RS PRO, M3 Brass Threaded Insert diameter 4mm Depth 4.78mm

A range of expansion inserts suitable for use with most plastic materials, using either through or blind holes. Knurled outer diameter with expansion slots prevent rotation or loosening due to vibration and ensures consistent self-locking pressure on the fixing screws

Use in drilled or moulded-in holes
Install by simple press or hammer-in methods

Available with Flush Head (RS 278-534, RS 278-540, RS 278-556, RS 278-562, RS 278-578)
Available with Flange Head (RS 278-584, RS 278-590, RS 278-607, RS 278-613, RS 278-629)

Threaded inserts are available in various materials and finishes and metric course threads to suit every application. Expansion inserts are ideal for plastics which can resist the expansion of the insert but also flexible to let the knurls anchor into the material. Threaded expansion inserts are designed to provide strong reusable threads in thermoset and other hard plastics and are commonly used in plastic casings and housing.

RS PRO
RS PRO is our own brand range and brings you a wide range of high-quality, great value products offering you more choice. Trusted by engineers all over the world, every part of every RS PRO product has been rigorously tested against demanding industry standards; they’re only given the RS PRO Seal of Approval if we’re confident of their exceptional quality, which means you can be confident too.