I'm always asking about imperial threads

So for the ignorant, 1/4" BSF?

From the Part 1 link to the Australian pdfs I mentioned earlier;
Specifically about Stanley, but according to an earlier paragraph, also likely to be applicable to Record.

"Tapping blind holes: blind holes, such as those on the Stanley bench planes for the tote and knob studs, are quite often tapped in two operations. The first is typically at least a half to one thread deeper than the second so that the finishing tap need not remove a great amount of metal when it reaches ‘bottom’. If you look at the threaded hole in your Stanley you may be able to see this; if not you will be able to measure it because the fixing screw will seize before it reaches the bottom of the full depth of the hole."

Bill

My first thought, reading the comments re 1/4 BSW and M6 (MOST unlikely on a Record ) was 1/4 BSW

Are you not able to make one? (No die? )

The hexagon does not matter, except to absolute purists. It is only there to rotate the screw to provide the clamping force to hold things together.

At a pinch, could someone post pou a short piece of 1/4 BSF stud and a nut, so that the envelope is not too fat?

Howard.

.

Presumably a typo, Howard

Your later reference to BSF is correct

MichaelG.

Thanks for the quote, Bill

… That makes perfect sense as what the process should have been

What I was trying to imply was that maybe manufacturing shortcuts were being made; in the interests of economy, or just plain idleness. [e.g. The ‘shims’ for the nose of mine were pretty rough around the edges]

MichaelG.

Edited By Michael Gilligan on 16/10/2022 13:07:33

I have ordered a 3/8" by 1/4"BSF screw from the Bay, sent to my sister-in-law. Just have to wait now.

Some of the old makers made non standard proprietry threads specifically to force users to buy their spare parts. This is common with the large indexable insert producers, yuo buy a nice toolholder and find that only the same make of inserts will fit.

I've read somewhere that the Royal Navy used non standard threads so that if a warship fell into enemy hands they wouldn't be able to maintain it. Theses foreign chappies can't make nuts and bolts of course.

Thanks for sharing Bill, the 2 parts make interesting reading.

I understand the Brown Bess musket was made a larger calibre than the contemporary French service musket so we could use their ammunition, but they couldn't use ours.

Rob

I heard the the Royal Navy used no screws smaller than half inch diameter as the matelows would accidently twist the heads off anything smaller. It was probably a rumour put about by the army.