Tangless Thread Inserts

Tangless thread insert: the same coil without a driving tang, so no break-off step and no loose tang in the assembly.

Key specifications

MaterialSUS304 Stainless 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 insert is a diamond-section stainless wire wound into a coil with an external thread on the outside and an internal thread on the inside. A tanged insert is driven by a tang that is notched and snapped off afterwards, and the broken tang is a foreign object that has to be controlled. A tangless insert is driven by a tool that engages the coil itself, which removes both the step and the loose piece, at the cost of a dedicated tool.

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

Key featuresFeatures

No tang to break off, so no foreign object in the assembly.
SUS304, SUS316 and phosphor bronze options; 316 for higher corrosion demand.
Tanged and tangless versions; tangless removes the break-off and retrieval steps.
Diamond-section stainless wire, with hardness and tensile strength verified to the GB/T 24425 series.

Typical applicationsApplications

Aerospace light-alloy parts
Automotive engine and gearbox castings
Medical and instrument lightweight frames

Selection notesSelection

Where FOD control matters, tangless is the default even at higher tooling cost; where cost dominates and the assembly is cleaned afterwards, tanged inserts remain acceptable.

Frequently asked questionsFAQ

Is a tangless insert as strong as a tanged one?

The installed coil is equivalent; the difference is in installation and in the absence of the tang notch. Strength comes from the coil and the tapped hole, not from how it was driven.

What matters during installation of the Tangless Thread Inserts?

Tap the hole with the dedicated insert tap, then drive the insert with its setting tool. No tang to break off, so no foreign object in the assembly.

Specifications

Material	SUS304 Stainless Steel
Type	Tanged-free 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

Surfaces are checked for burrs and cracks; tanged parts are checked for a clean break after driving.Material certificates and dimensional records accompany each lot; material and dimensional records are supplied per batch.