60 Pcs M4 ID X 9Mm OD Flat Washers, Stainless Steel Metal Washers

What is this?Flat washers can prevent fastener loosening under vibration or dynamic loads. Suitable for interior decoration, outdoor construction, electrical maintenance, furniture repair, outdoor construction, automotive manufacturing, mechanical processing, pipeline connection, electronic equipment, machinery, marine uses.What will I get?Color: Black; Inner Diameter: 4.5 mm / 0.18 inch; Outer Diameter: 9 mm / 0.35 inch; Thickness: 0.8 mm / 0.03 inch; Packing List: 60 Pcs x Flat WashersIs there any advantages of the product?Corrosion-Resistant:Black electroplated flat washers are crafted from 304 stainless steel, offering superior resistance to rust, oxidation, and wear for long-lasting performance.Reliable Sealing Performance:The black flat washers ensure a tight seal around fasteners, preventing loosening even under continuous vibration or dynamic stress.How to use it?Position the washer under the head of a bolt or nut to provide a smooth load-bearing surface, and tighten the fastener gradually to ensure even pressure distribution.What should I notice?To ensure optimal performance, verify that the washer's inner diameter is suitable for your screw/bolt size. When tightening, apply moderate force to avoid deformation and maintain sealing integrity.