Nick didn't specify screw diameter, but assuming #10-32:<br><br>Try #96024A310 from McMaster-Carr (<a href="http://www.mcmaster.com">www.mcmaster.com</a>) These cut threads into aluminum pretty well.<br><br>I also use stainless "external star" washers for the ground lug task: #98438A230, same source. One washer between lug and solar module frame bites into both surfaces.<br>
<br>The above mentioned screws require a 5/32" pilot hole. If your modules don't already have that you'll need to protect the Tedlar back sheet with a scrap of wood then drill through the aluminum flange. This operation is possibly non-code, possibly non-acceptable to your authority having jurisdiction, and possibly a reason for the module manufacturer to disallow warranty on the drilled modules. Drama, drama, drama.<br>
<br>A 5/16" hex bit is required to drive the thread cutter screws and I find this cannot be done by hand. A cordless drill works but be careful to not strip out the aluminum threads you're cutting. Get them tight...but not too tight. <br>
<br>Side Note: The same screws do not tap well into the thin NEMA 1/NEMA 3R steel pulling boxes. The cutting teeth seem to grind away before they get a good bite in the steel. <br><br>Jolliness,<br><br clear="all">Mick Abraham, Proprietor<br>
<a href="http://www.abrahamsolar.com">www.abrahamsolar.com</a><br><br>Voice: 970-731-4675<br>
<br><br><div class="gmail_quote">On Fri, Oct 23, 2009 at 6:17 PM, Nick Soleil <span dir="ltr"><<a href="mailto:nicksoleilsolar@yahoo.com">nicksoleilsolar@yahoo.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div><div style="font-family: arial,helvetica,sans-serif; font-size: 12pt;">Hi wrenches:<br> I am looking for a new source for stainless steel, self-tapping, 32 thread per inch screws to bond Ilsco lugs to module frames. I used to buy these from Fastenal, but they don't supply them anymore. I have been using WEEB lugs, but one city jurisdiction doesn't allow them without the letter of authorization from BP Solar. I have contacted BP a couple times, requesting that they provide a letter to WEEB, and I heard, "it's complicated." I guess so. <br>
Maybe I will bolt the Ilsco lug through a threaded hole.<br> Nick Soleil<br>Project Manager<br>Advanced Alternative Energy Solutions, LLC<br>PO Box 657<br>Petaluma, CA 94953<br>Cell: 707-321-2937<br>Office: 707-789-9537<br>
Fax: 707-769-9037<div><br></div></div><br>
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