Cap Nut, 1/2-13, Steel, Zinc Plated, 5 PK
They cover the end of the bolt tip, which protects the threads and provides a finished appearance. Size: 1/2 inch-13Domed top covers and protects threadsCreates a finished appearanceAlso known as an acorn nutExposed threads should not be longer than inside height of cap nutThread Type: Coarse, Thread Class: UNC-2BSpecification(s) Met: ASME B1.1 Since protruding bolt tips can catch skin or clothing, use of cap nuts can also help to prevent injury.