High-Strength Internal & External Threaded Inserts

Free-running wire thread inserts that anchor by their own radial spring, for thread repair and reinforcement.

Key specifications

MaterialSUS304 Stainless Steel
Installationinstalled with a dedicated insert tap and driving tool
StandardGB/T 24425.1
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. Installation requires a special tap that cuts the base thread to the insert's specified pitch diameter, followed by a driving tool; tangless types need no tang break-off.

Material: SUS304 Stainless Steel. It is installed with the dedicated insert tap and its setting tool.

Key featuresFeatures

Load distributes across coils, spreading stress over more threads.
Wear occurs in the insert, not the base material, so the hole survives repeated assembly.
SUS304, SUS316 and phosphor bronze options; 316 for higher corrosion demand.
Tanged and tangless versions; tangless removes the break-off and retrieval steps.

Typical applicationsApplications

Magnesium structure thread repair
Aerospace light-alloy parts
Automotive engine and gearbox castings

Selection notesSelection

Insert length is usually 1.5D–2D; shorter lengths carry less load, longer ones add little and complicate installation.

Frequently asked questionsFAQ

How do I specify the High-Strength Internal & External Threaded Inserts?

Insert length is usually 1.5D–2D; shorter lengths carry less load, longer ones add little and complicate installation. Material: SUS304 Stainless Steel. It is installed with the dedicated insert tap and its setting tool.

What matters during installation of the High-Strength Internal & External Threaded Inserts?

Tap the hole with the dedicated insert tap, then drive the insert with its setting tool. Load distributes across coils, spreading stress over more threads.

Specifications

Standard	GB/T 24425.1
Material	SUS304 Stainless Steel
Wire tensile strength	≥1370 MPa (work-hardened condition)
Hardness	HV 380–450 (wire section, indicative)
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

After installation, threads are gauged and a pull-out test records the failure load.Alternative materials and finishes can be quoted side by side during sampling, so cost and corrosion resistance can be traded off explicitly.