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 |
|
B6 |
13% Chromium Ferritic Steel |
|
B6X |
13% Chromium Ferritic Steel |
|
B7 |
Chromium Molybdenum Alloy Steel, Quenched & Tempered |
|
B7M |
Chromium Molybdenum Alloy Steel, Quenched & Tempered |
|
B16 |
Chromium-molybdenum-vanadium Alloy Steel, Quenched & Tempered |
|
B8 |
Class 1 |
AISI 304 Stainless Steel, Carbide Solution Treated |
B8 |
Class 2 |
AISI 304 Stainless Steel, Carbide Solution Treated and Strain Hardened |
B8A |
AISI 304 Stainless Steel, Carbide solution treated in the finished condition |
|
B8C |
Class 1 |
AISI 347 Stainless Steel, Carbide Solution Treated |
B8C |
Class 2 |
AISI 347 Stainless Steel, Carbide Solution Treated and Strained Hardened |
B8CA |
AISI 347 Stainless Steel, Carbide Solution Treated in Finished Condition |
|
B8M |
Class 1 |
AISI 316 Stainless Steel, Carbide Solution Treated |
B8M |
Class 2 |
AISI 316 Stainless Steel, Carbide Solution Treated and Strain Hardened |
B8MA |
AISI 316 Stainless Steel, Carbide Solution Treated in Finished Condition |
|
B8M2 |
AISI 316 Stainless Steel, Carbide Solution Treated and Strain Hardened |
|
B8M3 |
AISI 316 Stainless Steel, Carbide Solution Treated and Strain Hardened |
|
B8P |
Class 1 |
AISI 305 Stainless Steel, Carbide Solution Treated |
B8P |
Class 2 |
AISI 305 Stainless Steel, Carbide Solution Treated and Strain Hardened |
B8PA |
AISI 305 Stainless Steel, Carbide Solution Treated in Finished Condition |
|
B8N |
AISI 304N Stainless Steel, Carbide Solution Treated |
|
B8N |
AISI 304N Stainless Steel, Carbide Solution Treated and Strain Hardened |
|
B8MLCuN |
AISI 304N Stainless Steel, Carbide Solution Treated |
|
B8MLCuN |
UNS S31254 Stainless Steel, Carbide Solution Treated and Strain Hardened |
|
B8MLCuNA |
UNS S31254 Stainless Steel, Carbide Solution Treated |
|
B8T |
Class 1 |
AISI 321 Stainless Steel, Carbide Solution Treated |
B8T |
Class 2 |
AISI 321 Stainless Steel, Carbide Solution Treated and Strain Hardened |
B8TA |
AISI 321 Stainless Steel, Carbide Solution Treated in Finished Condition |
|
B8R |
Nitronic 50/UNS S20910 Stainless Steel, Carbide Solution Treated |
|
B8RA |
Nitronic 50/UNS S20910 Stainless Steel, Carbide Solution Treated in Finished Condition |
|
B8S |
Nitronic 60/UNS S21800 Stainless Steel, Carbide Solution Treated |
|
B8SA |
Nitronic 60/UNS S21800 Stainless Steel, Carbide Solution Treated |
|
B8LN |
AISI 304LN Stainless Steel, Carbide Solution Treated |
|
B8LNA |
AISI 304LN Stainless Steel, Carbide Solution Treated in Finished Condition |
|
B8MLN |
AISI 316LN Stainless Steel, Carbide Solution Treated |
|
B8MLNA |
AISI 316LN Stainless Steel, Carbide Solution Treated in Finished Condition |
|
B8CLN |
AISI 347LN Stainless Steel, Carbide Solution Treated |
|
B8CLNA |
AISI 347LN Stainless Steel, Carbide Solution Treated in Finished Condition |
Grade |
Material |
UNS Number |
C, % |
Mn, % |
Ph, % |
S, % |
Si, % |
Cr, % |
Ni, % |
Mo, % |
Ti, % |
Cb & Ta, % |
N, % |
Other Elements, % |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
8MLN |
Type 316LN |
S31653 |
0.030 |
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 | ||
| 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 |
|---|---|---|
| 8M | 8M | 8MB |