SS 321 Nut Bolt on the other hand was developed to provide better creep resistance and higher strength at higher temperatures. These alloy types cannot be hardened by heat treatment, only through cold working. Our SS 321 Nut Bolt find usage in Aerospace, Chemical processing, Petroleum refining and Waste treatment. We offer these WNR 1.4541 and WNR 1.487 Fasteners in various kinds such as SS 321 Nut Bolt and more. We have developed and designed these Fasteners to provide ultra high quality service. Our products undergo strict quality control checks to ensure they serve the purpose with utmost reliability. We maintain all international standards of quality in the manufacturing process.