Nylon 6/12 Rod

Nylon 6/12 exists for one reason: it absorbs about a third the water of nylon 6/6. Measured on the same method by the same manufacturer, 24-hour absorption is 0.15% against 0.45% and saturation is 3.0% against 8.5%. Since moisture pickup and the dimensional growth that follows it are the usual reason a nylon part drifts out of tolerance, 6/12 is what you specify when the part has to hold its size in wet or humid service. Tensile strength is 10,000 psi at yield on a 300,000 psi modulus, flexural strength 14,000 psi on a 350,000 psi flexural modulus, compressive strength 11,500 psi at 10% strain and hardness Rockwell M70 (R114).

It is machined into close-tolerance bushings, rollers, guides, electrical parts and conveyor and power-engineering components. Melting point is 422F and continuous service 185F, with a 690 V/mil dielectric strength for insulating work. Be clear that the moisture stability is paid for everywhere else: heat deflection at 264 psi is only 142F against roughly 200F for 6/6, hardness and modulus are the lowest of the unfilled nylons, and at a 0.31 coefficient of friction with a 190 x 10^-10 wear factor it is the poorest bearing material in the range. Buy it for dimensional stability, not for load or wear. Natural is the only colour.