Slide-screw (JSCR) test using resin nuts (nuts made of resin materials) was conducted to research the load capacity of resin nuts. A nut made of PI2 (the resin material containing PI: Poliimid and PTFE : Polytetrafluoroethylene) withstood more cycles of SCR test under the axial load of 600 N than nuts made of any other materials tested, and thus we concluded that PI2 was the best material for resin nuts with high load capacity. Furthermore, pin-on-disk (POD) test was conducted to know the relation between the friction coefficient and specific wear rate in SCR test and those in POD test for the same resin material. The results showed that the friction coefficients were almost the same (〜0.08) in both of the tests, while the specific wear rate in SCR test tended to become larger than that in POD test. The increased specific wear rate in SCR test was ascribed to the longer contact length (the length of contact area along sliding direction), which was 550 mm between the screw and resin nuts and 3 mm between the disk and resin pins, hi practice, the specific wear rates was decreased in the SCR test using the resin nuts with 18 mm contact length, which was shortened by cutting the screw thread away over 1.5 mm width at every 180 degree seen from the axial direction.
