Machine screws are used for all types of installations where a fully threaded metric screw is required.

The screw is produced in hardened carbon steel in grade 4.8 with bright zinc plated surface treatment. The screw has a round head with a PH bit drive.

In order for a bolted joint to work correctly and be able to counter static and varying loads for long periods the bolts must be preloaded, for example, by tightening with a given torque. Preloading must normally be held to such a level that the combined load in the bolt does not exceed the bolt material’s tensile yield limit. For the correct installation of a machine screw grade 4.8 to be correct a flat washer of at least HV140 hardness should be used.