UNC UNF TPI chart

UNC UNF TPIchart.pdf

Bolt Size    No. or Inches

Threads Per Inch (TPI)

Coarse  Thread UNC

Fine Thread  UNF

#0 80
#1 64 72
#2 56 64
#3 48 56
#4 40 48
#5 40 44
#6 32 40
#8 32 36
#10 24 32
#12 24 28
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
1-3/8 6 12
1-1/2 6 12
1-3/4 5
2 4-1/2
2-1/4 4-1/2
2-1/2 4
2-3/4 4
3 4
3-1/4 4
3-1/2 4
3-3/4 4
4 4

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