Steven,
The wrench size is 9/16" W (Whitworth) which is also a listed as a 5/8" BSF
(British Standard Fine). A far as the threads go, they should be a
Whitworth Thread Form, possibly either BSF (British Standard Fine) or BSP
(British Standard Pipe).
At the moment I cannot access the treads to get a thread gauge on them to
measure the tpi.
However you're not going to find this size nut at any hardware store, it's
a special fastener and you'll have to find a used one, or have one cu$tom
machined, unless of course one of the AH suppliers has them.
Cheers,
Curt
On Mon, Jan 6, 2014 at 3:39 AM, STEPHEN CUSS
<stephen.j.cuss@btinternet.com>wrote:
> Hi I asked this question a few weeks ago but only got a partial answer, can
> anyone help me with the size of the plug and the thread type, as i am
> trying
> to order a magnatic drain plug for my BN1 and need to know the thread type
> and
> size, the car is original with original sump.
>
> Thanks in advance for your
> help with this matter
>
> Steve
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