Wire Thread Insert

Helical wire insert that repairs a damaged thread or reinforces a soft one, in a standard tapped hole.

Key specifications

MaterialSUS304 Stainless Steel
StandardGB/T 24425.1
Wire tensile strength≥1370 MPa
HardnessHV 380–450

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Product overviewOverview

The insert is a helical coil wound from diamond-section austenitic stainless wire that has been cold-rolled and work-hardened. Its free diameter is larger than the tapped hole, so it is wound in under pre-tension and springs outward against the thread flanks; retention comes from that radial spring load, not from an adhesive or a key. The inner profile of the wire becomes the working thread, and because the coil is elastic it spreads load over the full engaged length and tolerates small lead and pitch differences between the bolt and the tapped hole.

Material: SUS304 Stainless Steel.

Key featuresFeatures

Available tanged (tang broken off) or tangless (no loose piece).
Work-hardened in the as-drawn condition; hardness is reported on the wire section as HV 380–450, since austenitic stainless does not respond to hardening heat treatment.
Diamond-section 304 stainless wire, work-hardened to a tensile strength of 1370 MPa or above.
Radial spring load holds the coil in the tapped hole without adhesive.

Typical applicationsApplications

Repair of damaged threads in castings and housings
Aluminium and magnesium components with frequent service
Automotive and motorcycle engine assemblies

Selection notesSelection

Specify the STI tap together with the insert: the tapped hole, the insert length in diameters and the bolt engagement are one dimension chain, not three separate choices.

Frequently asked questionsFAQ

How do I specify the Wire Thread Insert?

Specify the STI tap together with the insert: the tapped hole, the insert length in diameters and the bolt engagement are one dimension chain, not three separate choices. Material: SUS304 Stainless Steel.

What matters during installation of the Wire Thread Insert?

Check the installed insert with a go/no-go gauge on the internal thread before the bolt goes in Available tanged (tang broken off) or tangless (no loose piece).

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)

Manufacturing and inspection

Installed inserts gauged with a go/no-go plug gauge, and the first and last thread checked for position against the surface.Alternative materials and finishes can be quoted side by side during sampling, so cost and corrosion resistance can be traded off explicitly.