Electrical Screw

About Electrical Screw

Electrical screws are terminal and connection fasteners used to clamp conductors, busbars, earthing tags and components inside switchgear, terminal blocks, sockets, junction boxes and control panels. Because they carry both a mechanical clamping duty and an electrical contact duty, the design priorities are reliable, vibration-resistant clamping and a low, stable contact resistance. Common variants include terminal (clamping) screws with a captive plate or upset thread end to hold without crushing strands, combination (combi) head screws that accept multiple drivers, earthing screws often marked with the protective-earth symbol, and self-tapping versions for sheet enclosures. Head and drive types span slotted, Pozidriv, Phillips and combi to suit assembly tooling, and many are supplied as captive sems assemblies with a retained washer. Material selection is central: steel (usually zinc-plated or nickel-plated) for general clamping, brass for good conductivity and corrosion resistance in live contact points, and stainless for corrosive or earthing duty. Thread engagement, plating and any anti-vibration feature all bear on long-term contact integrity. On the configuration side, the controlling variables are conductor and terminal size for thread choice, material for the contact duty, plating type and thickness for conductivity and corrosion, drive type for the assembly tooling, and the clamping torque the joint is rated to hold without loosening under vibration or thermal cycling. Manufacturers generally verify plating thickness, torque and dimensions on a sampling basis. Where specified, Himalay coordinates material traceability, plating-thickness and salt-spray corrosion data, mechanical (torque) test records and RoHS/REACH declarations, with conformity routes for the destination market arranged where required, coordinated as part of the standard order flow.

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