Number of threads pass the nut
Number of threads pass the nut
(OP)
Does anyone know a code or a mechanical requirement/justification to have two or more threads pass the nut when torquing hex nuts. I have been told that at lease two threads must show pass the nut and I am not sure why. Please respond. Thanks





RE: Number of threads pass the nut
RE: Number of threads pass the nut
RE: Number of threads pass the nut
This ensures that the full number of threads act in shear when the bolt is in tension, and also ensures that the pattern of stress in the threads at the tip of the bolt is the conventional pattern on which codes and design parameters are based.
RE: Number of threads pass the nut
RE: Number of threads pass the nut
RE: Number of threads pass the nut
RE: Number of threads pass the nut
guys to ensure because of stack up of tolerances
that the flush or extended case would exist.
You cannot design flush conditions unless every
thing is perfect and we are not there yet.
RE: Number of threads pass the nut
RE: Number of threads pass the nut
As to the one thread, two thread question--- in the heavy construction industry we have come from two thread (the accepted 'norm' of 30 years ago) projection to 'flush nut', the common practice in the L.A. area for the last few years. With the now common practice of using TS bolts, the problem of overtorque has largely been solved (along with the noise problem). In my practice with auto and aircraft restoration/racing, where safety wireing is not required, Nylocks work quite well at 'flush nut'.
Rod