Brass Moulding Inserts

Brass Moulding Inserts are precision-engineered threaded components designed to be installed into thermoplastics and thermoset materials to provide strong, wear-resistant internal threads.

They are suitable for mould-in, heat-set, ultrasonic, and press-fit installation methods. These inserts deliver high pull-out and torque resistance, ensuring secure fastening in plastic components across automotive, electrical, electronics, and industrial assemblies.

• Brass moulding inserts are small metal components (usually made of brass) that are moulded into or inserted post-moulding into plastic, wood, or other soft substrates. 

• Their main job is to provide strong, durable threaded holes in materials that would otherwise be too weak or soft to hold a screw reliably.

• Typically made from free-cutting brass (for example, IS 319 Type I, or BS 249 Type I) for ease of machining and good mechanical properties.

• More advanced or custom grades may also be used (depending on customer spec) — to provide better strength, corrosion resistance, or thermal behavior.

• They support a wide variety of internal thread standards, such as: ISO Metric, UNC, UNF, BSW, BA, BSP, etc., depending on the manufacturer.

• Their internal thread dimensions are typically maintained to very tight tolerances (“Go & Not Go” standards) to ensure fit and reliability.

• Knurling: The outer surface often has a knurled pattern (such as diamond knurl, straight knurl, or unidirectional knurl) to improve grip with the material into which the insert is embedded.

• Grooves: Some inserts have deep grooves to maximise pull-out resistance (i.e., resistance against being pulled out when a screw is used).

• Shapes: Available in multiple outer shapes — round, hexagonal, square — depending on use-case and required orientation/grip.

•  

Depending on how / when they’re placed, there are different types:

• Mould-in inserts: These are placed inside the mold core before plastic injection, so that once plastic is injected, the insert becomes an integral part of the plastic component.

• Press-in inserts: Inserted into pre-moulded / drilled holes using a press. Useful for softer plastics.

• Ultrasonic inserts: Installed using ultrasonic vibration + heat to melt the plastic slightly and insert the brass part, so it bonds in.

• Heat-set inserts: The insert is heated (e.g. with a soldering iron) and pressed into a pre-formed hole in the plastic. As the brass cools, the plastic solidifies around it, creating a strong joint.

• Pull-Out Strength: Designed to resist being extracted when screws are screwed in / out, thanks to knurling and groove design.

• Torque Resistance: Good resistance to torque — the knurling and close tolerances help prevent the insert from rotating in the plastic.

• Thermal Stability: Brass handles high temperatures well, making these inserts suitable for robust industrial applications.

• Corrosion Resistance: Brass naturally resists corrosion, and further coatings (nickel, tin, etc.) are commonly offered.

• Thread sizes can start very small (e.g. M2) and go up to larger sizes (depends on manufacturer) — custom sizes are often possible.

• Lengths / heights vary depending on design; manufacturers often offer custom lengths.

• There are datasheets available (for example, from JC Fasteners) which show detailed dimensions for different thread sizes + insert length.

• Insert finishes vary: Natural Brass, Nickel-plated, Tin-plated, and other custom coating options as per client requirement.

• These surface treatments help with corrosion resistance, aesthetics, and sometimes better bonding with the moulded material.

Sample Time:Available in 5-10 days for different items.

Drawing Format:CAD / PDF / DWG / IGS / STEP.

Packaging:Standard package, Carton box or Pallet, As per customized specifications

Shipping:DHL, FEDEX, UPS and By Sea or as per client’s requirements.