Whitney Kennedy screw dimensions

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sicesp
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Whitney Kennedy screw dimensions

Post by sicesp »

I am trying to re create the loading gate screw on a WK 44-40, but it is giving me some fits. Can anyone check the thread count? I figured it's an oversized 6-40 but having trouble there.
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GunnyMack
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Re: Whitney Kennedy screw dimensions

Post by GunnyMack »

Over sized 6-40 as in an 8-40? It could very well be a bastard size screw. You might have to make it...
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Re: Whitney Kennedy screw dimensions

Post by harry »

You probably need to find the class of thread, biggest mistake made by gun smiths and others.
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https://www.newmantools.com/taps/taptech.htm
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sicesp
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Re: Whitney Kennedy screw dimensions

Post by sicesp »

After exhaustive searching and measuring, I discovered that the thread is 4 BA, which is an obsolete British thread. It is 38.46 tpi. Yep, strange and interesting.
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Re: Whitney Kennedy screw dimensions

Post by M. M. Wright »

Sounds like you'll have to single point it. Is that close to anything metric when you convert it? Remember that metric threads are designated by the distance from one peak to the next so pitch is .66mm. Just trying to find a pitch that you can find a change gear for.

Don't forget about Whitworth threads, the system used by the UK at that time. Dig out your Machinery's Handbook.
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GunnyMack
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Re: Whitney Kennedy screw dimensions

Post by GunnyMack »

Reach out to Nath and or Gamekeeper here, maybe they can find the screw you are looking for since they both live in the UK.
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Re: Whitney Kennedy screw dimensions

Post by Sixgun »

I think you are all over analyzing the whole thing.....unless the rifle is a pristine or near pristine example, just get an SAE screw of comparable size and thickness, shape the head like the original, antique the finish, then retap the receiver to the SAE size.-----6
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GunnyMack
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Re: Whitney Kennedy screw dimensions

Post by GunnyMack »

I had the same thought Six , I didnt want to be they guy to suggest it tho :D
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Re: Whitney Kennedy screw dimensions

Post by Sixgun »

Gunny.......it's what I thought from the git go.......I was waiting for someone to suggest it also. :D been there....done that several times....Winchester stock bolts are 12-28 and I've bought rifles over the years where the threads were stripped out....dang if I'm gonna sleeve em on a 10 cent beater....1/4"-28 came to the rescue. ----6
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sicesp
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Re: Whitney Kennedy screw dimensions

Post by sicesp »

The BA thread is a metric based system devised when the prediction was SAE would be extinct within 100 years. The threads are 47.5 degrees included angle. Though obsolete for the MOST part, there are a smattering of niche uses and I found a British firm that carries that tap.

Six-gun and gunny: I appreciate your input. Yes, if my back were against the wall, I would tap the receiver. But, if I can do it the "hard" way, keeping the original thread, I will... not for reasons of value, because I doubt the thread on the loading gate screw matters that much... just out of an eccentric sense of the need to keep it as it was manufactured. Not to mention that I am doing this for someone FAR away, whose rifle I haven't, and I would rather make his screw than tell him to tap the receiver.
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Re: Whitney Kennedy screw dimensions

Post by sicesp »

Another interesting tidbit:. Whitworth was used for larger screws, but this system was made for screws of 6mm diameter down to the tiniest watch screw.
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