[PSUBS-MAILIST] coarse vs fine thread

[Sean T Stevenson via Personal_Submersibles]

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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>
>
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