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British Thread Chart - Threads Per Inch.

Size Cycle Engineers
Institute
(C.E.I.)		 Unified
Fine
(UNF)		 Unified
Coarse
(UNC)		 British
Standard
Fine
(BSF)		 British
Standard
Whitworth
(Coarse)
(BSW)
1/4" 26 28 20 26 20
5/16" 26 24 18 22 18
3/8" 26 24 16 20 16
7/16" 26 20 14 18 14
1/2" 20 20 13 16 12
9/16" 20 18 12 16 12
5/8" 20 18 11 14 11

 
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