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 On Mar 15, 2012, at 9:40 AM, Allan Sindelar wrote: > Lars, > 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. > Allan > > Allan Sindelar > 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 > > >
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