Heavy Hex Lock Nut: Expanding Flex Top, 5/16-18, Grade 2 Steel, Bright/Uncoated MPN:20FA-518

The 5/16-18 UNC Grade 2 Heavy Hex Lock Nut with Expanding Flex Top is designed to provide a reliable and secure connection between bolts and fasteners, delivering torque transfer and grip for applications requiring higher strength. Its heavy hex design enhances gripping power and the expanding flex top adds extra security when properly tightened, preventing it from loosening during use. This nut meets the standards of American National Standard ANSI B1.1 and complies with Grade 2 specifications for common nuts under strength and mechanical properties. Due to its heavy-duty construction and high tensile strength, this locknut is ideal for professional mechanics, manufacturers, and maintenance workers in various industries working on constructions sites, automotive systems, or heavy machinery where durable nuts are necessary to keep equipment secure and tightened.