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Imperial Thread Forms and Pitch


Diameter
(inches)
Threads per Inch (TPI)
BSW UNC UNF BSF
1/8 40 40
5/32 32 32
3/16 24 24 32 32
1/4 20 20 28 26
5/16 18 18 24 22
3/8 16 16 24 20
7/16 14 14 20 18
1/2 12 13 20 16
5/8 11 11 18 14
3/4 10 10 16 12
7/8 9 9 14 11
1 8 8 12 10
1-1/8 7 7 12 9
1-1/4 7 7 12 9
1-1/2 6 6 12 8

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