Extension Springs Characteristics and Shapes of Extension Springs After compression springs, extension springs are widely used, and they are characterized by the hooks at both ends. Further, in the case of manufacturing by tight winding in cold forming process, the initial tension of the extension springs is the most different from that of the compression springs. There are various hook shapes depending on the application, and stress concentration points are different in each, so caution is required when setting the stress. The hook shapes described in JIS B 2704 are as follows. 1.Machine Half Hooks The coil is half-bent to form a hook, which is easy to process. 2.Machine Hooks … Continue reading Extension Springs: Things To Note In Spring Design