@renegadeusashop: A locking nut for an angle grinder is a special fastening nut that secures cutting discs, grinding wheels, flap discs, or polishing attachments onto the grinder’s spindle. Here’s how it works and why it’s used: • 🔧 Purpose: It holds the accessory firmly in place while the grinder spins at high speed, preventing slippage or wobbling. • ⚙️ Design: Most locking nuts are low-profile and feature grooves or holes for the grinder’s wrench (or a quick-release system) to tighten or loosen them. • 🔄 Types: • Standard lock nut – tightened/loosened with the grinder’s spanner wrench. • Quick-release/quick-change nut – tool-free design that allows fast disc changes by hand. • 📏 Fitment: They’re typically threaded to match the grinder spindle (commonly M14 in Europe/Asia or 5/8”-11 in North America). In short: it’s the piece that locks your wheel or disc securely onto the angle grinder spindle so you can work safely and efficiently. @Polish hub @Renegade Products USA