1、Stainless Steel A2‑70: The flanged round head hex socket screw is made of stainless steel A2‑70, which has a high degree of chemical resistance and corrosion resistance. 2、Wider Support Surface: The low arched cutter head with a wider support surface provides a perfect appearance and is ideal when a neat appearance is required. 3、Application: This flange button head hex socket screw is very suitable for using in wood and wet environments. 4、Wide Application: This flange button head hex socket screw kit can be widely used for construction, automobile and product manufacturing. 5、Beautiful and Clean Appearance: The hex socket screws with flange button head have a beautiful and clean appearance, which is very suitable for furniture and other projects. 50 x M4x30mm Flange Bolts Item Type: Flanged Button Head ScrewsMaterial: A2-70 Stainless SteelStandard: ISO 7380 Model  M3 M4 M5 M6 M8 Thread Diameter(Approx.) 3mm / 0.12in 4mm / 0.16in 5mm / 0.20in 6mm / 0.24in 8mm / 0.31in Pitch(Approx.) 0.5mm / 0.02in 0.7mm / 0.027in 0.8mm / 0.03in 1mm / 0.04in 1.25mm / 0.05in Head Diameter(Approx.)  7.1mm / 0.28in 9.4mm / 0.37in 11.8mm / 0.46in 13.6mm / 0.53in 17.8mm / 0.70in Head Height(Approx.)  1.65mm / 0.06in 2.2mm / 0.09in 2.75mm / 0.11in 3.3mm / 0.13in 4.4mm / 0.17in Hex Socket Size(Approx.) 2mm / 0.08in 2.5mm / 0.10in 3mm / 0.12in 4mm / 0.16in 5mm / 0.20in