Size: 3/8 inch-16. 4-sided shape. Screws onto a bolt, cap screw or threaded rod of the same thread size. Typically used in combination with a washer (not included). Not as commonly used as hex nuts. Thread Type: Coarse, Thread Class: UNC-2B. Specification(s) Met: ASME B18.2.2 and ASME 1.1.
