High-Precision Threaded Insert

Self-tapping threaded insert: it cuts its own thread in the pilot hole, so no STI tapping operation is needed.

Key specifications

MaterialStainless Steel / Carbon Steel
Installationinstalled with a dedicated insert tap and driving tool
StandardGB/T 24425.1 (free-running wire thread insert)
Typical substratealuminium, magnesium, cast iron, engineering plastics
Key inspectionsfree diameter, post-install gauging, pull-out

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Product overviewOverview

The principle is compliance for strength: radial springiness absorbs the pitch interference of tightening and reduces galling, while wear moves to a replaceable insert so the base thread survives repeated assembly. Cutting its own thread removes one process step and one tool, but it also means the base material has to be ductile enough to be cut cleanly and strong enough to hold the formed thread. In brittle or very soft material the thread tears instead of forming, and pull-out falls sharply.

Material: Stainless Steel / Carbon Steel. It is installed with the dedicated insert tap and its setting tool.

Key featuresFeatures

Saves the tapping step, but needs a ductile base material.
Diamond-section stainless wire, with hardness and tensile strength verified to the GB/T 24425 series.
Radial spring anchors the insert without adhesive; service range depends on material, commonly −50 °C to +300 °C.
The load spreads along the coils rather than sitting on the first thread, which is why the base material survives higher bolt loads.

Typical applicationsApplications

Automotive engine and gearbox castings
Medical and instrument lightweight frames
Aluminium die-cast housings

Selection notesSelection

Check base material ductility and pilot hole size before committing; the pilot diameter is specific to the insert and is not the same as a tapping drill for the finished thread.

Frequently asked questionsFAQ

Can a self-tapping insert be used in hard aluminium?

Hard alloys cut less cleanly and the thread can tear, so pull-out drops. Trial on the actual alloy and temper, and check the driving torque against the failure torque before releasing the process.

What matters during installation of the High-Precision Threaded Insert?

Tap the hole with the dedicated insert tap, then drive the insert with its setting tool. Saves the tapping step, but needs a ductile base material.

Specifications

Material	Stainless Steel / Carbon Steel
Type	Self-tapping threaded insert
Standard	GB/T 24425.1 (free-running wire thread insert)
Installation	installed with a dedicated insert tap and driving tool
Typical substrate	aluminium, magnesium, cast iron, engineering plastics
Key inspections	free diameter, post-install gauging, pull-out

Manufacturing and inspection

Free diameter, coil count and free length are sampled to GB/T 24425, with material verified by spectrometry.We recommend a pilot assembly at the actual torque and mating part before locking the process parameters for volume.