ASME B18.31.3

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Dimensions in inches (1 inch=25.4 mm) - source ASME B18.31.3 Publication date: 2009
d thread size	UNC	UNF
d thread size	Nr. of threads x inch	Nr. of threads x inch
Nr° 0	64	80
Nr° 1	56	72
Nr° 2	48	64
Nr° 3	40	56
Nr° 4
Nr° 5
Nr° 6
Nr° 8
Nr° 10
Nr° 12
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
1 1/8
1 1/4
1 3/8
1 1/2
1 3/4
2
2 1/4
2 1/2
2 3/4
3
3 1/4
3 1/2
3 3/4
4

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 B18.31.3