RS PRO Brass Flanged Threaded Insert M4, Fixing Hole Diameter 5.6 mm, Depth 7.95 mm, Expansion Type 278-607

The RS PRO 278-607 Brass Flanged Threaded Insert is an expansion-type fastening solution designed for robust metric M4 threading in plastic and panel materials. Featuring a knurled outer diameter and expansion slots, this insert provides strong, vibration-resistant, and reusable threads for secure mounting of screws, bolts, and other hardware. The flange head design allows for stable seating, improving axial holding strength and preventing pull-through.

With a fixing hole diameter of 5.6 mm and an outside diameter of 5.64 mm, the insert fits drilled or moulded holes precisely. Once installed, insertion of a screw expands the insert, activating self-locking mechanisms for consistent pressure and secure threaded engagement. The minimum required material thickness is 9.4 mm, and the insert depth is 7.95 mm, supporting reliable thread engagement and structural integrity. Made from corrosion-resistant brass, this component withstands demanding conditions while providing durability and a long service life.

Installation is straightforward - press or hammer the insert into a predrilled hole, then secure with a suitable metric M4 screw or bolt. The knurled exterior enhances grip within plastics, preventing rotation and loosening, especially in environments subject to vibration. Typical applications include mounting in plastic casings, electronic housings, panel fastenings, and sheet metal assemblies across industrial, manufacturing, and commercial settings.

Expansion inserts like this RS PRO model are widely used to provide strong, reusable threads in thermoset and hard plastics where threaded engagement and repeated assembly/disassembly are required. The brass material offers superior corrosion resistance compared to zinc or steel alternatives, making it suitable for electronics, HVAC, laboratory equipment, machine enclosures, and robust fastening needs.

RS PRO products are known for comprehensive quality and reliability, ensuring industrial engineers, technicians, and manufacturers benefit from consistent performance and value. This M4 flanged insert complies with RoHS standards and is rigorously tested for demanding industry environments.

To explore additional fasteners, panel fixings, and expansion inserts from RS PRO and similar brands, browse the Industrial Fasteners section at EnvMart.

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