Made in Japan
Manufacturer: Eisen Co., Ltd.
Model: SPU Series
Unified thread plug gauge (steel thread gauge)
About the Series
Shape
UNC (Unified Coarse) = represents the type of thread
3/8 (inch) = outer diameter of the screw
16 (16 threads per inch) = Pitch expressed as number of threads per inch
Series Details
Example of notation
List of Unified Thread Nominal and Number of Threads
| Call | Outside diameter | Number of threads (threads/inch) | Number of threads (threads/inch) Thread series |
|---|
| inch | Milli | 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 | Ten | 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 | Five | | 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 threads that do not fall into any of the above categories are UNS (special threads).
