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Technical Info - Thread Pitch Chart

Size Diameter (in) Thread Pitch (TPI)
UNC UNF
#0 0.0600 - 80
#1 0.0730 64 72
#2 0.0860 56 64
#3 0.0990 48 56
#4 0.1120 40 48
#5 0.1250 40 44
#6 0.1380 32 40
#8 0.1640 32 36
#10 0.1900 24 32
#12 0.2160 24 28
1/4 0.2500 20 28
5/16 0.3125 18 24
3/8 0.3750 16 24
7/16 0.4375 14 20
1/2 0.5000 13 20
9/16 0.5625 12 18
5/8 0.6250 11 18
3/4 0.7500 10 16
7/8 0.8750 9 14
1 1.0000 8 12
Size Diameter (in) Thread Pitch (TPI)
UNC 8-UN UNF
1-1/8 1.1250 7 8 12
1-1/4 1.2500 7 8 12
1-3/8 1.3750 6 8 12
1-1/2 1.5000 6 8 12
1-5/8 1.6250 - 8 -
1-3/4 1.7500 5 8 -
1-7/8 1.8750 - 8 -
2 2.0000 4-1/2 8 -
2-1/4 2.2500 4-1/2 8 -
2-1/2 2.5000 4 8 -
2-3/4 2.7500 4 8 -
3 3.0000 4 8 -
3-1/4 3.2500 4 8 -
3-1/2 3.5000 4 8 -
3-3/4 3.7500 4 8 -
4 4.0000 4 8 -