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Metric machine screws are fastening screws with a machine-cut thread throughout the length of its shank. Machine screws are used with nuts or screwed directly into a threaded receptacle to fasten various components together in machines, tools, etc.Ideal for metal fastening – machine screws are engineered for metal-on-metal fastening applications,Corrosion-resistant finish – zinc plating offers moderate protection against rust and corrosion,Installs easily – fasten with screwdriver to reduce risk of over-tightening,Pre-drilling recommended – for installation, drill a hole in the material that matches the diameter of the bolt, and install with a nut of similar size and finish,Strong coarse screw thread – sturdier thread than wood screws, made finer and more precisely