This New Yorker Boiler flat washer is a standard component designed to distribute the load of a threaded fastener, such as a screw or nut. It is compliant with the Society of Automotive Engineers (SAE) specifications, indicating its suitability for heavy-duty applications. The washer has an inner diameter of 5/16 inches, providing ample space for various bolt sizes. It is made from plain steel (STL), known for its durability and resistance to wear and tear. This washer does not have any surface coating, making it ideal for applications where additional materials may interfere with functionality.