What is the typical size?
11/16 wrench size, while the thread is 3/8"-16 tpi on my 1920s demountable wheels.
Thank you for the information.
You can't get them in a hardware store that I'm aware of. Langs would be your best bet.
Even if I could get them at the local hardware store I wouldn't. Some of the fasteners sold there now are dangerously shoddy.
Original nuts are both larger across the flats and thinner through the threads than usual hardware offerings. This is why I always grind off peened over bolts when removing nuts so they can be saved.
Allan from down under.
The original nuts were 3/8 nc heavy hex semi finished jam nuts. That means that one side of the nut has a smooth surface, and is beveled at the edges. The other side of the nut has been cut off with a parting tool and left "as is" These nuts are not available from any commercial source that I have found. I make mine from standard heavy hex nuts. The nuts sold by the suppliers are a fully finished heavy hex jam nut that is chamfered on both sides and is thinner than the original nuts. It is my belief that the sharp edges of semi finished nuts help dig in to the surface of the hub and help keep the nuts from coming loose.