340-Piece Internal Tooth Washer Kit

A complete assortment of 340 internal tooth star lock washers spanning seven essential metric dimensions: M3 (9 mm), M4 (12 mm), M5 (12 mm), M6 (14 mm), M8 (18 mm), M10 (20 mm), and M12 (25 mm). Fabricated from high-strength 65 manganese steel and coated with black oxide to ensure resistance to rust, abrasion, and thermal degradation. The star profile provides reliable locking through elastic deformation, increasing static friction and inhibiting self-loosening under cyclic loads. Commonly deployed in mechanical engineering projects, flat-pack furniture builds, control panel wiring, automotive interior fittings, cycle component servicing, and factory floor jigs where secure, serviceable joints are mandatory. All components are housed in a durable, see-through plastic sorting box with an embossed size legend for immediate recognition and space-efficient benchtop or cabinet storage.