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Old 25-07-17, 04:14 PM   #1
Kleftiwallah
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Default Threadform has me flummoxed!

The securing threaded shafts of a British Jaeger speedometer have me flummoxed. 34 T.P.I.(double checked) and the shaft is 3/16" diam', my 'very near' reads 0.190" or 4.84mm.

I've been through Mr F.J. Camm's Newnes Screw Thread Tables and I'm beat.

Anyone any ideas what this thread is? ? ?

Over to you knowledgeable people. Cheers, Tony.
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Old 25-07-17, 04:21 PM   #2
nickh
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2BA?

EDIT: Sorry, pitch wrong - it's 31.36 TPI but I 'saw' 33.36 or similar!

BTW, British Jaeger is just Smiths in party frock isn't it?

NHH

Last edited by nickh; 25-07-17 at 04:39 PM.
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Old 25-07-17, 04:43 PM   #3
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I'll have to defer to your more accurate equipment, I was using a bog standard Moore & Wright thread gauge which told me 34, so I went back and dug out all my other gauges and My M& W I.S.O gauge came up with 0.75 ISO. I've never come across this before. So what securing nut should I go hunting for?

Cheers, Tony.
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Old 25-07-17, 04:46 PM   #4
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M5 x .75 then I guess - perhaps BJ did keep some of the French Jaeger DNA after all.

My Father had a Delage with mostly Jaeger instruments.

NHH
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Old 25-07-17, 05:51 PM   #5
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Well...I've offered up an M5 X .8 and I think "It'll do a trip". Thanks for leading me by the hand nickh.

Cheers, Tony.
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Old 25-07-17, 06:45 PM   #6
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5x0.75mm seems to be part of an old French series described as being "gradually displaced by the International Metric thread" in the 1941 edition of Machinery's Screw Thread Book.

NHH
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