Tag Archives: headed bolts

A325X vs. A325 Bolt Head Markings

Do A325X bolts have a special marking on the head that would differentiate them from a standard A325?

The “X” designates the connection type (bearing-type connection with threads excluded from the shear plane) and has nothing to do with the bolt itself. Therefore, an A325 structural bolt used in this type of connection will have no different markings than an A325 bolt used in a different type of connection (N or SC). All A325... Read more

Fastener Substitution Liability

What are the liability issues involved in substituting one fastener grade or configuration for another?

Have you ever had a fastener company try and talk you into substituting A193 grade B7 all thread rod for F1554 grade 55 anchor rods, claiming it’s “better?” Have you allowed them to substitute an all thread rod with a nut tack welded in lieu of a headed bolt? These are scenarios that come up... Read more

Headed Bolts vs Rod with a Nut

Can a rod with a welded nut be substituted for a bolt with a forged head?

When a rod with a nut is substituted for a bolt with a forged head, two issues come into play. In-house mechanical testing performed by Portland Bolt on headed bolts versus rods with a nut, both from the identical lots of steel, the rod with a nut developed up to 12% less strength than the... Read more