Introduction
Heat-set brass inserts are designed to provide strong and durable threaded connections in plastic components. By embedding metal inserts into thermoplastics, manufacturers can achieve high pull-out resistance, torque strength, and long-term reliability.
Material Options
| Material | Characteristics | Applications |
|---|---|---|
| C3604 Brass | Excellent machinability, stable performance | General-purpose plastic assemblies |
| C6801 Brass (Low-Lead) | Eco-friendly, RoHS compliant | Consumer electronics, sustainable products |
| 12L14 / 1215 Steel | High hardness, free-cutting | Load-bearing parts requiring extra strength |
| A6061 Aluminum | Lightweight, moderate strength | Automotive and aerospace applications |
| SUS303 / SUS304 Stainless Steel | High corrosion resistance | Medical devices, outdoor equipment |
Dimensional Specifications
| Thread Size | Insert O.D. (mm) | Plastic Hole Ø (mm) | Insert Length Range (mm) |
|---|---|---|---|
| M1.6 | 2.5 | 2.0 | 2–4 |
| M2.0 | 3.6 | 3.0 | 2–5 |
| M2.5 | 4.2 | 3.6 | 2.5–4 |
| M3.0 | 4.6 – 5.0 | 4.0 – 4.4 | 2–8 |
| M4.0 | 6.0 – 6.3 | 5.3 | 4–8 |
| M5.0 | 6.7 – 7.0 | 5.5 | 5–8 |
| M6.0 | 8.7 – 9.2 | 6.0 – 11.0 | 6–11 |
| M8.0 | 10.0 | 8.0 | 10 |
Available in metric (M1.6–M8) and inch series (UNC/UNF) with custom lengths up to 200 mm.
Performance Data (Torque Resistance Reference)
| Thread Size | Insert O.D. (mm) | Length (mm) | Torque Resistance (kgf) |
|---|---|---|---|
| M1.6 | 2.5 | 3 | 3 kgf |
| M2.5 | 4.2 | 3–4 | 5 kgf |
| M3.0 | 4.6 | 5–6 | 8–10 kgf |
| M4.0 | 6.0 | 6–8 | 12–14 kgf |
| M5.0 | 6.7 – 7.0 | 5–8 | 10–12 kgf |
| M6.0 | 8.7 – 9.2 | 6–11 | 12–14 kgf |
| M8.0 | 10.0 | 10 | 16 kgf |
Conclusion
Heat-set brass inserts are a proven solution for reinforcing threaded joints in plastic assemblies. With a wide material selection, flexible size range, and strong mechanical performance, they meet the demanding requirements of modern industries.
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Author: CNC Machining & Manufacturing Specialist｜RunGu Enterprise Expert Team
Focused on CNC automatic lathes and mill-turn machining with nearly 30 years of hands-on experience.
About RunGu Enterprise Co., Ltd.
RunGu Enterprise Co., Ltd., based in New Taipei City, Taiwan, is a precision CNC machining manufacturer with nearly 30 years of experience. We provide one-stop customized solutions, including standoffs, RF coaxial connectors, pogo pins, shielding boxes, liquid cooling couplers, and other CNC metal components. Our products are widely used in electronics, telecommunications, medical devices, automotive, and industrial automation industries.
🌐 Learn more: About Rungu
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