RS PRO 6 mm Bright Zinc Steel Pan Head Sems Screw, External Tooth Washer, M3 Thread, Pozidriv Drive 278-641

The RS PRO 278-641 is a precision-engineered 6 mm bright zinc-plated steel SEMS screw with a pan head, Pozidriv drive, and integrated external tooth washer. Designed to streamline assembly processes and enhance fastening reliability, this screw is particularly well-suited for critical industrial applications, including electronic assemblies, control systems, and machinery construction.

This fastener combines the convenience of a pre-assembled SEMS construction - comprising a captive external shake-proof washer - with the robustness of bright zinc-plated steel. The zinc finish not only creates an appealing appearance but also delivers outstanding resistance to corrosion, making the screw suitable for use in environments prone to moisture or chemical exposure. The pan head and Pozidriv drive allow precise, secure installation while reducing the risk of cam-out or over-tightening.

Its 6 mm length and standard M3 coarse thread make it compatible with a variety of metric components, ensuring wide utility across PCB assembly, drone sub-assemblies, battery packs, connector assemblies, and equipment enclosures. The external tooth washer enhances vibration resistance and electrical contact, which is especially valuable in sensitive electronic and avionic equipment.

With compliance to BS 4183 and DIN 6797A, this screw is manufactured for environments where quality, durability, and ease of installation are prerequisites. The pre-assembled design reduces inventory management complexities and minimizes installation time by integrating the washer and screw into a single part, thereby also preventing washer loss during handling.

Applications span across industrial electronics, avionic control panels, infrared camera mounts, naval and ground fire control systems, PCB (Printed Circuit Board) mounting, connector assemblies, and more - anywhere that demands a reliable, vibration-proof, and corrosion-resistant fastening solution.

The RS PRO 278-641 SEMS Screw represents a high-quality, efficient solution for assembly operations in both high- and low-volume manufacturing settings, maintaining dependable mechanical and electrical connections throughout the product lifecycle.

Explore the full RS PRO range to find additional Machine Screws and fastening solutions tailored to industrial, electronic, and manufacturing requirements.