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Steel Interchange


Tension Control Bolts
Per AISC 358-05 Section 4.1, “Bolts shall be pretensioned high-strength bolts conforming to ASTM A325 or A490. Twist-off type tension control bolt assemblies of equivalent mechanical properties and chemical composition may be substituted for A325 or A490 fastener assemblies.” Do ASTM F1852 bolts have mechanical properties and chemical compositions comparable to A325 and A490 bolts?

Answer
Yes, for ASTM A325; no, for ASTM A490. ASTM F1852 is the tension-control bolt equivalent to the ASTM A325 conventional bolt. This is discussed in the Commentary to Section 2.7.2 of the 2004 RCSC Specification (a free download at www.boltcouncil.org). That Commentary also discusses the use of tension-control bolts with mechanical properties equivalent to ASTM A490 bolts. Subsequent to the publication of the 2004 RCSC Specification, ASTM developed the ASTM F2280 standard as a TC equivalent to the ASTM A490 conventional bolt.

Kurt Gustafson, S.E., P.E.

Posted on August 1, 2010


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