Can a carriage bolt be supplied to the A325 specification?
Technically, carriage bolts cannot be manufactured to the A325 specification. The A325 specification in section 1.1 states, “This specification covers two types of quench and tempered steel heavy hex structural bolts.” Section 1.5 states, “This specification is applicable to heavy hex structural bolts only. For bolts with other configurations and thread lengths with similar mechanical properties see A449”.
Therefore, to order carriage bolts with A325 chemical and mechanical properties, you would order to the ASTM A449 specification. The ASTM A449 and A325 specifications share virtually identical chemical and mechanical requirements.