Threaded Inserts for Plastic Metal Stainless Steel Brass Threaded Inserts M3 M6 M8

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What Are Threaded Inserts for Plastic?

Threaded inserts for plastic are precision-engineered threaded reinforcement components specifically designed to create durable, high-strength threads in plastic materials. They compensate for plastic’s inherent low shear strength and prevent thread stripping, enabling reliable fastening in applications requiring repeated assembly/disassembly.

Threaded Inserts for Plastic: Specifications

1. Material

• Brass (CZ121/C36000): Excellent machinability and corrosion resistance

• Stainless Steel (303/316): Superior strength for high-load applications

• Nylon/POM: Lightweight, non-conductive alternative

• Aluminum: Ideal for weight-sensitive applications

2. Surface Treatment

• Zinc-Nickel Plating: Maximum corrosion protection

• PTFE Coating: Low-friction installation and operation

• Passivation (Stainless Steel): Enhanced rust resistance

• Anodized (Aluminum): Improved surface hardness

3. Common Specifications

• Thread Sizes: M2-M12 (metric), #4-1/2″ (UNC/UNF)

• Installation Methods: Ultrasonic, thermal, press-fit, or self-tapping

• Special Features: Knurled/helical exterior for improved retention

• Standards: DIN 796/797, ISO 9001, RoHS compliant

4. Applications

• Medical Devices: Sterilizable equipment housings

• Automotive: Plastic engine components and interior trim

• Consumer Electronics: Durable threads in device casings

• Industrial Equipment: Vibration-resistant plastic assemblies

Excellent Case: Automotive Fuel System Component

Challenge:
A Tier 1 automotive supplier experienced thread failure in nylon fuel line connectors after just 30 assembly cycles, causing leaks and recall risks.

Solution:

• Installed brass threaded inserts (M6, zinc-nickel plated) using thermal insertion:

  • Vibration Resistance: Withstood engine compartment vibrations up to 15G

  • Chemical Compatibility: Resisted fuel and oil exposure

  • Temperature Stability: Performed from -40°C to +125°C

Results:

• Achieved 500+ assembly cycles with no degradation

• Eliminated warranty claims related to thread failure

• Reduced assembly torque requirements by 25%

Key Advantages

✔ 10X Thread Life vs. direct threading in plastic
✔ Chemical Resistant options for harsh environments
✔ Weight Savings vs. metal-to-metal fastening