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