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 type 1 bolts are simply marked with “A325” and the manufacturer’s logo. The exceptions are as follows:
|A325 type 3 weathering steel bolts are underlined (A325).|
|Fully threaded A325 structural bolts are designated with a “T” (A325T).|