Thread size ??

Started by andy, March 16, 2017, 12:08:05 PM

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singleminded

Andy. i'm flying out to Australia on holiday today.I'll post it when I get back..John

andy

apologies John, only just seen this pm sent, I do have one but a spare would be great thank you

singleminded

I made some nuts for a chap recently, if you need one let me have you address as a pm and I'll send one..john

Greybeard

#4
It's a Whitform type thread, Andy. Same as used on the axle tubes of my '37 Lion.
http://www.tracytools.com/taps-and-dies/whitform-taps-dies?product_id=1130

Steve
1916 Triumph Model H
1926 AJS G8 500cc ohv
1937 Sunbeam Lion 500cc
1937 Ariel 500cc
1949 Matchless G80S
1952 BSA A10 Golden Flash
1953 Matchless G9
1953 BSA B31
1961 Matchless G80
1961 AJS M31 De Luxe 650cc
1961 Panther M120 650cc
BMWs R100RT - R80 - 1960 Earles fork R60
1960 Rover P4

andy

well, I re visited the situation, it is indeed 24 tpi and 3/4 " I looked also and couldn't match it up with anything, anyway I have a rear drum and sprocket in my bits pile for a 1920's 3.5hp, it has the bearing in place and the securing nut is of the correct size so all good, it is an odd size though

iansoady

My Machinery reference book doesn't list that combination as either BSF, CEI or UNF.

Probably a special, as many others are, for example the exhaust nuts on my Model 10 are something like 1.25 x 20 tpi.

It wouldn't be impossible to get a nut made (if that's what you need).

andy

#1
Can someone tell me the thread size on the gearbox main shaft that the clutch bolts onto? the bike is a 4 speed 1932 model 9, it does have the pull clutch but I think the thread is the same size as the 3 speeds ??

The shaft is 3/4" and is 24tpi