Ariel Owners Motorcycle Club

Hi, This my seem like a daft question but what size threads are used on my Nh350? (U.N.F. or U.N.C. etc).
I'm in the process of blasting and painting and will need to clean out the threads.
Cheers Norm

The vast majority will be BS Cycle; a few will be BSW, particularly where you are threading into alloy.

Ariel didn't start using Unified threads until the Leader arrived - there are no Unified threads on the four strokes, and no BSF either.

Thanks Simon.
I'm going have to build up a selection.....got loads of metric.... not much help though!

If you get yourself 1/4 x26tpi, 5/16 x 26tpi and 3/8 x 26tpi cycle threads, plus 1/4 x 20tpi whitworth you will be able to deal with 95% of the threads on the bike. I buy HSS ones from Tracy Tools in Devon and it is very unusual not to receive them the day after they are ordered.

Tracy Tools are excellent to deal with and good on prices too. You could save a few quid by buying the ordinary carbon steel taps and dies if you are only going to be cleaning threads up. They'll cope well with cutting just a few new threads, especially if you are able to cut them first on a lathe, but HSS are well worth the extra if you have a lot of restoration work for them to do.

Steve

Thanks to Steve and Paul, Very helpfull.
I'll get on the "case"
Cheers Norm

That's another thumbs up for Tracy Tools!

Don't mix up 1/4 cycle with 1/4 BSF.

Both are 26tpi, but a different angle.

Tracey Tools are good, also try www.uni-thread.com. I have had good service from them as well.

Sorry to be a pedant, well not really, I quite enjoy it but there are the odd BSF threads on Ariels:- 1953-58 side stand pivot bolt, studs for full width rear sprocket, some SQ4 head bolts; don't ask why 'cos I don't know.

Thanks for the correction Roger - interested to know which QD hub studs? I've got two QD hubs, but I've not had to clean the treads on either of them - good thing I haven't, I would have assumed they were BSC.