ASTM A194 specification covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range 1/4 through 4 in. and metric M6 through M100 nominal. It also covers austenitic stainless steel nuts in the size range 1/4 in. and M6 nominal and above. These nuts are intended for high-pressure or high-temperature service, or both.
| Grade | Tensile Class | Raw Material |
|---|---|---|
| B5 | 4-6% Chromium Ferritic Steel |
| Grade | Material | UNS Number |
C, % | Mn, % | Ph, % | S, % | Si, % | Cr, % | Ni, % | Mo, % | Ti, % | Cb & Ta, % | N, % | Other Elements, % |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
8MN, 8MNA |
Type 316N |
S31651 |
0.080 |
2.000 |
0.045 |
0.030 |
1.000 |
16.0-18.0 |
10.0-13.0 |
2.0-3.0 |
- |
- |
0.10-0.16 |
- |
| Grade & Type | Brinell Hardness | Rockwell Hardness | |
|---|---|---|---|
| C Scale | B Scale | ||
| 8, 8C, 8M, 8T, 8F, 8MLCuN | 126-300 | 32 max | 60 min |
| 8A, 8CA, 8MA, 8TA, 8MLCuNA | 126-192 | - | 60 – 90 |
Nominal Size, inch |
Threads per inch |
Stress Area inch |
Proof Load, lbf |
|
|---|---|---|---|---|
All Types of Grade 8 |
||||
Heavy Hex |
Hex |
|||
1/4" |
20 |
0.0316 |
5570 |
4770 |
5/16" |
18 |
0.0524 |
9170 |
7860 |
3/8" |
16 |
0.0774 |
13560 |
11620 |
7/16" |
14 |
0.1063 |
18600 |
15940 |
1/2" |
13 |
0.1419 |
24830 |
21280 |
9/16" |
12 |
0.1820 |
31850 |
27300 |
5/8" |
11 |
0.2260 |
39550 |
33900 |
3/4" |
10 |
0.3340 |
58450 |
50100 |
7/8" |
9 |
0.4620 |
80850 |
69300 |
1" |
8 |
0.606 |
106000 |
90900 |
1 1/8" |
8 |
0.7900 |
138200 |
118500 |
1 1/4" |
8 |
1.0000 |
175000 |
150000 |
1 3/8" |
8 |
1.2330 |
215800 |
185000 |
1 1/2" |
8 |
1.492 |
261100 |
223800 |
| Grade Type | Hot Forged or Cold Punched Nuts | Nuts Machined from Bar Stock |
|---|---|---|
| 8 | 8 | 8B |