ns thread callout help
 

ns thread callout help
i would like to know how to properly call out a ns external thread (shaft) for a bearing locknut. the locknuts are common (n-05 at most suppliers) and the thread o.d. is .969 with 32 tpi. i have found different manufacturers with slightly different tolerances but most seem to be class b. some call this same thread 25mmx32 having the same o.d.
this is a replacement shaft for a north american machine.
i am used to calling out standard fractional threads, but in this case do i use decimals? and tolerance?
can someone point me to a definative chart pls.
ps ive look in my machinerys handbook and can't find an ns spec chart
thanx
first off look here......