RS PRO Brass Threaded Insert M3 Flanged 4 mm Hole, 4.22 mm OD, 4.78 mm Depth, Model 278-584

RS PRO Brass Threaded Insert model 278-584 is a high-performance industrial fastening component designed for secure installation in plastics, metals, and composites. This insert features an M3 metric thread, a flanged head, a 4 mm fixing hole diameter, and a robust knurled outer diameter measuring 4.22 mm, with a depth of 4.78 mm. Its durable brass material ensures excellent corrosion resistance, making it suitable for demanding environments.

The flanged design allows improved holding strength and prevents the insert from pulling through materials during assembly. Its knurled slot structure provides a strong grip, inhibiting loosening caused by vibration and delivering consistent self-locking pressure on fastening screws. The insert can be easily installed by press or hammer action into drilled or moulded holes, streamlining production and maintenance tasks.

Durable brass construction ensures reliable performance and corrosion resistance. Flanged design delivers secure fastening in plastic, metal, or composite materials. Knurled outer diameter provides enhanced grip and self-locking action against vibration.

Compatible with M3 metric course threads, suitable for drilled or moulded holes. Simple press or hammer installation for convenient use in assembly operations. Expansion slot mechanism prevents rotation and loosening over time.

Fits minimum material thickness of 6.2 mm for versatile fabrication needs. Ideal for applications in industrial casings, panels, housing, and electronic enclosures.

Threaded expansion inserts like this RS PRO model are frequently used to provide strong, reusable threads in thermoset and hard plastics. The expansion slot mechanism activates when a screw is inserted, expanding the insert and locking it firmly into place, which is especially beneficial for vibration-prone or high-use installations. The product is RoHS compliant, fitting industrial, mechanical, electronics, and fabrication use cases where secure fastening and repeatable threads are essential.

Browse more industrial fasteners from RS PRO and discover high-quality Threaded Inserts for a wide range of demanding applications.