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RE: A36 Bolts[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaoc '" <seaoc(--nospam--at)seaoc.org>
- Subject: RE: A36 Bolts
- From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
- Date: Tue, 23 Sep 1997 14:00:00 -0500
A36 material and A307 material are the same. The only difference is that A307 bolts are manufactured in large lots per ANSI specifications and theoretically A307 bolts are tested. In reality most (95% or greater) A307 anchor bolts are manufactured from A36 material and are not tested because of the small lot size. Standard A307 anchor bolts are difficult to find in lengths greater than 10 inches. The industry practice is to manufacture A307 anchor bolts by threading and hot heading the head, and testing is ignored. Because of the small difference in allowable stresses the problem is more academic than real, but I still prefer to thread both ends of an A36 rod and deform the threads on the anchored end. The weak link on most bolts is the head, and I don't have to worry about the integrity of an untested hot headed anchor bolt. By the way, hot heading is the process by which the end of the bolt is heated to cherry red. The end is impacted to flare. Then the shoulders are sheared off to form the hex head. The wedge test (the test for bolt head integrity) is an optional physical test of the bolt. Regards, Harold Sprague Black & Veatch ---------- From: Liu, Shu-Shang To: 'seaoc(--nospam--at)seaoc.org' Subject: A36 Bolts Date: Tuesday, September 23, 1997 11:01AM I am reviewing a design. The designer uses A36 anchor bolts for anchoring large diameter butterfly valves in a high seismic area. I have not seen people use A36 for anchor bolts. Is A36 suitable for making bolts?
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