Item Type: Flanged Button Head Screws Material: A2-70 Stainless Steel Standard: ISO 7380 Model M3M4M5M6M8 Thread Diameter(Approx.)3mm / 0.12in4mm / 0.16in5mm / 0.20in6mm / 0.24in8mm / 0.31in Pitch(Approx.)0.5mm / 0.02in0.7mm / 0.027in0.8mm / 0.03in1mm / 0.04in1.25mm / 0.05in Head Diameter(Approx.) 7.1mm / 0.28in9.4mm / 0.37in11.8mm / 0.46in13.6mm / 0.53in17.8mm / 0.70in Head Height(Approx.) 1.65mm / 0.06in2.2mm / 0.09in2.75mm / 0.11in3.3mm / 0.13in4.4mm / 0.17in Hex Socket Size(Approx.)2mm / 0.08in2.5mm / 0.10in3mm / 0.12in4mm / 0.16in5mm / 0.20in 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 M4x40mm Flange Bolts Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.