<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Allan,<div><br></div><div>I get 1/4 x 20 self taping screws from.</div><div>I think they are even stronger than the TEK screws.</div><div><br></div><div><a href="http://dynamicfasterner.com">dynamicfasterner.com</a></div><div><br></div><div><br></div><div>Jay</div><div><br></div><div>Peltz power</div><div><br></div><div><br><div><div>On Mar 15, 2012, at 9:40 AM, Allan Sindelar wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
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Lars,<br>
This has been addressed before on this list, but its been awhile.
#14 self-tapping ("Tek") screws have phenomenal pull-out strength in
standard steel purlins. My advice is to research this through your
fastener supplier; I have seen charts on pull-out strength of
various sizes and materials. I think you'll find that you can come
up with a screw attachment schedule with which you'll be satisfied.<br>
Allan<br>
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<font face="Times New Roman, Times, serif"><b>Allan Sindelar</b></font><br>
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<span style="font-size: 10pt;">NABCEP Certified Photovoltaic
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