To use a 1/4" fastener with an L-foot mounting slot that's bigger, one could use a "shoulder washer" or a "flange bushing". Those might be good search terms to use at, say, mcmaster.com
One must wonder if the pull-out resistance of the 1/4" Tek screw is adequate for the wind-loading etc. There's some math to be done which may point to the need for bigger diameter screws anyway. Jolliness, Mick Abraham, Proprietor www.abrahamsolar.com Voice: 970-731-4675 On Fri, Oct 23, 2009 at 9:18 AM, jay peltz <j...@asis.com> wrote: > HI Guys, > > Check out dynamic fastener, > > they have a lot of great stuff. > > Including self drilling 1/4x 20 SS screws and larger. > > jay > > peltz power > > On Oct 23, 2009, at 3:12 AM, Carl Adams wrote: > > Hello Wrenches, >> >> Pulling up this thread from earlier in the year. I have a couple of >> upcoming jobs where I am attaching PV mounting structure as follows >> Job 1) LFoot to metal roof into Z purlin, and Job 2) FastJack to metal >> roof into bar joist. >> >> In both of the applications I'm considering the Tek screw type >> attachment to the building steel. Both the L foot and FastJack are >> sized for a 5/16 - 3/8 lag or bolt. Most of the self tappers I see >> are 1/4" max diameter. Should I be concerned about the undersized fit >> of the fastener in the mounting attachment or are there large Tek type >> screws out there I'm not finding? >> >> Does anyone have pullout strengths for this type of attachment? >> >> With Regards >> Carl Adams >> NABCEP Certified PV Installer >> SunRock Solar, LLC >> >> On Thu, Feb 5, 2009 at 6:51 PM, Peter Parrish >> <peter.parr...@calsolareng.com> wrote: >> >>> Does anyone have a source for stainless steel, self tapping Tek screws? I >>> could use some #10/3-4 and #10/1-1/2. If they have the little cap and >>> neoprene washer that would be even better! >>> >>> - Peter >>> >>> Peter T. Parrish, President >>> California Solar Engineering, Inc. >>> 820 Cynthia Ave., Los Angeles, CA 90065 >>> Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 >>> CA Lic. 854779, NABCEP Cert. 031806-26 >>> peter.parr...@calsolareng.com >>> >>> >>> _______________________________________________ >>> List sponsored by Home Power magazine >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> >>> Options & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> List-Archive: >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> >>> List rules & etiquette: >>> www.re-wrenches.org/etiquette.htm >>> >>> Check out participant bios: >>> www.members.re-wrenches.org >>> >>> >>> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Options & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out participant bios: >> www.members.re-wrenches.org >> >> > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > >
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