Material: Carbon steel+nylon
Size: Inner Diameter - 4mm, Outer Diameter - 8mm, Height - 4mm
1. Nylon insert hex lock nut
2. Carbon steel frame with zinc plated, solid frame, anti-rust, long lifetime
3. Nylon inserted self lock design, good shockproof and sealing propertity and avoid from loosing efficiently during usage
4. Widely used in railway, mechanical equipment, mining devices, aerospace devices, automobile, etc.
4 x Nylon Insert Lock Nuts