Petrol Tank

[falconho]

Hi does anyone know the thread size of the tank knee pad brackets screws and the smaller single screw in the pear shaped badge 1967 Thunderbolt UK tank , and where would I get the  taps to clean the threads Thank you

[cdsdorset]

3ba by 7/8. Only bsa would decide on that size!

[V500]

Probably got a job lot of 3BA screws from Lucas.

[falconho]

Is that 3BA for the knee pad bracket the pear shaped badge screw is smaller do you know what size this is

[cdsdorset]

56- 68 is 3ba.

[Ian C]

Is that 3BA for the knee pad bracket the pear shaped badge screw is smaller do you know what size this is

AFAIK, the kneegrip bracket screws which are BSA part no. 24-7178 are 1/4" x 26TPI (some sellers claim CEI and some BSF)
HTH

[cdsdorset]

Sorry. Wasnt clear 3ba is for the badges.

[limeyrob]

Confusingly in 1/4 CEI / BSC and BSF are all 26 TPI.

[V500]

And in these days of "near enough is good enough" repro stuff, some suppliers will supply either for any given task, but back when these threads were in common use they weren't considered to be interchangeable.