Hey,
4-40 / 5-40 refer to the size of the thread.
The front axles on the b4, the ones that need a nut to keep the wheel on are a 5-40 thread. The 6222 nuts are nylon and the axle will cut a thread into them.
Part number 6629 are Associated 5-40 lock nuts.The 6222 nuts are good enough for the front wheels and are what most people use. Just change them every so often.
MiCk B. :-)
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