ASME/ANSI B18.2.2 SAE GR.2 THREAD UNF 1/4 - 28 ; 1 - 12 INDEX
1) Without marking
Specifications and reference standards: Material General requirements Thread
American Std. Tolerance American Std. Class
Steel ASME/ANSI B18.2.2 UNF 2B ASME B1.1 grade 2
Mechanical properties
American Std.
SAE J 995
Tolerances
American Std.
ASME/ANSI B18.2.2 Plain Requirements for electroplating are covered in ISO 4042.
Finish
If different electroplating requirements are desired or if requirements are needed for other finishes, they should be agreed between customer and supplier. Limits for surface discontinuities are covered in SAE J 122.
Acceptability
For acceptance procedure, see ASME/ANSI B18.2.2 and
SAE J 995.
mm Thread d UNF s e m dw
max.
1/4 - 28* 11.11
5/16 - 24 12.70
3/8 - 24 14.28
7/16 - 20* 17.47
1/2 - 20* 19.05
min.
10.87
12.42
14
17.15
18.69
min.
12.40
14.15
15.95
19.51
21.34
nom.
5.56
6.75
8.33
9.52
11.11
max.
5.74
6.93
8.56
9.78
11.38
min.
5.38
6.55
8.13
9.21
10.85
min.
10.33
11.80
13.30
16.29
17.76
* Available mm Thread d UNF s e m dw
9/16 - 18
5/8 - 18*
3/4 - 16
7/8 - 14*
1 - 12*
max.
22.22
23.82
28.57
33.32
38.10
min.
21.87
23.42
27.64
32.23
36.83
min.
24.94
26.7
31.50
36.75
41.99
nom.
12.30
13.89
16.27
19.05
21.83
max.
12.60
14.2
16.89
19.71
22.53
min.
12.02
13.59
15.67
18.39
21.11
min.
20.78
22.25
26.26
30.62
35
* Available