Joined: Aug 2019 Posts: 446 Threads: 69
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Location: Oxted
Car type: Austin 7s
Any thoughts on the size of the steering column thread?
I’m having trouble finding a suitable nut to fix the steering wheel.
3/4” x 20 tpi is too small.
I’ve just checked 4 columns and the threads are all between 0.775” and 0.781” x 20 tpi.
Could the thread really be 25/32”? Seems unlikely?
Joined: Nov 2017 Posts: 562 Threads: 56
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Location: West Yorkshire
Car type: Type 65 1934 + RP 1932
22-06-2022, 08:11 PM
(This post was last modified: 23-06-2022, 07:23 AM by Colin Wilks.)
Hi Henry
On my 1934 car the spanner for this nut is 5/8" BSW so suggests a Whitform thread, although the dimensions you give are a spit off M20 x 1.25mm. None of which is likely to help you at all I'm afraid, although Tracy Tools have some esoteric sizes in their taps listings. There seem to be a number of Admiralty threads on Austins, which are all bastard sizes. They are a hangover from Austin's wartime contracts. A mate with a lathe and some 28mm hex bar is probably what you need if noone has a nut they'll sell you.
Joined: Aug 2017 Posts: 686 Threads: 112
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Although I don't know for sure, Colin's reference to Admiralty thread size, echos my impressions when I first read your post. There are a number of Admiralty threads on the Seven, always seeming to be in the (somewhat) larger sizes.
Erich in Mukilteo
Joined: Aug 2017 Posts: 1,230 Threads: 33
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Location: Salop
Car type: '28 GE Cup. '28 AD Chummy '30 RL Saloon. '34 RP Saloon. Too Many toys!
I'm a great believer in that it is what you measure it to be.
Sounds like 25/32 20tpi to me
Joined: Aug 2017 Posts: 209 Threads: 1
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When I worked at the Seven Workshop we stocked these nuts.
I suspect that may well be still the case.
