Does anyone know the thread type on the countersunk floor board screws used on the DB18 please?

On the DB 18 Tickford DHC they were a Whitworth thread

Hi John
On the Special Sports the countersunk screws that fix the floorboards to the captive nuts on the body members are 1/4 BSF.
Terry

Quite right - 1/4 BSF, which I learned from bitter experience because here in Oz countersunk headed screws with this thread are made of a very special material called unobtainium. In the end I had to lever open the edge of the captive nut retainer, remove the captive nut and replace it with a UNC threaded nut and use a UNC-threaded brass countersunk screw.
Steve.

Thanks for replies as I have some missing,

Actually Steve, Keables in Melbourne have them but only with an allen screw head and very expensive.
I got some from them to do the LD10.
Cheers
Keith

Just info in case others need they are plentiful in the UK and cheap.

http://www.ebay.co.uk/itm/50-x-1-4-BSF- ... SwKytZNcFR