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Steel Bolts - ASTM Grades

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Steel Bolts - ASTM Grades
ASTM DesignationHead MarkingSize Range
Minimum Proof Strength
(103 psi)
Minimum Tensile Strength
(103 psi)
A307 1/4 - 4     Low carbon steel
A325 type 1 1/2 - 1
1 1/8 - 1 1/2
Medium carbon steel, Q & T
A325 type 2 1/2 - 1
1 1/8 - 1 1/2
Low carbon martensite steel, Q & T
A325 type 3 1/2 - 1
1 1/8 - 1 1/2
Weathering steel, Q & T
A354 grade BC       Alloy steel, Q & T
A354 grade BD 1/4 - 4 120 150 Alloy steel, Q & T
A449 1/4 - 1
1 1/8 - 1 1/2
1 3/4 - 3
Medium carbon steel, Q & T
A490 type 1 1/2 - 1 1/2 120 150 Alloy steel, Q & T
A490 type 3       Weathering steel, Q & T
  • 1 psi (lb/in2) = 6895 Pa (N/m2)
  • 1 inch = 25.4 mm
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