Threads Per Inch Reference Table

Threads Per Inch
NutsandBolts.com
Toll Free 800-872-5557
Size
COURSE
UNC
(USS)
FINE
UNF
(SAE)
BASIC
MAJOR
DIAMETER
0
  80
.0600
1
64
72
.730
2
56
64
.0860
3
48
56
.0990
4
40
48
.1120
5
40
44
.1250
6
32
40
.1380
8
32
36
.1640
10
24
32
.1900
12
24
28
.2160
1/4
20
28
.2500
5/16
18
24
.3125
3/8
16
24
.3750
7/16
14
20
.4375
1/2
13
20
.500
9/16
12
18
.5625
5/8
11
18
.6250
3/4
10
16
.7500
7/8
9
14
.8750
1
8
12 / 14
1.000
1-1/8
7
12
1.125
1-1/4
7
12
1.250
1-3/8
6
12
1.375
1-1/2
6
12
1.500
1-5/8
5-1/2
  1.625
1-3/4
5
  1.750
1-7/8
5
  1.875
2
4-1/2
  2
2-1/4
4-1/2
  2.250
2-1/2
4
  2.500
2-3/4
4
  2.750
3
4
  3
3-1/4
4
  3.250
3-1/2
4
  3.500
3-3/4
4
  3.750
4
4
  4.000

Picture is a general representation. Dimensions will vary depending on the product size you choose.

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