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Threading A Clamping Nut Question

Threading A Clamping Nut Question

Threading A Clamping Nut Question

(OP)
I have a clamping nut that is a part of a coaxial connector and need to know if I can thread the portion shown in the attached drawing (I didn't inlude the whole clamping nut just the area I want to apply the exterior thread too).

Basically my question is how do I determine if I have enough contact area on the outer diameter (where the wrench flats are) to create a strong mating?

Any help would be greatly appreciated.
Nicole

RE: Threading A Clamping Nut Question

You want to put an external thread on this?

RE: Threading A Clamping Nut Question

(OP)
Thats the idea . . . assuming its possitble . . .

RE: Threading A Clamping Nut Question

(OP)
I would (best case scenario) like to put a 1.438-18 UNEF external thread on it.

RE: Threading A Clamping Nut Question

start by looking at your major/minor thread diameters and see where they will end up on the part. Your drawing is missing some dimensions that would be needed to provide a better answer.  

RE: Threading A Clamping Nut Question

It looks like the distance across flats is about 1.420".  The minor diameter of a 1-7/16 UNEF thread is 1.3693" from Machinery's H'book.  Not sure what your objective is but you either have incomplete thread engagement or crushed threads if you try to use the wrench flats for their intended purpose.

Bruce
www.accuratus.com

RE: Threading A Clamping Nut Question

(OP)
Thanks Ceramicguy, I will not be using the wrench flats once the thread is machined onto the piece.

RE: Threading A Clamping Nut Question

I think I understand your question.  Standard equations allow you to calculate required thread engagement, but you have an interrupted thread.  I would use the standard equations and reduce the thread area by the proportion of threaded/unthreaded area you have.

RE: Threading A Clamping Nut Question

it is hard to tell without more dimensions but to me it "looks" like you will get full thread profile on the wrench portion and partial thread profile (the thread peaks) all the way around your part. I would highly doubt this will be equivalent in strength to a full thread but should be pretty darn close. Looks doable to me.

RE: Threading A Clamping Nut Question

(OP)
Thanks for everyones input, it was all very helpful.

RE: Threading A Clamping Nut Question

And you are designing equipment for aeroplanes that fly with passengers?

RE: Threading A Clamping Nut Question

(OP)
I do (electrical mostly), but this paticular piece is for a different (much less critical) application.

As an FYI I took the part to a machine shop and was able to determine that there was not enough area to provide sufficient thread contact.

Everyones comments were appreciated.

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