This is a 5/8" UNF thread.

These are used on the cranks as well as our wheel spindles

It has been zinc plated with a clear passivation.

We make these nuts as we were disappointed with the ones we were buying in so ended up making our own

They replace the following BSA part numbers.

21-2066

29-2023

29-6238 This is the thin nut.

Early crank nuts are often cycle thread.

There are two versions of cycle thread. The very early ones have a bigger outside diameter thread.

Rotor Nut PES Wheel Spindle Nut UNF N7 21-2039 21-2066 29-2023

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