SelfSert-S Single-Slot Self-Tapping Insert M4×8 Carbon Steel

Overview

The SelfSert-S is the cutting variant of the self-tapping insert family: its external thread has cutting edges that remove material rather than displacing it. That makes it suitable for brittle or hard materials, and for thin bosses where forming would crack the wall instead of deforming it. This listing: thread M4, standard ISO metric thread, material Case-hardened steel, finish Blue zinc passivated, features Single-slot cutting self-tapping.

What sets this listing apart: Thread Diameter M4 (series runs M2 to M30).

Advantages

Lower installation torque than a forming insert of the same size, reducing hoop stress on thin housing walls.

Chips are small and controllable, and the cutting action gives a cleaner thread in materials that do not flow.

Same shoulder-stop installation as the forming variant, so installed depth stays repeatable on automated lines.

Cutting geometry works in brittle materials such as glass-filled nylon, die-cast zinc and hard engineering plastics where a forming insert would crack the boss.

Applications

Glass-filled engineering plastics, die-cast zinc and magnesium, hard thermosets, and thin-wall bosses where a forming insert risks cracking.

Cutting inserts generate chips: on sealed assemblies confirm the chip path or specify a design that traps debris. In very brittle plastics, pre-drill to the exact recommended diameter — an undersized hole will crack the boss before the insert seats.

Product information is supplied by Toprecision. Custom parts can be produced to drawing — contact us for samples or a quotation.