[PSUBS-MAILIST] coarse vs fine thread

[Adam Lawrence via Personal_Submersibles]

Hi guys,
 
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.
 
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.
 
Adam

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From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
On Behalf Of Sean T Stevenson via Personal_Submersibles
Sent: Sunday, March 22, 2015 1:13 PM
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] coarse vs fine thread



Helicoils are an option.

Sean




On March 22, 2015 11:58:31 AM MDT, Rick Patton via Personal_Submersibles
<personal_submersibles at psubs.org> wrote: 

Hank

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. 

Rick

On Sun, Mar 22, 2015 at 5:55 AM, hank pronk via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:


Help I need advice!
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.
Thank you in advance.
Hank
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