Does anyone manufacture A325 heavy hex bolts above 1-1/2” diameter?

The simple answer is no. Per the ASTM A325 specification, the diameter range allowed is 1/2″ through 1-1/2″. Not only do A325s not exist above 1-1/2” diameter, but they cannot be manufactured either. The reason for this is that there are no dimensional or mechanical requirements for A325s larger than 1-1/2″. If a bolt is needed similar in strength to an A325, ASTM recommends A449, which covers diameters through 3″. It is common to see A325s specified above 1-1/2″ diameter because of their strength, so be sure to consult an engineer to see what ASTM grade is actually needed. If a distributor or manufacturer is saying that they can supply an A325 in diameters above 1-1/2″, they are incorrect and you may be liable for their mistake.

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