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Thread: English or metric. How to tell?

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  1. #21
    Advisory Panel Patrick Chadwick's Avatar
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    "I have also accumulated a large stock of BA, UNF, metric, Whit, BSF and cycle fasteners over the years."

    With 400 sq ft available! Try harder.

    "I don't say the above to brag..." Neither do I

    But to the above list I can add such quaint items as Panzergewinde (Germanicon conduit thread), Britishicon conduit, BSP, NPT, ACME, ME, UNC, UNEF, metric series 1mm, 0.75mm, 0,5mm and some oddballs (like multi-start taps) that really puzzle me.

    I learnt a long time ago to keep all machined thread items (nuts, bolts, spindles...) from every piece of dismantled equipment that I could get my hands on.

    Motto: it might come in handy one day. 99% will probably never be used, but the usable 1% is priceless.

    - Of course, the trick is to find it when you need it!

    But if you want to refurbish old rifles (back to 1670 to date) then you need to be a bit flexible about things like thread forms.

    Today's useless information: did you know that the barrel thread for a Luger pistol is 18mm diameter x 20 tpi? Eat that, standards fanatics!

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    Legacy Member Bruce_in_Oz's Avatar
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    I suspect that the reason for the presence of "Imperial" threads, especially thread pitches, in Mausers, Arisakas, Mosin Nagants, (and Lugers) was that almost all of the machinery used to make such things was initially from Britishicon manufacturers.. See also the rapid rise of US tooling and machinery from folks like Whitney and companies like "Bridgeport" and "Cincinnati".

    The entire Japaneseicon ship-building industry used the very British "Admiralty" thread system until VERY recently, and the probably still have the capacity to turn out the appropriate fittings to keep someone's rust-bucket afloat for a few more years.

    The Imperial Japanese Navy was totally modeled on the Royal Navy, right down to the nuts and bolts and "mess traditions", with about the only significant difference being the issue of Sake instead of rum.

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    Contributing Member Flying10uk's Avatar
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    Quote Originally Posted by Patrick Chadwick View Post
    then you need to be a bit flexible about things like thread forms.
    Yes, this is what I am implying and it's the same with any hard to find thread for obsolete machinery.

    I would suggest that with a small size screw such as 3/16" B.S.F. and using a 2 B.A. nut, if the correct one isn't available, as a "work-round-solution" because even though the thread angle is different, the actual missing metal from the mating threads is tiny. This is because the difference between the 2 thread angles is only a few degrees over the height of the thread. One could work it out if one wished but the result would be a tiny amount of metal missing from the mating threads.
    Last edited by Flying10uk; 03-27-2021 at 07:39 PM.

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    Contributing Member David TS's Avatar
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    Quote Originally Posted by Patrick Chadwick View Post
    "I have also accumulated a large stock of BA, UNF, metric, Whit, BSF and cycle fasteners over the years."

    With 400 sq ft available! Try harder.

    "I don't say the above to brag..." Neither do I

    But to the above list I can add such quaint items as Panzergewinde (Germanicon conduit thread), Britishicon conduit, BSP, NPT, ACME, ME, UNC, UNEF, metric series 1mm, 0.75mm, 0,5mm and some oddballs (like multi-start taps) that really puzzle me.
    Ok Patrick, I will happily defer to you on this one

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