[RE-wrenches] No underside access metal biulding attachment

[Solarguy]

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-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at 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:Allan at positiveenergysolar.com> Allan at 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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