Fuel tank centre bolt ? (swinging arm frame) .

[Stephen Foster]

Hello ,
Wonder if Anyone might be able to inform Me the diameter and length of the centre fixing bolt for My 1955/56 swinging arm frame A10 please ?
Should this bolt also have a reduced head ?

I am struggling forcing the rubber bung deep enough to get the thread to start and am hoping to be able to find a slightly longer bolt ?

Thank You in advance ,
Steve..

[muskrat]

G'day Step.
The dimensions aren't in the nut & bolt list 
Found this at DeGroots https://degroot-bsa.nl/product/central-bolt-a-b-model-en/
3/8" BSC, 53 mm long.
Cheers

[RogerSB]

Here are the measurements in a list I have for pt. no. 42-8011, Petrol tank securing bolt.

3/8” x 2  1/16” x 26 tpi.

Rog.

[Stephen Foster]

Thank You ,
Im trying to source a bolt slightly longer to adjust to fit .
I now know the thread and diameter .

[muskrat]

G'day Step.
Nooky's Nuts have 3/8 X 1.1/4 or 1.1/2 BSCY bolts for ￡2.00 per bag of 3
http://www.nookysnuts.com/catalogue/fasteners/brightzincplated/nutsandbolts.html
Cheers

[Stephen Foster]

LOL ! Thank You Jim ...I have just ordered from Him !

[Roger (Doomtrainbarx)]

I turned my bolt into a stud/nut - much easier and quicker to remove and replace the tank.

[Stephen Foster]

I had thought about that Roger !

[muskrat]

G'day Fellas.
I use a stud as well on the Cafe. I had to move the socket to fit the long f/glass tank.
Cheers