Flat Washer

The Zinc Plated Round Flat Washer is a versatile, cost-effective auxiliary fastening part designed to evenly disperse clamping pressure, protect workpiece surfaces and increase contact area during bolt and nut assembly for machinery, furniture, solar and general industrial applications. With a smooth flat circular body and precision central hole, this flat washer eliminates concentrated stress, prevents indentation and deformation of soft substrates, and stabilizes connection tightness for long-term reliable fastening.

Made from high-quality grade 4.8 or 8.8 carbon steel, the round flat washer features excellent compression resistance and structural stability. The surface undergoes blue-white electro zinc plating treatment, forming a uniform dense zinc anti-rust layer that isolates air and moisture, slowing oxidation and surface corrosion. This protective coating extends service life and maintains stable performance under indoor and mild outdoor working conditions.

The wide smooth circular surface expands the bearing contact area greatly. When tightening fasteners, it evenly spreads bolt pressure to avoid local pressure damage to metal, plastic, wood and painted surfaces. The precisely sized central hole fits standard metric bolts seamlessly, and the smooth flat profile avoids jamming during automatic assembly. It effectively fills small gaps and prevents loosening caused by uneven contact surfaces.

Round flat washers are widely applied in general mechanical equipment assembly, furniture hardware connection, solar panel bracket installation, electrical cabinet fixing, building steel structure assembly, automotive parts fastening and pipeline support systems. Its universal size range and balanced cost-performance make it the most commonly used pressure-distributing washer for all conventional assembly projects.

We offer full OEM and ODM customization services, supporting tailor-made production based on customer drawings, samples and special technical requirements. Custom inner hole diameters, outer diameters, thicknesses, zinc coating thickness and export packaging styles are available to meet different project demands. Private labeling, laser marking and custom brand printing are also supported for hardware distributors, machinery factories, solar manufacturers and construction contractors.

Every zinc plated round flat washer is manufactured under strict fastener quality control standards. All finished washers pass full dimensional inspection, flatness testing and surface coating uniformity check before shipment, to guarantee accurate hole size, smooth flat surface and consistent anti-corrosion zinc coating for every product batch.