[PSUBS-MAILIST] coarse vs fine thread

[Rick Patton via Personal_Submersibles]

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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