Requires a spanner. Metric Thread 8.8 BZP Socket Set Screw. Our RS Pro zinc plated 8.8 grade hexagon socket set screws are a fully threaded fastener and provide a moderate corrosion resistance. The socket set screws are suitable for you to use in a dry, indoor environment. These fasteners have bright zinc-plated finish ensuring an attractive, quality appearance and finish wherever they are used. Features and Benefits. Can be used with nuts or in a tapped hole. Typical Applications. Machinery and construction