1/2" BSB is the thread often used on table lamps to hold the bayonet fitting into the lamp body. If you get one with a china/glass base you might find a nut or two. Try a jumble /car bbot sale.
If you want to borrow a tap and make some nuts then I think I have one somewhere. Let me know and I'll instigate a search in the furthest reaches of the workshop bobdotminchinatntlworlddotcom
Hi Dave, It's Standard brass. 26 tpi, depth of thread .0246, core diameter.4508, tapping size 29/64. If you are restoring an antique car, why are you using foreign measurments? ATB Chris.
It is actually my father that restores vintage cars. Some of his cars can be seen here...
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(Mr Stevenson, you saw one when I came to see you last year, though the item is not for one of those)
Anyhow, I am younger than 40, so my measurements are in metric (though I can do English). It was just the micrometer I had to hand when I measured the threads, so I roughly translated it to english.
Mr Stevenson, as you are not too far from me (or my dad), (Kirkby-in-Ashfield), I have given him your details, so you may be getting a call from him pretty soon. He basically has a temperature guage and needs a nut for it.
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