Product: 60 × external toothed star discs (silver tone) - Pack contents: 60 pieces - Inner diameter: M8 (fits M8 bolts/shafts) - Outer diameter: 15 mm (0.59 in) - Colour: silver tone - Material: 304 stainless steel Why you need these discs - Prevents loosening: the external toothed star design creates spring force between the fastener head and the base material, increasing friction and rotation resistance to reduce bolt or nut backing off under vibration. - Even load distribution: the external teeth help spread the tightening force across the contact area so clamp pressure is distributed more evenly and seals remain held firmly against the surface. - Durable and corrosion-resistant: made from 304 stainless steel for high strength, hardness, wear resistance and long-term corrosion protection in typical indoor and outdoor environments. - Easy to use: push- or twist-on installation onto the shaft makes fitting quick and convenient without special preparation. Key features - Function: external star/toothed washer that provides spring action and anti-rotation friction between mounting head and substrate. - Compatibility: sized for M8 inner diameter; designed for use with M8 bolts, studs or shafts. - Size and finish: 15 mm outer diameter with smooth, bright silver-tone finish. - Quality: stamped to standard dimensions for consistent fit and performance. Typical applications - Automotive and motorcycle assemblies: secure brackets, clamps and fasteners subject to vibration in engine bays and chassis components. - Electrical enclosures and control panels: improve connection stability and grounding retention where fasteners may loosen over time. - Machinery, appliances and HVAC: fasten panels, mounts and fittings that require reliable anti-loosening performance and corrosion resistance. Installation note - Fit by pushing or twisting the disc onto the bolt or shaft until seated beneath the fastener head. Ensure correct orientation of the external teeth against the mating surface for optimal locking and load distribution.