ASME B18.6.3 TABLE 51

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Round Head Type U Metallic Drive Screws. Metallic ...Information restricted to registered users: Login | Register now for a 14 day free trial

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
5-40
6-32
8-32
10-24
10-32
12-24
1/4-20
5/16-18
3/8-16
7-16-14
1/2-20

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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Standard ASME B18.6.3 TABLE 51