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UNF Thread ANSI B1.1 |
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UNF - Unified National Fine Thread. Similar to UNC. UNC and UNF threads are the choices for the customary Unified screws and nuts. |
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Nominal |
Major |
Major |
Tapping Drill |
TPI |
Pitch |
|
0 - 80 UNF |
0.060 |
1.524 |
1.25 |
80 |
0.317 |
|
1 - 72 UNF |
0.073 |
1.854 |
1.55 |
72 |
0.353 |
|
2 - 64 UNF |
0.068 |
2.184 |
1.90 |
64 |
0.397 |
|
3 - 56 UNF |
0.099 |
2.515 |
2.15 |
56 |
0.453 |
|
4 - 48 UNF |
0.112 |
2.845 |
2.40 |
48 |
0.529 |
|
5 - 44 UNF |
0.125 |
3.175 |
2.70 |
44 |
0.577 |
|
6 - 40 UNF |
0.138 |
3.505 |
2.95 |
40 |
0.635 |
|
8 - 36 UNF |
0.164 |
4.166 |
3.50 |
36 |
0.705 |
|
10 - 32 UNF |
0.190 |
4.826 |
4.10 |
32 |
0.794 |
|
12 - 28 UNF |
0.216 |
5.486 |
4.70 |
28 |
0.907 |
|
1/4" - 28 UNF |
0.250 |
6.350 |
5.50 |
28 |
0.907 |
|
5/16" - 24 UNF |
0.313 |
7.938 |
6.90 |
24 |
1.058 |
|
3/8" - 24 UNF |
0.375 |
9.525 |
8.50 |
24 |
1.058 |
|
7/16" - 20 UNF |
0.438 |
11.112 |
9.90 |
20 |
1.270 |
|
1/2" - 20 UNF |
0.500 |
12.700 |
11.50 |
20 |
1.270 |
|
9/16" - 18 UNF |
0.563 |
14.288 |
12.90 |
18 |
1.411 |
|
5/8" - 18 UNF |
0.625 |
15.875 |
14.50 |
18 |
1.411 |
|
3/4" - 16 UNF |
0.750 |
19.050 |
17.50 |
16 |
1.587 |
|
7/8" - 14 UNF |
0.875 |
22.225 |
20.40 |
14 |
1.814 |
|
1" - 12 UNF |
1.000 |
25.400 |
23.25 |
12 |
2.117 |
|
1 1/8" - 12 UNF |
1.125 |
28.575 |
26.50 |
12 |
2.117 |
|
1 1/4" - 12 UNF |
1.250 |
31.750 |
29.50 |
12 |
2.117 |
|
1 3/8" - 12 UNF |
1.375 |
34.925 |
32.75 |
12 |
2.117 |
|
1 1/2" - 12 UNF |
1.500 |
38.100 |
36.00 |
12 |
2.117 |