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ASME B18.6.3 TABLE 51 Standard Dimensions for Drive screws round head type U, inch sizes

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Round Head Type U Metallic Drive Screws. Metallic Drive screws are designated Type U. They shall have multiple start threads of a large helix angle with a pilot point. These screws are intended for making permanent fastenings in metals and plastics, when forced into the work under pressure.

Dimensional Drawing and Technical Diagrams

746_PYQLoO_ASME-b-18.6.3-table-51.jpg

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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