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US Threads Per Inch Table

Bolt Size Threads Per Inch (TPI)
Coarse Thread
UNC		 Fine Thread
UNF
#2 56 -
#3 48 -
#4 40 -
#5 40 -
#6 32 -
#8 32 -
#10 24 32
#12 24 -
1/4 20 28
5/16 18 24
3/8 16 24
7/16 14 20
1/2 13 20
9/16 12 18
5/8 11 18
3/4 10 16
7/8 9 14
1 8 12*
1-1/8 7 12
1-1/4 7 12
1-1/2 6 12
* 12tpi is the UNF standard however 14tpi is far more common in actual use.

 

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