3/8 - 24 tpi 12 Point Nut Stainless. Triumph, BSA part number 21-0692
21-0692 - S42
This is a single chamfer nut made from 303 stainless steel. It is machined back and front for a superior finish. The 12 flutes are machined in and not stamped like some.
There are 2 nuts shown for clarity, the price is for one nut
You can buff it to a chrome finish or sand blast it for a cadmium look.
These nuts are in a class of their own and not like the ones stamped out you see elsewhere.