Brass Knurled Inserts
Heat Staking / Ultrasonic Welding Inserts
Precision-machined brass inserts for embedding into plastic components. High-grade brass with diamond or straight knurled outer surfaces ensures a mechanical lock against rotation and pull‑out under load.
Installation demonstration: Ultrasonic & heat staking
Key Specifications
| Product Name | Brass Knurled Inserts, Heat Staking Inserts, Ultrasonic Inserts, Injection Molded Inserts |
| Material | C36000 / H59 Brass (Free-Cutting, Corrosion-Resistant) |
| Thread Sizes (Metric) | M1, M1.2, M1.4, M1.6, M1.7, M2, M2.5, M3, M4, M5, M6, M8, M10 |
| Length Range | 1.5mm – 15mm (over 20 options) |
| Outer Diameter Range | 2mm – 12mm (wide OD selection) |
| Installation Methods | Heat staking, ultrasonic welding, injection molding, press fit |
| Surface Finish | Plain brass, optional plating (nickel, tin, gold) |
| Knurl Pattern | Straight knurl, diamond knurl, double helical knurl (customizable) |
| Packaging / MOQ | Bulk, anti-static bags, custom tray; MOQ 100 pieces |
| Lead Time | 3-7 days for standard sizes; 7-15 days for bulk/custom orders |
| OEM/ODM | Custom thread sizes, lengths, knurl patterns, and plating available |
Product Advantages
🔩 Superior Pull-Out & Torque Resistance
Precision-machined knurled outer surface creates a strong mechanical interlock with plastic substrate, preventing rotation and pull-out even under repeated assembly/disassembly cycles.
🛡️ Corrosion-Resistant Brass Construction
High-quality brass offers excellent corrosion resistance, making inserts suitable for humid or outdoor environments without rusting or degrading.
⚙️ Multiple Installation Compatibility
Designed for heat staking, ultrasonic welding, injection molding, or press fit processes — flexibility for different manufacturing workflows.
📏 Wide Size Range
Available in over 240 combinations of thread size, length, and outer diameter, covering consumer electronics, automotive, and industrial products.
✔ Cost-Effective & Repeatable — Eliminates tapping threads directly into plastic, reducing assembly time and improving reliability in mass production.
Extensive Size & Knurl Variations
Our brass knurled inserts are available in metric thread sizes from M1 to M10, with diameters and lengths matching virtually every plastic component requirement. The image illustrates the diversity of knurl patterns — straight knurl, diamond knurl, and custom double helical — all designed to maximize torsional resistance. Whether you need tiny M1 inserts for delicate electronics or robust M10 for automotive enclosures, DISLAB Precision delivers consistent dimensions and flawless surface finish. Every batch meets strict tolerance control, ensuring a seamless installation with ultrasonic or heat staking equipment.
In addition to standard inventory, we support OEM/ODM projects: custom outer diameters, non-standard lengths, or special plating (nickel/tin/gold) for enhanced conductivity or extreme corrosion protection. The photo on the right shows a selection of our most popular brass inserts, highlighting the knurling precision and uniform threading. Our engineering team collaborates closely to recommend the optimal insert geometry for your plastic resin (ABS, PC, Nylon, etc.), achieving maximum pull-out values and eliminating joint failure.
Common Applications & Problem-Solving
📱 Consumer Electronics Assembly
Smartphones, laptops, and home appliances. Eliminates stripped threads and loose fasteners caused by repeated disassembly, ensuring structural soundness through repairs and upgrades.
🚗 Automotive Interior & Exterior Parts
Plastic trim, dashboard components, lighting fixtures. Vibration-resistant threaded connections that won’t loosen over time under road vibration and temperature changes.
🏭 Industrial Equipment Enclosures
Plastic enclosures for machinery, control panels. Creates strong, durable threads in thin plastic walls, securing heavy components without cracking the enclosure.
🖨️ 3D Printed & Custom Plastic Parts
Adds robust threaded connections to 3D printed prototypes. Overcomes low strength and poor wear resistance of printed threads, providing metal inserts that withstand repeated use.
Real Customer Case – High-Volume Order
🇺🇸 US-Based Consumer Electronics Manufacturer – 500,000 pieces of M2 & M3 Brass Knurled Inserts
A leading US electronics brand placed a bulk order for wireless earbud charging cases. The inserts needed strong, vibration-resistant threaded connections for the hinge and cover components. DISLAB Precision verified material composition, dimensional accuracy, and knurl consistency. Each batch inspected for surface finish and thread quality, packed in anti-static bags. The customer reported smooth ultrasonic installation, tight fit, and zero production downtime. Repeat orders for additional sizes followed, citing excellent performance and responsive support.
✓ Achieved pull-out strength targets ✓ 100% fit in automated assembly ✓ 3-7 day lead time
Frequently Asked Questions
🔗 Explore more precision fasteners from DISLAB Precision:
At DISLAB Precision, we are your trusted global supplier of industrial parts and accessories, including fasteners, spacers, standoffs, and custom hardware solutions. Backed by a network of 300+ qualified partner facilities, we deliver over 50 million pieces monthly, supporting both small samples and large-volume bulk projects. Every product undergoes strict quality checks for material grade, dimensional accuracy, and surface finish. With 40+ engineering experts, we ensure consistent quality, reliable lead times, and flexible OEM/ODM services. High quality | Global shipping | Custom drawing support
Direct Contact Channels
- One-stop service: design, customization, production, and global delivery
- OEM/ODM solutions for industrial and export-oriented buyers
