M5 DIN9021 Plastic large washer for screw M5

The M5 DIN9021 black plastic large washer for screw M5 is light and sturdy, lighter than its metallic counterpart, and lighter is often better, just ask anyone who is passionate about aeromodelling. Thanks to its dielectric properties, electricians often use these screws, nuts and washers. Not only does it insulate effectively, it prevents corrosion (doesn't rust), comes in handy in humid or aggressive environments (swimming pool, filter and pump rooms, boats) and is resistant to most chemical agents.