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

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Title: Message
I've specified hot-dip galvanized A307 anchor bolts for years and never heard of a problem with the material properties (A307 is similar to A36 steel).
ASTM F1554 refers to "mechanically deposited" zinc as well as hot dip galvanizing of anchor bolts. Mechanical deposition is in accordance with "Class 50 of Specification B 695".

William C. Sherman, PE
(Bill Sherman)
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)

-----Original Message-----
From: Bill Polhemus [mailto:bill(--nospam--at)]
Sent: Monday, December 08, 2003 10:10 AM
To: seaint(--nospam--at)
Subject: Q: Hot-Dip Galvanizing of A 307 Bolts and Related Nuts

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