Bolt Threads per Inch (in)

Written by Matt Milbury. Posted in Thread Datasheets

Bolt Threads per Inch (in) Datasheet

Bolt

Size

Threads per Inch
Course

Threads

(UNC)

Fine

Threads

(UNF)

Extra-Fine

Threads

(UNEF)

#0000 - 160 -
#000 - 120 -
#00 - 90 -
#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 32
5/16 18 24 32
3/8 16 24 32
7/16 14 20 28
1/2 13 20 28
9/16 12 18 24
5/8 11 18 24
3/4 10 16 20
7/8 9 14 20
1 8 12 20
1 1/8 7 12 18
1 1/4 7 12 18
1 3/8 6 12 18
1 1/2 6 12 18
1 5/8 - - 18
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 - -
Bolt

Size

Threads per Inch
Course

Threads

(UNC)

Fine

Threads

(UNF)

Extra-Fine

Threads

(UNEF