Can not figure out the thread size on a H.F. Spray gun connector?
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  1. #1
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    Default Can not figure out the thread size on a H.F. Spray gun connector?

    Hello Forum,

    I have a perfectly fine Harbor Freight 4001 paint spray gun. I want to make an adapter for the connection between the paint cup/pot and the gun. The male threads on the gun that screw into the pot's swivel nut are not standard as far as I can see? They measure 16.5mm and have roughly a pitch of 1.25. They are straight threads, not tapered. Alternate measurements are .648" and 20 TPI. But I have not found these specification anywhere for threads?

    Anyone know what the deal is on these threads. Only constructive answers please. Thanks, Cismontguy

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    Bspp? ............

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    I kind of doubt that its British Standard Parallel Pipe thread? Cismontguy

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    Quote Originally Posted by Cismontguy View Post
    I kind of doubt that its British Standard Parallel Pipe thread? Cismontguy
    Did you check?

    BSPP is very common outside of the US and used a lot on fittings of that type.

    Ed.

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    Sounds close to 3/8" BSPP, indeed.

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    I ran into this very issue when adapting to a disposable cup system, it is a BSPP..at least that seemed to work on mine.

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    Quote Originally Posted by daryl bane View Post
    I ran into this very issue when adapting to a disposable cup system, it is a BSPP..at least that seemed to work on mine.
    perfectly fine and harbor freight, now there's an oxymoron if there ever was one!

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    You will find that BSP threads are very common in China. It is their standard go to fitting thread form.

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    Quote Originally Posted by moonlight machine View Post
    perfectly fine and harbor freight, now there's an oxymoron if there ever was one!
    I watched a video of some guy plugging up all the leaking threads of his HF gun with teflon tape.

    Take a good look at the gun and then find out which model of Devilbiss the ChiComms copied. Then just ask Devilbiss customer support.

    I payed more for shipping on my last gun compared with this:

    20 oz. HVLP Gravity Feed Air Spray Gun


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