The most common material types that tension spring suppliers like Acxess Spring use include Music Wire ASTM A228, Hard Drawn ASTM A227 Stainless Steel 302 A313, Stainless Steel 17-7 A313, Stainless Steel 316 A316, Chrome Silicon A401, and Oil Tempered MB A229. You may also choose from several hook types. Whether you want either machine hooks, cross over center, side hooks, extended hooks, or no hooks. All of these modifications affect your spring’s force along with load and travel capacities. This is why we provide you with the perfect tool to create a spring design; Spring Creator.