Spare wheel Clamp Bolt

[BBJ]

Hi

Does anyone know the thread size on the spare wheel clamp bolt? Got one from online suppliers and its too big. Did they do two different sizes?

Thanks

John

[bmcecosse]

Is it not 3/8" unf - same as wheel studs? Should have head to take the wheel brace.

[horologiumwatches]

Make sure the hole isnt full of paint before you condem it.........

[BBJ]

Looks like it may be a bit of spatter from a weld? I will re tap and all should be OK.

Thanks

John

[mike.perry]

There are different threads, what year car?

[BBJ]

Hi its 1969, just looked at the bolt again and it does look too big. Are there two different sizes of bolt dependent on year of manufacture?

Thanks

John

[mike.perry]

There were BSF and UNF threads, there was a change of bolts at car 451179. There may have been a subsequent change when the fuel tank was changed from 5 to 6.5 galls

[BBJ]

I assume mine will be a BSF thread? but what diameter, 5/16

thanks Mike

John

[mike.perry]

Should be UNF thread