Grade 8F
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Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or both. 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, % |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 |
Carbon |
0.15 min |
1.000 |
0.040 |
0.050 |
0.400 |
- |
- |
- |
- |
- |
- |
- |
|
2, 2HM, & 2H |
Carbon |
0.40 min |
1.000 |
0.040 |
0.050 |
0.400 |
- |
- |
- |
- |
- |
- |
- |
|
2H |
Carbon |
0.40 min |
1.000 |
0.040 |
0.050 |
0.400 |
- |
- |
- |
- |
- |
- |
- |
|
2HM |
Carbon |
0.40 min |
1.000 |
0.040 |
0.050 |
0.400 |
- |
- |
- |
- |
- |
- |
- |
|
3 |
Type 501 |
0.10 min |
1.000 |
0.040 |
0.030 |
1.000 |
4.0-6.0 |
- |
0.40-0.65 |
- |
- |
- |
- |
|
4 |
carbon, molybdenum |
0.40-0.50 |
0.70-0.90 |
0.035 |
0.040 |
0.15-0.35 |
- |
0.20-0.30 |
- |
- |
- |
- |
||
6 |
Type 410 |
S41000 |
0.150 |
1.000 |
0.040 |
0.030 |
1.000 |
11.5-13.5 |
- |
- |
- |
- |
- |
- |
6F |
Type 416 |
S416000 |
0.150 |
1.250 |
0.060 |
0.15min |
1.000 |
12.0-14.0 |
- |
- |
- |
- |
- |
|
6F |
Type 416Se |
S41623 |
0.150 |
1.250 |
0.060 |
0.060 |
1.000 |
12.0-14.0 |
- |
- |
- |
- |
Selenium, 0.15 min |
|
7, 7M |
Type 4140, 4142, 4145, 4140H, 4142H, 4145H |
0.37-0.49 |
0.65-1.10 |
0.035 |
0.040 |
0.15-0.35 |
0.75-1.2 |
- |
0.15-0.25 |
- |
- |
- |
- |
|
8 |
Type 304 |
S30400 |
0.080 |
2.000 |
0.045 |
0.030 |
1.000 |
18.0-20.0 |
8.0-11.0 |
- |
- |
- |
- |
|
8A |
Type 304 |
0.080 |
2.000 |
0.045 |
0.030 |
1.000 |
18.0-20.0 |
8.0-11.0 |
- |
- |
- |
- |
||
8C |
Type 347 |
S34700 |
0.080 |
2.000 |
0.045 |
0.030 |
1.000 |
17.0-19.0 |
9.0-12.0 |
- |
10 x Carbon Content, min |
- |
- |
|
8CA |
Type 347 |
S34700 |
0.080 |
2.000 |
0.045 |
0.030 |
1.000 |
17.0-19.0 |
9.0-12.0 |
- |
10 x Carbon Content, min |
- |
- |
|
8CLN, 8CLNA |
Type 347LN |
S34751 |
0.0005-0.020 |
2.000 |
0.045 |
0.030 |
1.000 |
17.0-19.0 |
9.0-13.0 |
- |
0.20-0.50, 15 x Carbon Content,min |
0.06-0.10 |
- |
|
8M, 8MA |
Type 316 |
S31600 |
0.080 |
2.000 |
0.045 |
0.030 |
1.000 |
16.0-18.0 |
10.0-14.0 |
2.00-3.00 |
- |
- |
- |
- |
8T, 8TA |
Type 321 |
S32100 |
0.080 |
2.000 |
0.045 |
0.030 |
1.000 |
17.0-19.0 |
9.0-12.0 |
- |
5 x (C+N),Min – 0.70 max |
- |
0.100 |
- |
8F, 8FA |
Type 303 |
S30300 |
0.150 |
2.000 |
0.200 |
0.150 |
1.000 |
17.0-19.0 |
8.0-10.0 |
- |
- |
- |
- |
- |
8F, 8FA |
Type 303 Se |
S30323 |
0.150 |
2.000 |
0.200 |
0.06 |
1.000 |
17.0-19.0 |
8.0-10.0 |
- |
- |
- |
- |
Selenium, 0.15 min |
8P, 8PA |
Type 305 with restricted carbon |
S30500 |
0.080 |
2.000 |
0.045 |
0.030 |
1.000 |
17.0-19.0 |
11.0-13.0 |
- |
- |
- |
- |
- |
8N, 8NA |
Type 304N |
S30451 |
0.080 |
2.000 |
0.045 |
0.030 |
1.000 |
18.0-20.0 |
8.0-11.0 |
- |
- |
- |
0.10-0.16 |
- |
8LN, 8LNA |
0.030 |
2.000 |
0.045 |
0.030 |
1.000 |
18.0-20.0 |
8.0-11.0 |
- |
- |
- |
0.10-0.16 |
- |
||
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 |
- |
8MLN, 8MLNA |
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 |
- |
8R, 8RA |
XM19 |
S20910 |
0.060 |
4.0-6.0 |
0.045 |
0.030 |
1.000 |
20.5-23.5 |
11.5-13.5 |
1.50-3.0 |
- |
0.10-0.30 |
0.20-0.40 |
Vanadium, 0.10-0.30 |
8S, 8SA |
S21800 |
0.100 |
7.0-9.0 |
0.060 |
0.030 |
3.5-4.5 |
16.0-18.0 |
8.0-9.0 |
- |
- |
- |
0.08-0.18 |
- |
|
8MLCuN, 8MLCuNA |
S31254 |
S31254 |
0.020 |
1.000 |
0.030 |
0.010 |
0.800 |
19.5-20.5 |
17.5-18.5 |
6.0-6.5 |
- |
- |
0.18-0.25 |
Copper 0.50-1.00 |
9C, 9CA |
N08367 |
N08367 |
0.030 |
2.000 |
0.040 |
0.030 |
1.000 |
20.0-22.0 |
23.5-25.5 |
6.0-7.0 |
- |
- |
0.18-0.25 |
Copper 0.75 |
16 |
Chromium Molybdenum Vanadium |
0.36-0.47 |
0.45-0.70 |
0.035 |
0.040 |
0.15-0.35 |
0.80-1.15 |
0.50-0.65 |
- |
- |
- |
Vanadium 0.25-0.35 AluminumB 0.015 |
Grade & Type |
Brinell Hardness |
Rockwell Hardness |
|
|---|---|---|---|
C Scale |
B Scale |
||
8F |
126-300 |
32 max |
60 min |
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 |
|---|---|---|
| 8S | 8S | 8SB |