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ISO 7380-2 Hexagon Socket Button Head Screws with Collar A2-70 304 Stainless Steel Allen Bolts. Manufactured to ISO 7380-2 standard, A2-70 stainless steel with passivation treatment, excellent rust & corrosion resistance. Smooth button round head, hexagon socket drive, easy installation, neat surface after fastening. Grade A precision metric thread, full sizes M3~M16, sample & bulk orders available. Suitable for electronics, cabinets, automation and outdoor assembly.