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Tension Stength Yield Strength Enlogation Length ksi ksi % in. Brinell Rockwell B 3*D 121-241HRB 69-100HRB 3*D 241max 100max 3*D 121-212 69-95 3*D 212max 95max ASTM A307 Head Marking Hardness 60-100 -- 18 GR.B (heavy hex bolt) 60min -- ASTM A307 Mechanical Properties and Head Marking Standard for Bolt Grade 18 GR.A (hex head bolt)

1. astm a307 mechanical properties and head marking

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Tension Stength

Yield Strength

Enlogation Length

ksi ksi % in. Brinell Rockwell B

<3*D 121-241HRB 69-100HRB

≥3*D 241max 100max

<3*D 121-212 69-95

≥3*D 212max 95max

ASTM A307

Head MarkingHardness

60-100 -- 18GR.B (heavy hex bolt)

60min --

ASTM A307 Mechanical Properties and Head Marking

Standard for Bolt

Grade

18GR.A (hex head bolt)

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