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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Jim Duncan<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Allan Sindelar<br><b>Sent:</b> Thursday, March 15, 2012 10:17 PM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] No underside access metal biulding attachment<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>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? <br><br>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. <br><br>Allan<o:p></o:p></p><div><p class=MsoNormal><b>Allan Sindelar</b><br><span style='font-size:10.0pt'><a href="mailto:Allan@positiveenergysolar.com"><span style='color:#000099'>Allan@positiveenergysolar.com</span></a></span><br><span style='font-size:10.0pt'>NABCEP Certified Photovoltaic Installer<br>NABCEP Certified Technical Sales Professional<br>New Mexico EE98J Journeyman Electrician<br><b>Positive Energy, Inc.</b><br>3201 Calle Marie<br>Santa Fe, New Mexico 87507<br><b>505 424-1112</b><br><a href="http://www.positiveenergysolar.com/" target="_blank">www.positiveenergysolar.com</a></span> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-right:722.25pt;mso-margin-bottom-alt:auto'><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><br>On 3/15/2012 8:53 PM, jay peltz wrote: <o:p></o:p></p><p class=MsoNormal>Hi Allan, <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I get 1/4 x 20 self taping screws from.<o:p></o:p></p></div><div><p class=MsoNormal>I think they are even stronger than the TEK screws.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><a href="http://dynamicfasterner.com">dynamicfasterner.com</a><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Jay<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Peltz power<o:p></o:p></p></div></div></body></html>