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Bolt Grade Rating

Bolt Grade Rating

SAE Grade No.

Size Range

Tensile Strength

Material

Head Marking

Grade 2

¼” thru ¾”

⅞” thru 1 ½”

74,000 psi

60,000 psi

Low or medium carbon steel.

grade 2 bolt 2d

Grade 3

¼” thru ¾”

110,000 psi

Medium carbon steel

grade 3 bolt 2d

Grade 5

¼” thru 1”

120,000 psi

Medium carbon steel, quenched & tempered

grade 5 bolt

Grade 5.1

¼” thru ½”

120,000 psi

Lor or medium carbon steel, quenched & tempered

grade 5.1 bolt

Grade 6

¼” thru 1”

140,000 psi

Medium carbon steel, quenched & tempered

grade 6 bolt

Grade 8

¼” thru 1 ½”

150,000 psi

Medium carbon alloy steel, quenched & tempered

grade 8 bolt




Bolt Grade Rating psi Chart

bolt grade rating psi chart
PSI chart
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