Stainless steel flange nut comes with integrated flange base, no extra flat washer required. It complies with GB/T6177 standard. Materials include SUS304(A2) and SUS316(A4). The flange surface enlarges contact area and disperses pressure to avoid workpiece damage. Anti-slip serrations improve anti-loosening performance. Corrosion resistant with passivated finish for easy assembly. Available in M5, M6, M8, M10, M12. Usually matched with T-bolts, widely used for aluminum profile frames, solar mounting brackets, assembly lines and outdoor machinery.