THREAD PITCH CHART FOR STANDARD SERIES (UNC / UNF / UNEF / UN)
Unified screw threads standard series are UNC, UNF, UNEF, UN-4, UN-6, UN-8, UN-12, UN-16, UN-20, UN-28 and UN-32 . Thread pitch chart for standard series up to 2 inch is given below [Source: Ref-1].
For Unified screw thread size and tolerance calculations, use
Unified Screw Threads and Tolerances Calculator
.
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Threads / in. |
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Series With Graded Pitches |
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Nominal Size, in. |
Basic Major
Diameter |
UNC |
UNF |
UNEF |
Series with Constant Pitches |
Nominal
Size, in. |
|
Primary |
Secondary |
4-UN |
6-UN |
8-UN |
12-UN |
16-UN |
20-UN |
28-UN |
32-UN |
|
0 |
-- |
0.0600 |
-- |
80 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
0 |
|
-- |
1 |
0.0730 |
64 |
72 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
1 |
|
2 |
-- |
0.0860 |
56 |
64 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
2 |
|
-- |
3 |
0.0990 |
48 |
56 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
3 |
|
4 |
-- |
0.1120 |
40 |
48 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
4 |
|
5 |
-- |
0.1250 |
40 |
44 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
5 |
|
6 |
-- |
0.1380 |
32 |
40 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
UNC |
6 |
|
8 |
-- |
0.1640 |
32 |
36 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
UNC |
8 |
|
10 |
-- |
0.1900 |
24 |
32 |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
-- |
UNF |
10 |
|
-- |
12 |
0.2160 |
24 |
28 |
32 |
-- |
-- |
-- |
-- |
-- |
-- |
UNF |
UNEF |
12 |
|
1/4 |
-- |
0.2500 |
20 |
28 |
32 |
-- |
-- |
-- |
-- |
-- |
UNC |
UNF |
UNEF |
1/4 |
|
5/16 |
-- |
0.3125 |
18 |
24 |
32 |
-- |
-- |
-- |
-- |
-- |
20 |
28 |
UNEF |
5/16 |
|
3/8 |
-- |
0.3750 |
16 |
24 |
32 |
-- |
-- |
-- |
-- |
UNC |
20 |
28 |
UNEF |
3/8 |
|
7/16 |
-- |
0.4375 |
14 |
20 |
28 |
-- |
-- |
-- |
-- |
16 |
UNF |
UNEF |
32 |
7/16 |
|
1/2 |
-- |
0.5000 |
13 |
20 |
28 |
-- |
-- |
-- |
-- |
16 |
UNF |
UNEF |
32 |
1/2 |
|
9/16 |
-- |
0.5625 |
12 |
18 |
24 |
-- |
-- |
-- |
UNC |
16 |
20 |
28 |
32 |
9/16 |
|
5/8 |
-- |
0.6250 |
11 |
18 |
24 |
-- |
-- |
-- |
12 |
16 |
20 |
28 |
32 |
5/8 |
|
-- |
11/16 |
0.6875 |
-- |
-- |
24 |
-- |
-- |
-- |
12 |
16 |
20 |
28 |
32 |
11/16 |
|
3/4 |
-- |
0.7500 |
10 |
16 |
20 |
-- |
-- |
-- |
12 |
UNF |
UNEF |
28 |
32 |
3/4 |
|
-- |
13/16 |
0.8125 |
-- |
-- |
20 |
-- |
-- |
-- |
12 |
16 |
UNEF |
28 |
32 |
13/16 |
|
7/8 |
-- |
0.8750 |
9 |
14 |
20 |
-- |
-- |
-- |
12 |
16 |
UNEF |
28 |
32 |
7/8 |
|
-- |
15/16 |
0.9375 |
-- |
-- |
20 |
-- |
-- |
-- |
12 |
16 |
UNEF |
28 |
32 |
15/16 |
|
1 |
-- |
1.0000 |
8 |
12 |
20 |
-- |
-- |
UNC |
UNF |
16 |
UNEF |
28 |
32 |
1 |
|
-- |
1 1/16 |
1.0625 |
-- |
-- |
18 |
-- |
-- |
8 |
12 |
16 |
20 |
28 |
-- |
1 1/16 |
|
1 1/8 |
-- |
1.1250 |
7 |
12 |
18 |
-- |
-- |
8 |
UNF |
16 |
20 |
28 |
-- |
1 1/8 |
|
-- |
1 3/16 |
1.1875 |
-- |
-- |
18 |
-- |
-- |
8 |
12 |
16 |
20 |
28 |
-- |
1 3/16 |
|
1 1/4 |
-- |
1.2500 |
7 |
12 |
18 |
-- |
-- |
8 |
UNF |
16 |
20 |
28 |
-- |
1 1/4 |
|
-- |
1 5/16 |
1.3125 |
-- |
-- |
18 |
-- |
-- |
8 |
12 |
16 |
20 |
28 |
-- |
1 5/16 |
|
1 3/8 |
-- |
1.3750 |
6 |
12 |
18 |
-- |
UNC |
8 |
UNF |
16 |
20 |
28 |
-- |
1 3/8 |
|
-- |
1 7/16 |
1.4375 |
-- |
-- |
18 |
-- |
6 |
8 |
12 |
16 |
20 |
28 |
-- |
1 7/16 |
|
1 1/2 |
-- |
1.5000 |
6 |
12 |
18 |
-- |
UNC |
8 |
UNF |
16 |
20 |
28 |
-- |
1 1/2 |
|
-- |
1 9/16 |
1.5625 |
-- |
-- |
18 |
-- |
6 |
8 |
12 |
16 |
20 |
-- |
-- |
1 9/16 |
|
1 5/8 |
-- |
1.6250 |
-- |
-- |
18 |
-- |
6 |
8 |
12 |
16 |
20 |
-- |
-- |
1 5/8 |
|
-- |
1 11/16 |
1.6875 |
-- |
-- |
18 |
- |
6 |
8 |
12 |
16 |
20 |
-- |
-- |
1 11/16 |
|
1 3/4 |
-- |
1.7500 |
5 |
-- |
-- |
-- |
6 |
8 |
12 |
16 |
20 |
-- |
-- |
1 3/4 |
|
-- |
1 13/16 |
1.8125 |
-- |
-- |
-- |
-- |
6 |
8 |
12 |
16 |
20 |
-- |
-- |
1 13/16 |
|
1 7/8 |
-- |
1.8750 |
-- |
-- |
-- |
-- |
6 |
8 |
12 |
16 |
20 |
-- |
- |
1 7/8 |
|
-- |
1 15/16 |
1.9375 |
-- |
-- |
-- |
-- |
6 |
8 |
12 |
16 |
20 |
-- |
-- |
1 15/16 |
|
2 |
-- |
2.000 |
4 1/2 |
-- |
-- |
-- |
6 |
8 |
12 |
16 |
20 |
-- |
-- |
2 |
Reference:
-
ASME B1.1-2003, Unified Inch Screw Threads (UN and UNR Thread Form)
