193 0.163
12-24 0.212 0.22 0.179
1/4-20 0.25 0.255 0.209
5/16-18 0.3125 0.318 0.264
3/8-16 0.375 0.381 0.32
7-16-14 0.4375 0.4445 0.375
1/2-20 0.5 0.5075 0.433

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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