Identification Grade Mark | Specification | Fastener Description | Material | Nominal Size Range (in) | Proof Load (psi) | Min Yield Strength (psi) | Min Tensile Strength (psi) |
![BOLT NO MARK.jpg](/wiki/images/5/5c/BOLT_NO_MARK.jpg) |
SAE J429 Grade 1 |
Bolts, Screws, Studs |
Low or Medium Carbon Steel |
1/4 thru 1 1/2 |
33,000 |
36,000 |
60,000 |
![BOLT NO MARK.jpg](/wiki/images/5/5c/BOLT_NO_MARK.jpg) |
ASTM A307 Grade A & B |
Bolts, Screws, Studs |
Low Carbon Steel |
1/4 thru 4 |
- |
- |
60,000 |
![BOLT NO MARK.jpg](/wiki/images/5/5c/BOLT_NO_MARK.jpg) |
SAE J429 Grade 2 |
Bolts, Screws, Studs |
Low or Medium Carbon Steel |
1/2 thru 3/4
Over 3/4 thru 1 1/2
|
55,000
33,000
|
57,000
36,000
|
74,000
60,000
|
![BOLT NO MARK.jpg](/wiki/images/5/5c/BOLT_NO_MARK.jpg) |
SAE J429 Grade 4 |
Studs |
Medium Carbon Cold Drawn Steel |
1/4 thru 1 1/2 |
- |
100,000 |
115,000 |
![BOLT B5.jpg](/wiki/images/b/bf/BOLT_B5.jpg) |
ASTM A193 Grade B5 |
Bolts, Screws, Studs for High Temperature Service |
AISI 501 |
1/4 thru 4 |
- |
80,000 |
100,000 |
![BOLT B6.jpg](/wiki/images/5/5c/BOLT_B6.jpg) |
ASTM A193 Grade B6 |
Bolts, Screws, Studs for High Temperature Service |
AISI 410 |
1/4 thru 4 |
- |
85,000 |
110,000 |
![BOLT B7.jpg](/wiki/images/2/21/BOLT_B7.jpg) |
ASTM A193 Grade B7 |
Bolts, Screws, Studs for High Temperature Service |
AISI 4140
AISI 4142
AISI 4145
|
1/4 thru 2 1/2
Over 2 1/2 thru 4
Over 4 thru 7
|
-
-
-
|
105,000
95,000
75,000
|
125,000
150.000
100,000
|
![BOLT B16.jpg](/wiki/images/5/5a/BOLT_B16.jpg) |
ASTM A193 Grade B16 |
Bolts, Screws, Studs for High Temperature Service |
CrMoVa
Alloy Steel
|
1/4 thru 2 1/2
Over 2 1/2 thru 4
Over 4 thru 7
|
-
-
-
|
105,000
95,000
85,000
|
125,000
150.000
100,000
|
![BOLT B8.jpg](/wiki/images/d/db/BOLT_B8.jpg) |
ASTM A193 Grade B8 |
Bolts, Screws, Studs for High Temperature Service |
AISI 304 |
1/4 and larger |
- |
30,000 |
75,000 |
![BOLT B8C.jpg](/wiki/images/c/ca/BOLT_B8C.jpg) |
ASTM A193 Grade B8C |
Bolts, Screws, Studs for High Temperature Service |
AISI 347 |
1/4 and larger |
- |
30,000 |
75,000 |
![BOLT B8M.jpg](/wiki/images/1/1d/BOLT_B8M.jpg) |
ASTM A193 Grade B8M |
Bolts, Screws, Studs for High Temperature Service |
AISI 316 |
1/4 and larger |
- |
30,000 |
75,000 |
![BOLT B8T.jpg](/wiki/images/8/8f/BOLT_B8T.jpg) |
ASTM A193 Grade B8T |
Bolts, Screws, Studs for High Temperature Service |
AISI 321 |
1/4 and larger |
- |
30,000 |
75,000 |
![BOLT B8 U.jpg](/wiki/images/a/a1/BOLT_B8_U.jpg) |
ASTM A193 Grade B8 |
Bolts, Screws, Studs for High Temperature Service |
AISI 304
Strain Handened
|
1/4 thru 3/4
Over 3/4 thru 1
Over 1 thru 1 1/4
Over 1 1/4thru 1 1/2
|
-
-
-
-
|
100,000
80,000
65,000
50,000
|
125,000
150,000
105,000
100,000
|
![BOLT B8C U.jpg](/wiki/images/3/32/BOLT_B8C_U.jpg) |
ASTM A193 Grade B8C |
Bolts, Screws, Studs for High Temperature Service |
AISI 347
Strain Handened
|
1/4 thru 3/4
Over 3/4 thru 1
Over 1 thru 1 1/4
Over 1 1/4thru 1 1/2
|
-
-
-
-
|
100,000
80,000
65,000
50,000
|
125,000
150,000
105,000
100,000
|
![BOLT B8M U.jpg](/wiki/images/4/4f/BOLT_B8M_U.jpg) |
ASTM A193 Grade B8M |
Bolts, Screws, Studs for High Temperature Service |
AISI 316
Strain Handened
|
1/4 thru 3/4
Over 3/4 thru 1
Over 1 thru 1 1/4
Over 1 1/4thru 1 1/2
|
-
-
-
-
|
95,000
80,000
65,000
50,000
|
110,000
100,000
95,000
90,000
|
![BOLT B8T U.jpg](/wiki/images/7/7e/BOLT_B8T_U.jpg) |
ASTM A193 Grade B8T |
Bolts, Screws, Studs for High Temperature Service |
AISI 347
Strain Handened
|
1/4 thru 3/4
Over 3/4 thru 1
Over 1 thru 1 1/4
Over 1 1/4thru 1 1/2
|
-
-
-
-
|
100,000
80,000
65,000
50,000
|
125,000
115,000
105,000
100,000
|
![BOLT L7.jpg](/wiki/images/2/2f/BOLT_L7.jpg) |
ASTM A320 Grade L7 |
Bolts, Screws, Studs for Low Temperature Service |
AISI 4140 AISI 4142 AISI 4145 |
1/4 thru 2 1/2 |
- |
105,000 |
125,000 |
![BOLT L7A.jpg](/wiki/images/d/d9/BOLT_L7A.jpg) |
ASTM A320 Grade L7A |
Bolts, Screws, Studs for Low Temperature Service |
AISI 4037 |
1/4 thru 2 1/2 |
- |
105,000 |
125,000 |
![BOLT L7B.jpg](/wiki/images/b/b6/BOLT_L7B.jpg) |
ASTM A320 Grade L7B |
Bolts, Screws, Studs for Low Temperature Service |
AISI 4137 |
1/4 thru 2 1/2 |
- |
105,000 |
125,000 |
![BOLT L7C.jpg](/wiki/images/f/f0/BOLT_L7C.jpg) |
ASTM A320 Grade L7C |
Bolts, Screws, Studs for Low Temperature Service |
AISI 8740 |
1/4 thru 2 1/2 |
- |
105,000 |
125,000 |
![BOLT L43.jpg](/wiki/images/1/13/BOLT_L43.jpg) |
ASTM A320 Grade L43 |
Bolts, Screws, Studs for Low Temperature Service |
AISI 4340 |
1/4 thru 4 |
- |
105,000 |
125,000 |
![BOLT B8.jpg](/wiki/images/d/db/BOLT_B8.jpg) |
ASTM A320 Grade B8 |
Bolts, Screws, Studs for Low Temperature Service |
AISI 304 |
1/4 and larger |
- |
30,000 |
75,000 |
![BOLT B8C.jpg](/wiki/images/c/ca/BOLT_B8C.jpg) |
ASTM A320 Grade B8C |
Bolts, Screws, Studs for Low Temperature Service |
AISI 347 |
1/4 and larger |
- |
30,000 |
75,000 |
![BOLT B8T.jpg](/wiki/images/8/8f/BOLT_B8T.jpg) |
ASTM A320 Grade B8T |
Bolts, Screws, Studs for Low Temperature Service |
AISI 321 |
1/4 and larger |
- |
30,000 |
75,000 |
![BOLT B8F.jpg](/wiki/images/5/5e/BOLT_B8F.jpg) |
ASTM A320 Grade B8F |
Bolts, Screws, Studs for Low Temperature Service |
AISI 303 or AISI 303Se |
1/4 and larger |
- |
30,000 |
75,000 |
![BOLT B8M.jpg](/wiki/images/1/1d/BOLT_B8M.jpg) |
ASTM A320 Grade B8M |
Bolts, Screws, Studs for Low Temperature Service |
AISI 316 |
1/4 and larger |
- |
30,000 |
75,000 |
![BOLT B8 U.jpg](/wiki/images/a/a1/BOLT_B8_U.jpg) |
ASTM A320 Grade B8 |
Bolts, Screws, Studs for Low Temperature Service |
AISI 304 |
1/4 thru 3/4
Over 3/4 thru 1
Over 1 thru 1 1/4
Over 1 1/4thru 1 1/2
|
-
-
-
-
|
100,000
80,000
65,000
50,000
|
100,000
80,000
65,000
50,000
|
![BOLT B8C U.jpg](/wiki/images/3/32/BOLT_B8C_U.jpg) |
ASTM A320 Grade B8C |
Bolts, Screws, Studs for Low Temperature Service |
AISI 347 |
1/4 thru 3/4
Over 3/4 thru 1
Over 1 thru 1 1/4
Over 1 1/4thru 1 1/2
|
-
-
-
-
|
100,000
80,000
65,000
50,000
|
100,000
80,000
65,000
50,000
|
![BOLT B8T U.jpg](/wiki/images/7/7e/BOLT_B8T_U.jpg) |
ASTM A320 Grade B8T |
Bolts, Screws, Studs for Low Temperature Service |
AISI 316 |
1/4 thru 3/4
Over 3/4 thru 1
Over 1 thru 1 1/4
Over 1 1/4thru 1 1/2
|
-
-
-
-
|
100,000
80,000
65,000
50,000
|
100,000
80,000
65,000
50,000
|
![BOLT B8F U.jpg](/wiki/images/c/c9/BOLT_B8F_U.jpg) |
ASTM A320 Grade B8F |
Bolts, Screws, Studs for Low Temperature Service |
AISI 321 |
1/4 thru 3/4
Over 3/4 thru 1
Over 1 thru 1 1/4
Over 1 1/4thru 1 1/2
|
-
-
-
-
|
100,000
80,000
65,000
50,000
|
100,000
80,000
65,000
50,000
|
![BOLT B8M U.jpg](/wiki/images/4/4f/BOLT_B8M_U.jpg) |
ASTM A320 Grade B8M |
Bolts, Screws, Studs for Low Temperature Service |
AISI 303 or AISI 303Se |
1/4 thru 3/4
Over 3/4 thru 1
Over 1 thru 1 1/4
Over 1 1/4thru 1 1/2
|
-
-
-
-
|
100,000
80,000
65,000
50,000
|
100,000
80,000
65,000
50,000
|
![BOLT 3A.jpg](/wiki/images/4/46/BOLT_3A.jpg) |
SAE J429 Grade 5 |
Bolts, Screws, Studs |
Medium Carbon Steel, Quenched and Tempered |
1/4 thru 1
Over 1 thru 1 1/2
|
85,000
74,000
|
92,000
81,000
|
120,000
105,000
|
![BOLT 3A.jpg](/wiki/images/4/46/BOLT_3A.jpg) |
ASTM A449 |
Bolts, Screws, Studs |
Medium Carbon Steel, Quenched and Tempered |
1/4 thru 1
Over 1 thru 1 1/2Over 1 1/2 thru 3
|
85,000
74,000
55,00
|
92,000
81,000
58,000
|
120,000
105,000
90,000
|
![BOLT 3B.jpg](/wiki/images/f/fe/BOLT_3B.jpg) |
SAE J429 Grade 5.1 |
Sems |
Low or Medium Carbon Steel, Quenched and Tempered |
#6 thru 3/82 |
85,000 |
- |
120,000 |
![BOLT 3C.jpg](/wiki/images/d/d7/BOLT_3C.jpg) |
SAE J429 Grade 5.2 |
Sems |
Low Carbon Martensitic Steel, Quenched and Tempered |
1/4 thru 1 |
92,000 |
- |
120,000 |
![BOLT A325.jpg](/wiki/images/0/0a/BOLT_A325.jpg) |
ASTM A325 Type 1 |
High Strength Structural Bolts |
Medium Carbon Steel, Quenched and Tempered |
1/2 thru 1
1 1/8 thru 1 1/2
|
85,000
74,000
|
92,000
81,000
|
120,000
105,000
|
![BOLT A325 3C.jpg](/wiki/images/0/09/BOLT_A325_3C.jpg) |
ASTM A325 Type 2 |
High Strength Structural Bolts |
Low Carbon Martensitic Steel, Quenched and Tempered |
1/2 thru 1 |
85,000 |
92,000 |
120,000 |
![BOLT A325 U.jpg](/wiki/images/e/e4/BOLT_A325_U.jpg) |
ASTM A325 Type 2 |
High Strength Structural Bolts |
Atmospheric Corrosion Resistant Steel, Quenched and Tempered |
1/2 thru 1
1 1/8 thru 1 1/2
|
85,000
74,000
|
92,000
81,000
|
120,000
105,000
|
![BOLT BB.jpg](/wiki/images/d/dc/BOLT_BB.jpg) |
ASTM A354 Grade BB |
Bolts, Studs |
Alloy Steel, Quenched and Tempered |
1/4 thru 2 1/2
2 3/4 thru 4
|
80,000
75,000
|
83,000
78,000
|
105,000
100,000
|
![BOLT BC.jpg](/wiki/images/9/95/BOLT_BC.jpg) |
ASTM A354 Grade BC |
Bolts, Studs |
Alloy Steel, Quenched and Tempered |
1/4 thru 2 1/2
2 3/4 thru 4
|
105,000
95,000
|
109,000
99,000
|
125,000
115,000
|
![BOLT 5A.jpg](/wiki/images/b/bc/BOLT_5A.jpg) |
SAE J429 Grade 7 |
Bolts and Screws |
Medium Carbon Alloy Steel, Quenched and Tempered |
1/4 thru 1 1/2 |
105,000 |
115,000 |
133,000 |
![BOLT 6A.jpg](/wiki/images/f/f6/BOLT_6A.jpg) |
SAE J429 Grade 8 |
Bolts, Screws, Studs |
Alloy Steel, Quenched and Tempered |
1/4 thru 1 1/2 |
120,000 |
130,000 |
150,000 |
![BOLT 6A.jpg](/wiki/images/f/f6/BOLT_6A.jpg) |
ASTM A354 Grade BD |
Bolts, Screws, Studs |
Alloy Steel, Quenched and Tempered |
1/4 thru 1 1/2 |
120,000 |
130,000 |
150,000 |
![BOLT NO MARK.jpg](/wiki/images/5/5c/BOLT_NO_MARK.jpg) |
SAE J429 Grade 8.1 |
Studs |
Medium Carbon Alloy or SAE 1041 Modified Elevated Temperature Drawn Steel |
1/4 thru 1 1/2 |
120,000 |
130,000 |
150,000 |
![BOLT A490.jpg](/wiki/images/6/65/BOLT_A490.jpg) |
ASTM A490 |
High Strength Structural Bolts |
Alloy Steel, Quenched and Tempered |
1/2 thru 1 1/2 |
120,000 |
130,000 |
150,000 min
170,000 max
|
![BOLT NO MARK.jpg](/wiki/images/5/5c/BOLT_NO_MARK.jpg) |
ISO R898 Class 4.6 |
Bolts, Screws, Studs |
Low or Medium Carbon Steel, Quenched and Tempered |
All Sizes thru 1 1/2 |
33,000 |
36,000 |
60,000 |
![BOLT NO MARK.jpg](/wiki/images/5/5c/BOLT_NO_MARK.jpg) |
ISO R898 Class 5.8 |
Bolts, Screws, Studs |
Low or Medium Carbon Steel, Quenched and Tempered |
All Sizes thru 1 1/2 |
55,000 |
57,000 |
74,000 |
![BOLT 88.jpg](/wiki/images/e/e4/BOLT_88.jpg) |
ISO R898 Class 8.8 |
Bolts, Screws, Studs |
Medium Carbon Steel, Quenched and Tempered |
All Sizes thru 1 1/2 |
85,000 |
92,000 |
120,000 |
![BOLT 109.jpg](/wiki/images/e/ea/BOLT_109.jpg) |
ISO R898 Class 10.9 |
Bolts, Screws, Studs |
Medium Carbon Steel, Quenched and Tempered |
All Sizes thru 1 1/2 |
120,000 |
130,000 |
150,000 |