| Home > Technical Info > Threads Per Inch Reference Table
  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. |
|
