Prevent your bolts, screws and nuts from coming loose with this internal tooth shakeproof washer. It's part of our trusted RS PRO range.

Made of stainless steel, this washer is not only resistant to corrosion but hardwearing and robust so it can keep your fasteners and joints secure. This particular washer, with its internal teeth, helpfully lock into screws and bolts. It therefore prevents vibration or heavy weight from loosening the screw. This feature makes the washer highly effective and a great choice for homes and workplaces.

This washer is designed to be used with M4 screws and bolts. Its internal diameter is 4.3 mm, and its overall diameter is 8 mm. As the teeth are internal, they'll look discreet when in place.

This washer is RoHS (Restriction of Hazardous Substances) compliant, so it contains only trace amounts of hazardous materials.

• Shakeproof washer
• Internal teeth
• For M4 screw and bolt size
• Inside diameter of 4.3 mm
• Outer diameter of 8 mm
• Thickness of 0.5 mm
• Made from corrosion-resistant stainless steel (type A4 316)
• Plain finish
• Conforms with manufacturing norm DIN 6798J for serrated lock washers (Deutsches Institut für Normung, or the German Institute of Standardisation)
• RoHS compliant

RS PRO is our own brand range and brings you a wide range of high-quality, great value products offering you more choice. Trusted by engineers all over the world, every part of every RS PRO product has been rigorously tested against demanding industry standards