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1. Bolt Size
Tension
Stength
Yield
Strength
Enlogation
in. ksi ksi % Brinell Rockwell C
1/2~1"
<2*D, HB 311-352；
>2*D, HB…-352;
<2*D, 33-39；
>2*D, HB…-39;
1~1-1/2"
<3*D,HB313-352；
>3*D,HB…-352
<2*D, 33-39；
>2*D, HB…-39;
Type1
ASTM
A490
150-173 130min 14
ASTM A490 Mechanical properties and Head marking
Grade
Hardness
Head Marking
Standard
for Bolt
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