Does F1554 allow for square head bolts or head styles other than hex or heavy hex?

The specification only mentions heavy hex or hex head bolts conforming to the dimensional requirements of B18.2.1, which is the ASME dimensional specification for hex bolts and heavy hex bolts. Portland Bolt manufactures F1554 square head anchor bolts on a regular basis, but any other head style would be unusual, but possible, and would need to be discussed before manufacturing.

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