Campagnolo track axle nut
Unlike most others, Campagnolo track hubs have 26 tpi axle threading.
Before you go stripping your axles trying to use Dura Ace or other standard-threaded nuts and being all sad about it, do it right and get these.
• hardened cro-mo steel w/ rotating serrated flange washer
• chrome plated
• axle sizes: 26 tpi x 9mm (front), 26 tpi x10mm (rear)