40 Pcs M4 Countersunk Cup Washers, 304 Stainless Steel | 4mm ID 13mm OD, Decorative Flush Washers For Screws

About This Product

Need washers that look good AND work hard? Check out these 304 Stainless Steel Cup Washers. You get a pack of 40, perfect for M4 size screws (that's a 4mm inner diameter and a 13mm outer diameter). They're made from premium 304 stainless steel, which means they're super strong, corrosion-resistant, and won't rust—great for indoor or outdoor projects. The cool 'cup' or countersunk design isn't just for looks (though it does make your screw heads look sleek and finished). It actually helps distribute the pressure from the screw over a wider area. This protects softer surfaces like wood or plastic from getting crushed or damaged. They're super easy to install—no special tools needed—and the tapered edge helps guide the screw right into place. Use them for furniture assembly, DIY crafts, automotive projects, robotics, or any industrial application where you want a clean, flush finish and extra protection. A simple upgrade that adds both function and a professional touch.