Spanner and thread sizes

[hdavy]

biggingers list is great but can one assume that all the threads on a minor 1000 are BSF. ( Leaving out the funny metrics on MM's!) If not can someone list the variants?

[IslipMinor]

As a general rule the Minor body uses BSF threads and the mechanicals UNF/UNC. If you have a set of BSW spanners, the head size on BSW is one size larger than BSF, so to use them for BSF use 1 size smaller! For example for a 5/16" BSF nut/bolt use the 1/4" BSW spanner.

[hdavy]

Have plenty of spanners but I would like to know the threads so that can get spare nuts and bolts. Which are UNF and which UNC? For example what are the screws holding the door pulls on and which are those fixing the glove box surround?

[les]

I think the items you mention use self tapping screws, not engineering screws ie unf or unc

[bmcecosse]

UNF in steel - UNC used in cast iron (eg cylinder head studs in the block) and in Al alloy (eg gearbox). The 'body' of the car is generally BSF .

[mike.perry]

You cannot rely on nuts and bolts being a specific thread, the cars are between 40 and 63 years old, many with a chequered history so over the years any old nut and bolt could have been fitted without the owner appreciating the difference

[ASL642]

And whichever they did use in the past will most likely have their threads chewed up by someone using the wrong screwdriver!

[MarkyB]

The bolts you can buy are likely to be threaded all the way to the head.
Just because they are new and shiny it won't make them better than bolts that have a smooth shank for the correct length for the job in hand.
Nuts and bolts that haven't been mangled by DPOs (Dozy Previous Owners) or severely corroded can be prettied up with a rotary wire brush then treated and painted if that's your thing.

[bmcecosse]

If they are threaded all the way up to the head - they are not 'bolts' - they are set screws! And they should not be used where 'bolts' are specified - since the unthreaded shank of the bolt is likely to be providing a fixed location/fit between parts - which the threaded shank will not do.