I did the pullout calculations for 5/16-18 bolts last year and found that to be plenty good. After drill/tap 72 holes with a magnetic chuck drill I won't ever do it again. It's way too labor intensive. And the 24 thread pitch, which would have been stronger, was not available in stainless so we used 18TPI.
Jim Duncan From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Allan Sindelar Sent: Thursday, March 15, 2012 10:17 PM To: RE-wrenches Subject: Re: [RE-wrenches] No underside access metal biulding attachment Yeah, Jay, I think Dynamic Fastener is where I saw the pull-out chart. I believe that 1/4" is equivalent to #14 - can anyone verify this? So the question (to which I don't know the answer) becomes: in heavy gauge steel (Lars mentioned "about 1/8"), will a 1/4 x 20 machine thread resist pullout better than a Tek thread? There would be more threads in the material with the machine thread, but the thread's major diameter is much smaller than the thread of the Tek screw. Allan Allan Sindelar <mailto:al...@positiveenergysolar.com> al...@positiveenergysolar.com NABCEP Certified Photovoltaic Installer NABCEP Certified Technical Sales Professional New Mexico EE98J Journeyman Electrician Positive Energy, Inc. 3201 Calle Marie Santa Fe, New Mexico 87507 505 424-1112 www.positiveenergysolar.com <http://www.positiveenergysolar.com/> On 3/15/2012 8:53 PM, jay peltz wrote: Hi Allan, I get 1/4 x 20 self taping screws from. I think they are even stronger than the TEK screws. dynamicfasterner.com Jay Peltz power
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