In this study, we compare the performance of the screw through the Clamping force of the test materials to change shape and structure, one of the ways to maintain and improve the engaging force to cope with the miniaturization of the fastener threads are further thinner and lighter precision way that can improve the fastening force of the screw results were as follows. The clamping force according to the materials was 7.57Nㆍcm in SUS XM7 and SWCH18A was 5.97 Nㆍcm. This result was to be found to average 13.5% high in the Clamping force of SUS XM7 materials. In the case of the clamping force of the screw thread shape change, the clamping force of symmetrical and asymmetrical thread was 6.78 Nㆍcm and 7.57 Nㆍcm. The clamping force of the asymmetrical thread showed an average high of 11.6%.
