,

Eisen SRU Series Limit Screw Gauge

Made in Japan
Manufacturer: Eisen Co., Ltd.
Model: SRU Series

Unified thread ring gauge (steel thread gauge)

About the Series

SRU Series

Shape

Shape examplesUNC (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).

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