Midwest Fastener 4-40 Keps Lock Nut

The Midwest Fastener 4-40 Keps Lock Nut is designed for dependable performance in electronic assemblies, precision machinery, and light-duty fastening applications. Built with an integrated free-spinning external tooth lock washer, it bites into the mating surface to create consistent locking tension and prevent accidental loosening caused by vibration or movement. Constructed from durable steel with a corrosion-resistant zinc finish, this lock nut provides lasting strength and reliability. The coarse thread design allows for smooth threading and fast installation, making it an essential hardware component for maintenance, repair, and manufacturing needs.