Wisine brand 18-8 threaded rod PRODUCT DESCRIPTION 18-8 Stainless Steel is a chrome-nickel alloy and is the most widely used alloy of the stainless and heat resisting steels. It provides good corrosion resistance to chemicals and atmospheric conditions. It can be formed and welded. This alloy is non-magnetic. National Course Threads, Size is listed as Diameter - Threads per Inch. 18-8 Stainless Steel Fully Threaded Rod Size: 7/8 inch Threads per Inch: 9 Length: Varies Tolerances: Length: (+/- 1/8 inch).