| Grade Marking | Specification | Material | Nominal Size Inches | Proof Load Stress ksi | Yield Strength Min, ksi | Tensile Strength Min, ksi |
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 | SAE J429 - Grade 1 | Low or Medium Carbon Steel | 1/4 through 11/2 | 33 | 36 | 60 |
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| SAE J429 - Grade 2 | 1/4 3/4 over 3/4 11/2 | 55 / 33 | 57 / 36 | 74 / 60 |
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 | ASTM A307 - Grade A | 1/4 through 4 | | | 60 |
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| ASTM A307 - Grade B | 1/4 through 4 | | | 60 / 100 |
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| ASTM A307 - Grade C | Props. conforms to A36 | 1/4 through 4 | | 36 | 58 / 80 |
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 | SAE J429 - Grade 5ASTM A449 - Type 1 | Medium Carbon Steel, Quenched and Tempered | 1/4 through 1 over 1 through 11/2 | 85 74 | 92 81 | 120 105 |
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| ASTM A449 - Type 1 | over 11/2 through 3 | 55 | 58 | 90 |
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 | ASTM A325 - Type 1 | Medium Carbon Steel, Quenched and Tempered | 1/2 through 1 over 1 through 11/2 | 85 74 | 92 81 | 120 105 |
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 | ASTM A325 - Type 2 | Low Carbon Martensite Steel, Quenched and Tempered |
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 | ASTM A325 - Type 3 | Atmospheric Corrosion Resistant Steel, Quenched and Tempered |
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 | ASTM A193 - B7 |
| 1/4 through 21/2 over 21/2 through 4 over 4 through 7 | 105 95 75 | 105 95 75 | 125 115 100 |
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 | ASTM A193 - B8 Class 1 | AISI 304 High Temperature Service | 1/4 and larger | | 30 | 75 |
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| ASTM A320 - B8 Class 1 | AISI 304 High Temperature Service | 1/4 and larger | | 30 | 75 |
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 | ASTM A193 - B8M Class 1 | AISI 316 High Temperature Service | 1/4 and larger | | 30 | 75 |
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| ASTM A320 - B8M Class 1 | AISI 316 High Temperature Service | 1/4 and larger | | 30 | 75 |
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 | ASTM A324 - Grade BC | Medium Carbon Alloy Steel, Quenched and Tempered | 1/4 through 21/2 over 21/2 through 4 | 105 95 | 109 99 | 125 115 |
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 | SAE J429 - Grade 8 | Medium Carbon Alloy Steel, Quenched and Tempered | 1/4 through 11/2 | 120 | 130 | 150 |
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| ASTM A320 - B8M Class 1 | 1/4 through 21/2 over 21/2 through 4 | 120 105 | 130 115 | 150 140 |
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 | ASTM A490 - Type 1 | Medium Carbon Alloy Steel, Quenched and Tempered | 1/2 through 11/2 | 120 | 130 | 150-170 |
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 | ASTM A490 - Type 1 | Atmospheric Corrosion Resistant Steel, Quenched and Tempered | 1/2 through 11/2 | 120 | 130 | 150-170 |
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 | ISO R898 - Class 8.8 | Alloy Steel, Quenched and Tempered | all sizes through 11/2 | 85 | 92 | 120 |
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 | ISO R898 - Class 10.9 | Alloy Steel, Quenched and Tempered | all sizes through 11/2 | 120 | 130 | 150 |