Bolt Threads per Inch (in)

Written by Matt Milbury on . 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