Brass Inserts for Thread Reinforcement in Plastics

Brass inserts moulded or heat-set into plastic parts to provide a metal internal thread.

Key specifications

MaterialBrass C3604
Installationheat staked, ultrasonically inserted or moulded in
StandardGB/T 197 (6H), GB/T 4423 (brass rod)
Typical substrateABS, PC, PA and other engineering plastics
Key inspectionsthread gauging, insertion torque, pull-out

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Product overviewOverview

A plastic thread loses strength after a few assembly cycles. A brass insert is embedded by heat staking, ultrasonic insertion or in-moulding; knurls, nets or slots on the outside grip the plastic mechanically, while the brass carries the internal thread and delivers metal-grade joint strength.

Material: Brass C3604. It is heat-staked, inserted ultrasonically, or moulded in.

Key featuresFeatures

Brass conducts heat well, so heat staking melts the plastic evenly and thread flanks stay clean.
Knurl or net patterns grip the plastic mechanically, outperforming a tapped hole.
6H internal thread survives repeated assembly without damaging the plastic.
Flanged versions spread bearing load on thin walls.

Typical applicationsApplications

Appliance housings and panels
Automotive interiors and lamp bodies
Electronic plastic enclosures

Selection notesSelection

For heat staking, the insert should be 10–20 °C above the plastic melt point: too cool gives poor grip, too hot degrades the polymer.

Frequently asked questionsFAQ

How do I specify the Brass Inserts?

For heat staking, the insert should be 10–20 °C above the plastic melt point: too cool gives poor grip, too hot degrades the polymer. Material: Brass C3604. It is heat-staked, inserted ultrasonically, or moulded in.

What matters during installation of the Brass Inserts?

Heat-stake it, insert it ultrasonically, or mould it in. Brass conducts heat well, so heat staking melts the plastic evenly and thread flanks stay clean.

Specifications

Material	Brass C3604
Standard	GB/T 197 (6H), GB/T 4423 (brass rod)
Installation	heat staked, ultrasonically inserted or moulded in
Typical substrate	ABS, PC, PA and other engineering plastics
Key inspections	thread gauging, insertion torque, pull-out

Manufacturing and inspection

Internal threads are gauged 6H on every part; outside diameter and knurl depth are sampled.We recommend a pilot assembly at the actual torque and mating part before locking the process parameters for volume.