Ariel Owners Motorcycle Club

Does anyone know what the outer thread size is on the 57 Ariel SQ4 MII Centre stem and where can I buy a die nut.
Regards Nev Keeling

hi you will be able to get a nut and die look on Drags for the nut and what thread and size it is

For taps and dies etc, Tracy Tools are excellent.

nev keeling wrote: Mon Jun 09, 2025 9:00 pm Does anyone know what the outer thread size is on the 57 Ariel SQ4 MII Centre stem and where can I buy a die nut.
Regards Nev Keeling

It will be a Cycle thread. Are you able to measure the diameter?

As Mike said, Tracy Tools are excellent.

You don't need/want any excess play there either. Die Nuts are generally not adjustable. You might have to also make a new Cone and locknut. Nev

Hi

If by 'centre stem' you mean the pivot for the upper and lower steering yokes this will be a cycle thread, probably 26 threads per inch, (TPI). However getting a die in this large size may be difficult, Tracy only list a few, you may be lucky but if not you can probably restore the thread with a suitable thread file, Tracy supply these too.

Regards Mick

What is the diameter of the thread?

Die nuts are not adjustable and generally use for thread cleaning/restoration, not cutting new.

Uni Tools list a 1" x 26tpi at £101.70.....gulp.....

Depending on the diameter you might find bicycle tooling suitable. eg Cyclo Tools

https://www.bob-elliot.co.uk/viewdetail ... rget=46214

Die required is 1-1/8" x 28 tpi anybody out there got one?
Thanks nev

28tpi ?

I found 1 1/8" x 26tpi.
https://www.parktool.com/en-int/product ... e+%26+Fork

Tracy have one:

https://www.tracytools.com/product/1-1-8-x-26-tpi-bsc/