SPU Series
Steel thread plug gauge for unified threads Coarse
Dimensions
- UNC (uniform coarse) = indicates the type of thread
- 3/8 (inch) = thread external diameter
- 16 (16 threads per inch) = indicates the number of threads per inch
Table for unified Thread, Type and Number of thread
| Nominal designation | Major diameter | Threads per inch | Threads per inch (Series thread) |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| inch | mm | UNC | UNF | UNEF | 4 UN | 6 UN | 8 UN | 12 UN | 16 UN | 20 UN | 28 UN | 32 UN | ||
| No. 0 No. 2 |
No. 1 |
0.0600 0.0730 0.0860 |
1.524 1.854 2.184 |
64 56 |
80 72 64 |
|||||||||
| No. 4 No. 5 |
No. 3 |
0.0990 0.1120 0.1250 |
2.515 2.845 3.175 |
48 40 40 |
56 48 44 |
|||||||||
| No. 6 No. 8 No.10 |
0.1380 0.1640 0.1900 |
3.505 4.166 4.826 |
32 32 24 |
40 36 32 |
||||||||||
| 1/4 |
No.12 |
0.2160 0.2500 |
5.486 6.350 |
24 20 |
28 28 |
32 32 |
||||||||
| 5/16 3/8 7/16 |
0.3125 0.3750 0.4375 |
7.938 9.525 11.113 |
18 16 14 |
24 24 20 |
32 32 28 |
16 |
20 20 |
28 28 |
32 |
|||||
| 1/2 9/16 5/8 |
0.5000 0.5625 0.6250 |
12.700 14.288 15.875 |
13 12 11 |
20 18 18 |
28 24 24 |
12 |
16 16 16 |
20 20 |
28 28 |
32 32 32 |
||||
| 3/4 |
11/16 13/16 |
0.6875 0.7500 0.8125 |
17.463 19.050 20.638 |
10 |
16 |
24 20 20 |
12 12 12 |
16 16 |
20 |
28 28 28 |
32 32 32 |
|||
| 7/8 1 |
15/16 |
0.8750 0.9375 1.0000 |
22.225 23.813 25.400 |
9 8 |
14 12 |
20 20 20 |
12 12 |
16 16 16 |
28 28 28 |
32 32 32 |
||||
| 1 1/8 |
1 1/16 1 3/16 |
1.0625 1.1250 1.1875 |
26.988 28.575 30.163 |
7 |
12 |
18 18 18 |
8 8 8 |
12 12 |
16 16 16 |
20 20 20 |
28 28 28 |
|||
| 1 1/4 1 3/8 |
1 5/16 |
1.2500 1.3125 1.3750 |
31.750 33.338 34.925 |
7 6 |
12 12 |
18 18 18 |
8 8 8 |
12 |
16 16 16 |
20 20 20 |
28 28 28 |
|||
| 1 1/2 |
1 7/16 1 9/16 |
1.4375 1.5000 1.5625 |
36.513 38.100 39.688 |
6 |
12 |
18 18 18 |
6 6 |
8 8 8 |
12 12 |
16 16 16 |
20 20 20 |
28 28 |
||
| 1 5/8 1 3/4 |
1 11/16 |
1.6250 1.6875 1.7500 |
41.275 42.863 44.450 |
5 |
18 18 |
6 6 6 |
8 8 8 |
12 12 12 |
16 16 16 |
20 20 20 |
||||
| 1 7/8 |
1 13/16 1 15/16 |
1.8125 1.8750 1.9375 |
46.038 47.625 49.213 |
6 6 6 |
8 8 8 |
12 12 12 |
16 16 16 |
20 20 20 |
||||||
| 2 | 2.0000 | 50.800 | 4 1/2 | 6 | 8 | 12 | 16 | 20 | ||||||
- Note) Unified screw threads which do not fall under the above category are classified into UNS(special thread)
Table for unified Thread, Type and Number of thread
| Nominal designation | Major diameter | Threads per inch | ||||
|---|---|---|---|---|---|---|
| inch |
mm |
UNC | UNF | UNEF | ||
| No. 0 No. 2 |
No. 1 |
0.0600 0.0730 0.0860 |
1.524 1.854 2.184 |
64 56 |
80 72 64 |
|
| No. 4 No. 5 |
No. 3 |
0.0990 0.1120 0.1250 |
2.515 2.845 3.175 |
48 40 40 |
56 48 44 |
|
| No. 6 No. 8 No.10 |
0.1380 0.1640 0.1900 |
3.505 4.166 4.826 |
32 32 24 |
40 36 32 |
||
| 1/4 |
No.12 |
0.2160 0.2500 |
5.486 6.350 |
24 20 |
28 28 |
32 32 |
| 5/16 3/8 7/16 |
0.3125 0.3750 0.4375 |
7.938 9.525 11.113 |
18 16 14 |
24 24 20 |
32 32 28 |
|
| 1/2 9/16 5/8 |
0.5000 0.5625 0.6250 |
12.700 14.288 15.875 |
13 12 11 |
20 18 18 |
28 24 24 |
|
| 3/4 |
11/16 13/16 |
0.6875 0.7500 0.8125 |
17.463 19.050 20.638 |
10 |
16 |
24 20 20 |
| 7/8 1 |
15/16 |
0.8750 0.9375 1.0000 |
22.225 23.813 25.400 |
9 8 |
14 12 |
20 20 20 |
| 1 1/8 |
1 1/16 1 3/16 |
1.0625 1.1250 1.1875 |
26.988 28.575 30.163 |
7 |
12 |
18 18 18 |
| 1 1/4 1 3/8 |
1 5/16 |
1.2500 1.3125 1.3750 |
31.750 33.338 34.925 |
7 6 |
12 12 |
18 18 18 |
| 1 1/2 |
1 7/16 1 9/16 |
1.4375 1.5000 1.5625 |
36.513 38.100 39.688 |
6 |
12 |
18 18 18 |
| 1 5/8 1 3/4 |
1 11/16 |
1.6250 1.6875 1.7500 |
41.275 42.863 44.450 |
5 |
18 18 |
|
| 1 7/8 |
1 13/16 1 15/16 |
1.8125 1.8750 1.9375 |
46.038 47.625 49.213 |
|||
| 2 | 2.0000 | 50.800 | 4 1/2 | |||
| Nominal designation | Threads per inch (Series thread) |
||||||||
|---|---|---|---|---|---|---|---|---|---|
| 4 UN | 6 UN | 8 UN | 12 UN | 16 UN | 20 UN | 28 UN | 32 UN | ||
| No. 0 No. 2 |
No. 1 |
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| No. 4 No. 5 |
No. 3 |
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| No. 6 No. 8 No.10 |
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| 1/4 |
No.12 |
||||||||
| 5/16 3/8 7/16 |
16 |
20 20 |
28 28 |
32 |
|||||
| 1/2 9/16 5/8 |
12 |
16 16 16 |
20 20 |
28 28 |
32 32 32 |
||||
| 3/4 |
11/16 13/16 |
12 12 12 |
16 16 |
20 |
28 28 28 |
32 32 32 |
|||
| 7/8 1 |
15/16 |
12 12 |
16 16 16 |
28 28 28 |
32 32 32 |
||||
| 1 1/8 |
1 1/16 1 3/16 |
8 8 8 |
12 12 |
16 16 16 |
20 20 20 |
28 28 28 |
|||
| 1 1/4 1 3/8 |
1 5/16 |
8 8 8 |
12 |
16 16 16 |
20 20 20 |
28 28 28 |
|||
| 1 1/2 |
1 7/16 1 9/16 |
6 6 |
8 8 8 |
12 12 |
16 16 16 |
20 20 20 |
28 28 |
||
| 1 5/8 1 3/4 |
1 11/16 |
6 6 6 |
8 8 8 |
12 12 12 |
16 16 16 |
20 20 20 |
|||
| 1 7/8 |
1 13/16 1 15/16 |
6 6 6 |
8 8 8 |
12 12 12 |
16 16 16 |
20 20 20 |
|||
| 2 | 6 | 8 | 12 | 16 | 20 | ||||
- Note) Unified screw threads which do not fall under the above category are classified into UNS(special thread)