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Steel Bolts - SAE Grades

SAE steel bolts - grades ranging grade 1 to 8.2 - proof and tensile strength

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SAE Grade	Size Range (in)	Minimum Proof Strength (10³ psi)	Minimum Tensile Strength (10³ psi)	Material
1	1/4 - 1 1/2			Low - medium carbon steel
2	1/4 - 3/4 7/8 - 1 1/2	55 33	74 60	Low - medium carbon steel
5	1/4 - 1 1 1/8 - 1 1/2	85 74	120 105	Medium carbon steel, Q & T
5.2	1/4 - 1	85	120	Low carbon martensite steel, Q & T
7	1/4 - 1 1/2	105	133	Medium carbon alloy steel, Q & T
8	1/4 - 1 1/2	120	150	Medium carbon alloy steel, Q & T
8.2	1/4 - 1	120	150	Low carbon martensite steel, Q & T

1 psi (lb/in²) = 6,894.8 Pa (N/m²)

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