<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Helicoils w/SS hardware. And not machine threads, which are guaranteed to pack solid with salt, rust and jam, or cross thread. Take your pick.</div><div>Vance<br><br>Sent from my iPhone</div><div><br>On Mar 23, 2015, at 7:59 AM, Alec Smyth via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">Ah, I have pondered something related for ages. I have an aluminum bow dome retaining ring bolted to an aluminum seat. I used aluminum screws, to reduce galvanic pair issues. And then I broke off one of the screws by pure clumsiness. I will have to drill this out, as there's virtually no stub, and will probably end up with one screw larger than the rest if I need to re-tap. But my question is... would you guys recommend using aluminum screws in this scenario? I am not really concerned about their holding power, there's a large quantity of screws involved.<div><br></div><div>Best,</div><div><br>Alec</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Mar 22, 2015 at 3:09 PM, Adam Lawrence via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
<div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial">Hi guys,</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial">There really isn't an appreciable difference
in performance between coarse and fine threads. The more important
questions are bolt/nut material, thread engagement and
torque.</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial">The argument for sticking with coarse threads would be that
you reduce the chance for cross threading the wrong bolt during assembly, since
coarse threads are predominately used.</font></span></div>
<div><font color="#0000ff" face="Arial"></font> </div>
<div><span></span><font face="Arial"><font color="#0000ff"><font>A<span>dam</span></font></font></font><br></div>
<div lang="en-us" dir="ltr" align="left">
<hr>
<font face="Tahoma"><b>From:</b> Personal_Submersibles
[mailto:<a href="mailto:personal_submersibles-bounces@psubs.org" target="_blank">personal_submersibles-bounces@psubs.org</a>] <b>On Behalf Of </b>Sean T
Stevenson via Personal_Submersibles<br><b>Sent:</b> Sunday, March 22, 2015 1:13
PM<span class=""><br><b>To:</b> Personal Submersibles General Discussion<br><b>Subject:</b> Re:
[PSUBS-MAILIST] coarse vs fine thread<br></span></font><br></div><div><div class="h5">
<div></div>
<p dir="ltr">Helicoils are an option.</p>
<p dir="ltr">Sean<br></p><br><br>
<div class="gmail_quote">On March 22, 2015 11:58:31 AM MDT, Rick Patton via
Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:
<blockquote class="gmail_quote" style="PADDING-LEFT:1ex;MARGIN:0pt 0pt 0pt 0.8ex;BORDER-LEFT:rgb(204,204,204) 1px solid">
<div dir="ltr">
<div>Hank</div>
<div><br></div>Fine is the only way to go as aluminum is a much softer metal
than steel so it will strip much easier so the more metal you grab, the
better, which fine threads will give you.
<div><br></div>
<div>Rick</div></div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Sun, Mar 22, 2015 at 5:55 AM, hank pronk via
Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT:1ex;MARGIN:0px 0px 0px 0.8ex;BORDER-LEFT:#ccc 1px solid">Help
I need advice!<br>My new bow dome will be secured to the Al mating ring with
straps. I am laying out the bolt holes to be threaded in the AL
ring. My question is, should the bolts be fine or coarse thread? What
holds better in AL ? The threads will be 3/8 by 1 in deep.<br>Thank
you in
advance.<br>Hank<br>_______________________________________________<br>Personal_Submersibles
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