This bolt spec is the most commonly used for any general application for bolting. This bolt spec is for bolts, anchor bolts and studs that have a minimum tensile strength of 60 KSI and these bolts are used for general applications.


A Headed bolts, threaded rods and bent bolts intended for general applications.
B Heavy hex bolts and studs intended for flanged joints in piping systems with cast iron flanges.
C Nonheaded anchor bolts, either bent or straight, intended for structural anchorage purposes. The end of a grade C anchor bolt intended to project from the concrete will be painted green for identification purposes. Permanent marking is a supplemental requirement.

Chemical Properties

Element Grade A Grade B
Carbon, max 0.29% 0.29%
Manganese, max 1.20% 1.20%
Phosphorus, max 0.04% 0.04%
Sulfur, max 0.15% 0.05%


A563 Grade A hex (NOT HEAVY HEX)


All A307A Bolts are to be used with standard F844 Washers (SAE + USS)

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