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Q: Hot-Dip Galvanizing of A 307 Bolts and Related Nuts

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I have a job going for purchasing. I got shop drawings on miscellaneous steel which will be connected to some timber members using A 307 bolts.


The bolts were shown on the shop drawings as “hot-dip galvanized.” I changed it to read “mechanically galvanized.” Now the supplier claims it will take them over a week to get those.


The contractor wants me to “handle it” (implying “use hot-dip galvanized bolts”). I am uncomfortable with this because of past reading where hot-dip galvanizing of bolts caused fit-up problems and heat-related problems with the bolt material.


However, A 307 is not considered “high strength” I believe, so it may be all right to hot-dip galvanize.

Comments, please.


William L. Polhemus, Jr. P.E.

Polhemus Engineering Company

Katy, Texas USA