What are the marking requirements for A449 bolts?
The ASTM A449 specification is somewhat ambiguous when it comes to the marking requirements. While the requirements are perfectly clear for hex bolts and studs, the verbiage doesn’t address head styles other than hex head, other bolt configurations such as U-bolts, or rods with threads on each end.
ASTM A449, Section 16.1, Manufacturers Identification reads as follows: “All hex cap screws and bolts and one end of studs 3/8″ in. and larger… shall be marked by the manufacturer with a unique identifier to identify the manufacturer…”
ASTM A449, Section 16.2.1, Type Identification reads similarly: “Type 1 hex cap screws and bolts and one end of Type 1 studs… shall be marked ‘A449’.”
The reasons bolts require marking is so that they are easily visually identifiable by the end user. While the wording in the specification may technically only address hex bolts and studs, logic would dictate the marking requirement would also extend to other configurations such as U-Bolts, headed bolts with different head styles, and rods with threads on each end.