ASTM A194 Grade 6 Specification
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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.
ASTM A194 Grade 6 Nut Grades
| 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 |
ASTM A194 Grade 6 Chemical Components
| Grade | Material | UNS Number |
C, % | Mn, % | Ph, % | S, % | Si, % | Cr, % | Ni, % | Mo, % | Ti, % | Cb & Ta, % | N, % | Other Elements, % |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
6
|
Type 410
|
S41000
|
0.150
|
1.000
|
0.040
|
0.030
|
1.000
|
11.5-13.5
|
-
|
-
|
-
|
-
|
-
|
-
|
ASTM A194 Grade 6 Hardness Requirement
|
Nominal Size, inch
|
Threads per inch
|
Stress Area inch
|
Proof Load, lbf
|
|
|---|---|---|---|---|
|
GRADE 6
|
||||
|
Heavy Hex
|
Hex
|
|||
|
1/4"
|
20
|
0.0316
|
4130
|
3820
|
|
5/16"
|
18
|
0.0524
|
6810
|
6290
|
|
3/8"
|
16
|
0.0774
|
10080
|
9300
|
|
7/16"
|
14
|
0.1063
|
13820
|
12760
|
|
1/2"
|
13
|
0.1419
|
18450
|
17030
|
|
9/16"
|
12
|
0.1820
|
23660
|
21840
|
|
5/8"
|
11
|
0.2260
|
29380
|
27120
|
|
3/4"
|
10
|
0.3340
|
43420
|
40080
|
|
7/8"
|
9
|
0.4620
|
60060
|
55440
|
|
1"
|
8
|
0.606
|
78780
|
72720
|
|
1 1/8"
|
8
|
0.7900
|
102700
|
94800
|
|
1 1/4"
|
8
|
1.0000
|
130000
|
120000
|
|
1 3/8"
|
8
|
1.2330
|
160200
|
148000
|
|
1 1/2"
|
8
|
1.492
|
194000
|
170040
|
ASTM A194 Grade 6 Marking
|
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
|
ASTM A194 Grade 6 Marking
| Grade Type | Hot Forged or Cold Punched Nuts | Nuts Machined from Bar Stock |
|---|---|---|
| 6 | 6 | 6B |