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Sold
by simon8201 - 09/09/26 01:46 PM
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Wales
by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Oct 2020
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L - Learner Plates On
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OP
L - Learner Plates On
Joined: Oct 2020
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I ordered the Morgan third brake light stem and light. I went to install it and the stem has a weird thread on it. It is not SAE, Metric, BSF or Whitworth. Does anyone have one of these lights and if so what nut fits the stem. I am beginning to wonder if the poor machining of the stem bled over to poor cutting of the threads?? HELP!!
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Joined: May 2011
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
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2021 M3W
2013 M3W - Sold
1971 4/4 2 Seater
1934 Sports
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Joined: Oct 2020
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L - Learner Plates On
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well a 12mm 1.75 or 1/2" SAE nut fits it. It goes on so far and locks up. So I was told it is a whitworth 1/2" 12. nope. Then a BSF 1/2" 16, nope. I think it is just a faulty part. The BSF goes on and will get the entire nut started then locks up. This is a Morgan part. I will tried the 10 but it won't go on the stem. For what they charge for this, they should've sent the nut with the stem
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Joined: Mar 2014
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
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I've just checked mine and it is indeed a regular M12 1.75 thread and a nut can be easily threaded on - so I suspect that the thread on yours hasn't been cut properly.
Last edited by Bunny; 01/02/21 10:50 PM.
Andy
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Thank you for going through the trouble for me
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Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
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M12 is available with 1, 1.25, 1.5 and 1.75 mm pitch. Measuring the pitch over say ten thread peaks with vernier calipers then dividing will tell you the actual pitch on your stalk, if that helps. You can also confirm the thread major diameter which will likely be a tad less than 12mm for M12.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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I counted 16 threads per inch. What pitch does that make it ?
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Joined: May 2011
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
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16 TPI is a pitch of 0.0625 inches or 1.587 mm
2021 M3W
2013 M3W - Sold
1971 4/4 2 Seater
1934 Sports
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Scruffy Oik Member of the Inner Circle
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Scruffy Oik Member of the Inner Circle
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I counted 16 threads per inch. What pitch does that make it ? 16 threads in 25.4mm suggests a thread pitch of 25.4/16 = 1.58 so allowing for error in measurement a 1.5mm pitch
Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE
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Talk Morgan Expert
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Talk Morgan Expert
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A tip on the side, as questions about thread pitches are always asked here: A very usefull and inexpensive tool is a thread gauge. Here a photo Thread gauge![[Linked Image]](https://i.ebayimg.com/images/g/vDsAAOSwj8FfZG3C/s-l400.jpg)
Last edited by bmgermany; 02/02/21 06:48 PM.
2005 4/4 1800ccm Duratec and a lot of HONDA CX500.......
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