ASTM Grades Steel Bolts

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ASTM Designation	Head Marking	Size Range (in)	Minimum Proof Strength (103 psi)	Minimum Tensile Strength (103 psi)	Material
A307		1/4 - 4			Low carbon steel
A325 type 1		1/2 - 1 1 1/8 - 1 1/2	85 74	120 105	Medium carbon steel, Q & T
A325 type 2		1/2 - 1 1 1/8 - 1 1/2	85 74	120 105	Low carbon martensite steel, Q & T
A325 type 3		1/2 - 1 1 1/8 - 1 1/2	85 74	120 105	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	85 74 55	120 105 90	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) = 6,894.8 Pa (N/m²)

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