ASTM A307
Jun 15,2018

Standar for Bolt

Grade

Tension Stength

Yield Strength

Enlogation

Length

Hardness

Head Marking

ksi

ksi

%

in.

Brinell

Rockwell B

A307

GR.A (hex head bolt)

60min

--

18

<3*D

121-241HRB

69-100HRB

≥3*D

241max

100max

GR.C

58-80

36

23

/

/

/


GR.B (heavy hex bolt)

60-100

--

18

<3*D

121-212

69-95HRB

≥3*D

212max

95max

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