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Screw thread puzzle
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Roger-hatchy



Joined: 07 Dec 2007
Posts: 2135
Location: Tiptree, Essex

PostPosted: Thu Aug 14, 2014 8:14 am    Post subject: Screw thread puzzle Reply with quote

I seem to remember a thread on the forum about screw thread forms, tpi's etc. but can't find it.

This has been posted on another forum and I'm sure it can be answered by someone on here


Quote:
I have posted before that the awkward nuts holding the top stud of headlamp bezel can be replaced by SS wing nuts, to ease bulb replacement.
The puzzle is that metric M5 fits. An M5 die runs down the thread perfectly, although the wing nut wobbles slightly. I can't find any Imperial or US thread forms to match M5. M5 has a pitch of 0.8mm or 20.3 tpi.
So thinking caps on, please! Or am I missing the obvious- that a metric thread was used?
:end Quote

I think this is on a 1956 100e Anglia

Thanks
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Miken



Joined: 24 Dec 2012
Posts: 544

PostPosted: Thu Aug 14, 2014 9:45 am    Post subject: Reply with quote

It may be 2BA
Major dia 4.7 x .81 pitch.

A M5 nut will fit but be wobbly as you describe.
Mike
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47Jag



Joined: 26 Jun 2008
Posts: 1480
Location: Bothwell, Scotland

PostPosted: Thu Aug 14, 2014 3:36 pm    Post subject: Reply with quote

Roger,

If it;s on a Ford the betting is that it will be 10/32 UNF which is essentially the same as 2BA with maybe a difference in the heads.

Art
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Roger-hatchy



Joined: 07 Dec 2007
Posts: 2135
Location: Tiptree, Essex

PostPosted: Thu Aug 14, 2014 4:50 pm    Post subject: Reply with quote

Thanks fo that
Will pass on the details.

Plus a link to this post Wink
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JohnDale



Joined: 19 Mar 2008
Posts: 790
Location: Kelvin Valley,Scotland

PostPosted: Tue Aug 26, 2014 9:57 am    Post subject: Reply with quote

47 Jag is right on the money,cheers,JD.
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1958 Ford Zephyr Mk2 Convertible
1976 Ford Granada Ghia.
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