An Internal Tooth Lock washer is a flat, circular-shaped washer. It is used to create tension and resistance against the rotation of the threaded fastener it is paired with. When a bolt or screw is tightened, the lock washer is compressed between the nut and the surface, and the internal teeth bite into both mating surfaces.Attributes:• Ensures a proper fit and reliable performance• To fit the fastener size of M4.2, M4, and #8• Create additional friction between the nut and the mating surfaceApplications:An Internal Tooth Lock washer is used to prevent loosening or unscrewing of threaded fasteners, such as screws or bolts.