Coarse 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 applicationsCORROSION-RESISTANT FINISH: Zinc plating offers moderate protection against rust and corrosionINSTALLS EASILY: Fasten with screwdriver to reduce risk of over-tighteningPRE-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 finishSTRONG COARSE SCREW THREAD: Sturdier thread than wood screws, made finer and more preciselyThese combination-drive, truss-head machine screws feature coarse #8-32 thread and measure 5/8" in length