RS PRO Brass Threaded Insert Flush M3 Size, 4 mm Fixing Hole, 4.22 mm OD, 4.78 mm Depth, Model 278-534

RS PRO 278-534 Brass Threaded Insert is a high-quality flush type fastener designed for secure and reusable thread provision in plastics, sheet metals, and other engineering panels. Constructed from premium brass, this insert offers enhanced corrosion resistance compared to steel counterparts, ensuring long-lasting performance in industrial environments where both mechanical strength and ease of maintenance are required.

The flush configuration facilitates seamless integration into drilled or moulded holes, enabling smooth surfaces without protrusions. Its knurled outer surface delivers superior grip for reliable retention, actively resisting loosening from vibrations or stress. The expansion slot mechanism is purpose-built to self-lock upon screw insertion, anchoring the insert and delivering consistent holding force time after time.

Installation is straightforward: the insert can be pressed or hammered into the prepared hole, accommodating various manufacturing workflows. The 4 mm fixing hole compatibility and 4.22 mm outside diameter allow fitting into a wide variety of thin-walled panels, while the 4.78 mm depth secures the fastener within the material without compromising structure or accessibility.

Designed for M3 thread size, this brass threaded insert is ideal for technical assemblies requiring precision and easy maintenance, such as plastic casings, housings, and control panels in electrical, laboratory, and industrial equipment. Its robust engineering supports strong, reusable threads for bolts, screws, or other fastening hardware.

Expansion inserts like the RS PRO 278-534 are particularly suitable for thermoset plastics and rigid materials that permit expansion anchoring by the knurled body. This ensures high retention while enabling removal and reinsertion during product servicing. Applications range from electronics enclosures to laboratory apparatus, industrial control panels, and sheet metal fixture points.

Compliance with RoHS standards confirms suitability for regulated environments where material safety and environmental consideration are essential. The trusted RS PRO brand is recognized for rigorously tested industrial products aimed at professional engineers, ensuring confidence in demanding use cases from manufacturing to laboratory and technical maintenance.

Explore the full range of brass threaded inserts, fasteners, and engineering consumables from RS PRO in the Threaded Inserts category at EnvMart for reliable solutions tailored to industrial and laboratory requirements.