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For nearly a century, ASF-Keystone has been a design leader in coil springs, designing and manufacturing coils for railroad freight cars, locomotives, agricultural, military, industrial equipment and the trucking industry, the company says. ASF-Keystone makes springs from round bar stock 3/8-inch to 3-3/8-inch diameter using the extended life process pioneered by ASF-Keystone consisting of direct quenching, shot peening and testing.