Need to keep those bolts from coming loose? These uxcell M4 split lock washers have you covered. Made from 304 stainless steel, they're built to handle corrosion and last through outdoor applications without rusting out on you. The black finish gives them a clean, professional look that works in various applications. You get 25 pieces in the pack, which is perfect for multiple projects or having spares on hand. The split design creates that spring action that helps prevent screws and bolts from backing out due to vibration - something flat washers just can't do. They're designed with a left-hand helix that works with right-hand tightening, applying constant tension to keep things secure. Perfect for electrical connections, appliances, furniture assembly, or any situation where vibration might loosen your fasteners over time. The trapezoidal shape really makes the difference - when compressed, it twists and flattens to maintain force even under vibration. Installation is straightforward - just slide them on before your nut or bolt head. No special tools needed, just reliable performance that keeps your projects secure.
Free 30-day returns 
Free 30-day returns
