My plans call for an A307 grade C anchor bolt and my supplier is offering F1554 grade 55 anchor bolts as a substitution. Is this acceptable?
Theoretically, this substitution makes sense. However, one should always check with the project engineer before making any alterations to the grade or configuration of product that has been specified for the structure. Please note that for liability reasons, Portland Bolt is not recommending that this substitution be made without appropriate approval.
The A307 grade A and B specifications cover mild steel rods, bent bolts, headed bolts, and flange connection bolts. The A307 Grade C anchor bolt specification, which covered unheaded anchor bolts, was eliminated in August of 2007 and replaced with the F1554 grade 36 anchor bolt specification.
The F1554 grade 36 specification is a more complete specification covering mild steel headed anchor bolts, bent anchor bolts, and straight rods in addition to two other grades of anchor bolts, grade 55 and grade 105. Section 4 of the F1554 specification has a note stating, “When grade 36 is specified, a weldable grade 55 may be furnished at the supplier’s option.” As long as the F1554 grade 55 anchor bolt being supplied in lieu of the A307 grade C anchor bolts is weldable, this is a correct substitution per the ASTM F1554 and A307 specifications.
Theoretically, F1554 grade 36 anchor bolts should be substituted for the obsolete A307 grade C specification and F1554 grade 55 can be substituted for grade 36 at the supplier’s option, as shown below:
A307 grade C ⇒ F1554 grade 36 ⇒ F1554 grade 55
The following chart shows correct and incorrect substitutions.
|A 307 Grade C||F1554 Grade 36||F1554 Grade 55|
|A307 Grade C can be substituted for...||N/A||No||No|
|F1554 Grade 36 can be substituted for...||Yes||N/A||No|
|F1554 Grade 55 can be substituted for...||Yes||Yes||N/A|
|Notes: A307 grade C cannot be substituted for F1554 grade 36 or grade 55 since it is an obsolete specification and F1554 requires additional testing that typically is not performed on A307 anchor bolts. F1554 grade 36 cannot be substituted for F1554 grade 55 since it does not meet the mechanical requirements of the grade 55 version of this specification.|