| Identification Grade Mark | Specification | Fastener Description | Material | Nominal Size Range (in.) | Mechanical Properties | ||
| Proof Load (psi) | Yield Strength Min (psi) | Tensile Strength Min (psi) | |||||
 No Grade Mark | SAE J429 Grade 1 | Bolts, Screws, Studs | Low or Medium Carbon Steel | 1/4 thru 1-1/2 | 33,000 | 36,000 | 60,000 |
| ASTM A307 Grades A&B | Low Carbon Steel | 1/4 thru 4 | — | — | |||
| SAE J429 Grade 2 | Low or Medium Carbon Steel | 1/4 thru 3/4 Over 3/4 to 1-1/2 | 55,000 33,000 | 57,000 36,000 | 74,000 60,000 | ||
 No Grade Mark | SAE J429 Grade 4 | Studs | Medium Carbon Cold Drawn Steel | 1/4 thru 1-1/2 | — | 100,000 | 115,000 |
 B5 | ASTM A193 Grade B5 | AISI 501 | 1/4 Thru 4 | — | 80,000 | 100,000 | |
 B6 | ASTM A193 Grade B6 | AISI 410 | 85,000 | 110,000 | |||
 B7 | ASTM A193 Grade B7 | AISI 4140, 4142, OR 4105 | 1/4 thru 2-1/2 Over 2-1/2 thru 4 Over 4 thru 7 | — — — | 105,000 95,000 75,000 | 125,000 115,000 100,000 | |
 B16 | ASTM A193 Grade B16 | CrMoVa Alloy Steel | 105,000 95,000 85,000 | 125,000 115,000 100,000 | |||
 B8 | ASTM A193 Grade B8 | AISI 304 | 1/4 and larger | — | 30,000 | 75,000 | |
 B8C | ASTM A193 Grade B8C | AISI 347 | |||||
 B8M | ASTM A193 Grade B8M | AISI 316 | |||||
 B8T | ASTM A193 Grade B8T | Bolts, Screws, Studs for High-Temperature Service | AISI 321 | 1/4 and larger | — | 30,000 | 75,000 |
 B8 | ASTM A193 Grade B8 | AISI 304 Strain Hardened | 1/4 thr 3/4 Over 3/4 thru 1 Over 1 thru 1-1/4 Over 1-1/4 thru 1-1/2 | — — — — | 100,000 80,000 65,000 50,000 | 125,000 115,000 105,000 100,000 | |
 B8C | ASTM A193 Grade B8C | AISI 347 Strain Hardened | |||||
 B8M | ASTM A193 Grade B8M | AISI 316 Strain Hardened | 95,000 80,000 65,000 50,000 | 110,000 100,000 95,000 90,000 | |||
 B8T | ASTM A193 Grade B8T | AISI 321 Strain Hardened | 100,000 80,000 65,000 50,000 | 125,000 115,000 105,000 100,000 | |||
 L7 | ASTM A320 Grade L7 | Bolts, Screws, Studs for Low-Temperature Service | AISI 4140, 4142 or 4145 | 1/4 thru 2-1/2 | — | 105,000 | 125,000 |
 L7A | ASTM A320 Grade L7A | AISI 4037 | |||||
 L7B | ASTM A320 Grade L7B | AISI 4137 | |||||
 L7C | ASTM A320 Grade LC7 | AISI 8740 | |||||
 L43 | ASTM A320 Grade L43 | AISI 4340 | 1/4 thru 4 | — | 105,000 | 125,000 | |
 B8 | ASTM A320 Grade B8 | Bolts, Screws, Studs for Low-Temperature Service | AISI 304 | 1/4 and larger | — | 30,000 | 75,000 |
 B8C | ASTM A320 Grade B8C | AISI 347 | |||||
 B8T | ASTM A320 Grade B8T | AISI 321 | |||||
 B8F | ASTM A320 Grade B8F | AISI 303 or 303Se | |||||
 B8M | ASTM A320 Grade B8M | AISI 316 | |||||
 B8 | ASTM A320 Grade B8 | AISI 304 | 1/4 thru 3/4 Over 3/4 thru 1 Over 1 thru 1-1/4 Over 1-1/4 thru 1-1/2 | — — — — | 100,000 80,000 65,00 50,00 | 100,000 80,000 65,00 50,00 | |
 B8C | ASTM A320 Grade B8C | AISI 347 | |||||
 B8F | ASTM A320 Grade B8F | AISI 303 or 303Se | |||||
 B8M | ASTM A320 Grade B8M | AISI 316 | |||||
 B8T | ASTM A320 Grade B8T | AISI 321 | |||||
 | SAE J429 Grade 5 | Bolts, Screws, Studs | Medium Carbon Steel, Quenched and Tempered | 1/4 thru 1 Over 1 to 1-1/2 | 85,000 74,000 | 92,000 81,000 | 120,000 105,000 |
| ASTM A449 | 1/4 thru 1 Over 1 to 1-1/2 Over 1-1/2 thru 3 | 85,000 74,000 55,000 | 92,000 81,000 58,000 | 120,000 105,000 90,000 | |||
 | SAE J429 Grade 5.1 | Sems | Low or Medium Carbon Steel, Quenched and Tempered | No. 6 thru 3/8 | 85,000 | — | 120,000 |
 | SAE J429 Grade 5.2 | Bolts, Screws, Studs | Low Carbon Martensitic Steel, Quenched and Tempered | 1/4 thru 1 | 85,000 | 92,000 | 120,000 |
 A325 | 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 |
 A325 | ASTM A325 Type 2 | Low Carbon Martensitic Steel, Quenched and Tempered | 1/2 thru 1 | 85,000 | 92,000 | 120,000 | |
 A325 | ASTM A325 Type 3 | Atmospheric Corrosion Resisting 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 | |
 BB | 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 |
 BC | ASTM A354 Grade BC | 105,000 95,000 | 109,000 99,000 | 125,000 115,000 | |||
 | SAE J429 Grade 7 | Bolts, Screws, | Medium Carbon Alloy Steel, Quenched and Tempered 4 | 1/4 thru 1-1/2 | 105,000 | 115,000 | 133,000 |
 | SAE J429 Grade 8 | Bolts, Screws, Studs | Medium Carbon Alloy Steel, Quenched and Tempered | 1/4 thru 1-1/2 | 120,000 | 130,000 | 150,000 |
| ASTM A354 Grade BD | Alloy Steel, Quenched and Tempered 4 | ||||||
 No Grade Mark | 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 |
 A490 | 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 |
 No Grade Mark | ISO R898 Class 4.6 | Bolts, Screws, Studs | Medium Carbon Steel, Quenched and Tempered | All Sizes thru 1-1/2 | 33,000 | 36,000 | 60,000 |
 No Grade Mark | ISO R898 Class 5.8 | 55,000 | 57,000 | 74,000 | |||
8.8 or  88 | ISO R898 Class 8.8 | Alloy Steel, Quenched and Tempered | 85,000 | 92,000 | 120,000 | ||
10.9 or  109 | ISO R898 Class 10.9 | 120,000 | 130,000 | 150,000 | |||
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