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ASF-Keystone says its spring manufacturing is differentiated by its process control, which assures consistency of dimensional, metallurgical and functional properties in final products. Its engineers can design springs for the most demanding requirements, the company says. All ASF-Keystone springs are made from alloy bar with a maximum seam depth of 0.001-inch to 1/16-inch bar diameter. All spring manufacturing processes include shot peening and heat treating.