· By hook style: round hook tension spring, long hook tension spring, cross hook, right-angle hook, double-ear hook, and special-shaped hook
· By structure: no initial tension spring, with initial tension spring
· By material: carbon steel tension springs, stainless steel 304/316 tension springs, piano wire tension springs, phosphor bronze tension springs
· By application: General industrial tension springs, precision electronic tension springs, fitness equipment tension springs, mechanical tension springs for doors and Windows
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