Posted by Mark-IA on August 03, 2018 at 18:15:07 from (67.55.246.108):
In Reply to: Shear bolt posted by 550Doug on August 03, 2018 at 14:44:58:
Grade 2 Bolts
Grade 2 bolts are the most common grade of bolts and are also the least expensive. Grade 2 bolts are found mostly in household fasteners like carriage bolts, and machine screws. The usually have no head marking, but may sometimes contain manufacturer markings.
Grade 5 bolts are commonly found in many automotive applications that call for a hardened bolt but not as brittle as fully hardened. Grade 5 bolts are case hardened, meaning the bolt has been heated enough to hardened the outside of the bolt but not enough to harden the inside portion. Grade 5 bolts are identified by 3 evenly spaced radial lines on the head.
Intense amount of weight or pressure Grade 8 Bolts
Grade 8 bolts are common in heavy manufacturing like large trucks and tractors. They are fully heat treated all the way through which create a bolt that is very hard but somewhat brittle. Because of their hardness, grade 8 bolts are more likely to snap off than bend under extreme loads. Grade 8 bolts are identifiable by 6 evenly spaced radial lines on the head
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