On trying to do a simple job for a friend, I need to drill a hub back plate to take the small countersunk screw that holds the brake disks on to the hub.
Only thing is I am not sure of the thread size. I believe it could be 1/4 UNF, when I try a bsf screw it will only go so far in to an existing threaded hole.
Can anyone confirm what is used. The car is an old MGB. Or even what is used on modern cars.
Adrian
how old is the mg are we talking 60s ect
Andrew Bishop
MGC vintage, I would guess 60's but have to admit not up to knowing.
I would guess that modern car fittings are 6mm.
Adrian
MG B's had Unified threads & the brake disc screws were indeed 1/4 unf 28 tpi.
Thanks very much for confirming my fears, I will have to buy a tap to match.
Cheers
Adrian
Without going and checking, I think the modern ones are a coarser thread than normal M6.
OK thanks for that, I was just wondering what the later cars had as an alternative.
Adrian
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