My plans specify A36M55. Is that a bolt grade?

A36M55 is an outdated call out for anchor bolts primarily used by the light pole and traffic signal industries. It was used to specify ASTM A36 steel (36 ksi yield strength) that had been chemically modified to develop a minimum 55 ksi yield strength. In 1994 the F1554 specification was introduced, and F1554 Grade 55 rendered the A36M55 designation obsolete.

F1554 Grade 55 anchor bolts use the exact same steel as A36M55, but like all finished fastener specifications provides some additional details such as recommended nuts, marking requirements, and application. For more information refer to this FAQ: Steel vs. Fastener Specifications.

Portland Bolt’s 85,000 square foot manufacturing and galvanizing facility is equipped to produce anchor bolts in a variety of grades, configurations, and sizes. If your project requires anchor bolts of any kind, give one of our experienced salespeople a call today and we will be happy to help you out.



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