Ah! You actually have a screw? You need another? Have you measured the pitch? I was under the impression you only had the internal thread.@Milkybars, great minds and all that. It's a bit blurred but the best I can do on macro setting. It's 3mm diameter and 1/4 inch long (thread length) Hope that helps
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Also very fine profile like a self tapper.Looking at the extremely blurry photograph, if it had a point on it, we would call it a self-tapping screw.
If it did belong to that category of fastener, as opposed to the standard machine screw that we are all assuming it is, it would explain the coarse thread on such a small diameter.
BA threads were introduced in early 1900’s, it may be Thury or even LowenherzIt'd be worth finding out when BA threads were introduced, and relating that to the age of the item....?
Yep, and the joy of that, is that it's now made in France!Metric, I seem to recall.
Edit: 5/32" BSW, it would seem.
Mange Tout!Yep, and the joy of that, is that it's now made in France!
If you couldn’t find a matching thread then it was probably made using a thread plate , back in the day everyone made there own threads after making thread plates using their own thread design.UPDATE. One of my customers makes threads in things, That's all he does. Tiny threads up to ones on great big turbines. He came to the shop with all his measuring gear. the bolt was a 0.8 pitch and 3mm diameter. He couldn't get a match for the TPI from any of his books, measuring devices and experience! If he doesn't know. Then I don't think anyone does. We have put the thing together now, used a 2.5mm countersink that I had from somewhere. Cut it to length and stuck it in with superglue. A bodge yes, but I've got a queue from the repair café backing up in the workshop.
That looks a nice bit of kitIf you couldn’t find a matching thread then it was probably made using a thread plate , back in the day everyone made there own threads after making thread plates using their own thread design.
Dell
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the bolt was a 0.8 pitch and 3mm diameter.
I have a few of them because I restore antique clocks and a lot of early clocks were put together using screws made with thread plates.That looks a nice bit of kit