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RE: A325 Anchor rods?

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ASTM A325 is a bolt specification and not a bolt MATERIAL specification. As such it is limited to a maximum diameter of 1 1/2 inch and manufacturers will make them up to a maximum of 6 inches in length unless there is a special order.

A325 bolts are manufactured to the dimensions in ANSI B18.2.1 and as such will only have a maximum thread length of 2.25 inches for a 1 1/2 inch diameter bolt. This, too, is generally inadequate for structural anchor rod purposes. An A325 T bolt can be specified which will have threads along the entire shaft, but it is generally a special order.

I have heard of longer "A325" bolts, but the manufacturers will hot head the bolts which is not a good thing to do for an anchor rod in tension. The process creates a weak point at the head to shaft intersection.

Unfortunately specifying A325 anchor bolts is a very common error on the part of engineers.

Some years ago I observed that one of the tallest buildings in Los Angeles had 4 inch diameter A325 anchor bolts specified. It is a common error.

In answer to your specific questions:
Is A325 another valid option for anchor rods? No
Have I just learned something new? No
Have you come across this specification for anchor
rods any time in the past? Unfortunately yes.

Feel free to forward my e-mail to the structural engineer. You just saved him from a lurking lawyer just waiting to pounce.

Harold Sprague

From: G Vishwanath <gvshwnth(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: steel steel <steel-detail(--nospam--at)>, seaint(--nospam--at)
Subject: A325 Anchor rods?
Date: Tue, 28 Mar 2006 01:30:53 -0800 (PST)


I have come across  A307, A36 and F1554 as specs for
Anchor rods.

The structural dwg in a current project indicates
A325 for anchor rods.
I presumed it was a slip but still indicated A325 in
the AB dwg, clouded it and asked for verification.
I also sent a mail to our fabricator on this subject.
The engineer has confirmed A325 for Anchor bolts while
commenting on our dwg.

Is A325 another valid option for anchor rods?
Have I just learned something new?
Have you come across this specification for anchor
rods any time in the past?

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