It is possible that the threads are BSP (British Standard Pipe) for
non-pressure-tight joints. A 3/8" BSP thread is a scootch over 5/8" OD
(0.656" to be precise) and has a Whitworth thread form, with 19 threads per
inch.
Mike
----- Original Message -----
From: "Alexander Delis" <ols@bcdef.net>
To: "List Triumph" <triumphs@autox.team.net>
Sent: Wednesday, December 30, 2009 3:06 PM
Subject: [TR] driving light question
> Hello all
>
> I have a couple of pairs of driving lights (Lucas 576, and 700) I
> purchased on
> Ebay several years ago.
>
> I know have a little bit of time, and want to put them on a couple of my
> cars.
>
> The questions:
>
> 1. All of the lights have a threaded tube coming out of the bottom to
> attach
> them. I want to put one of each on a badge bar on my TR3, and am looking
> for
> suggestions on where to put them on my GT6 without having to butcher the
> car
> doing so. How do I do this?
>
> 2. The threaded rod coming out of the bottom seems to be 5/8 inches, but
> not a
> standard thread. Does anyone know what size nut fits it?
>
> 3. What is the correct bulb for these lights, and where can they be
> obtained?
>
> Thank you all very much for any help you can give me.
>
> Alex
>
>
> 1958 TR3 TS33884LO
> 1968 GT6 KC10303
> 1976 TR6 CF51981U
>
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