Brass Inserts – Brass Moulding Inserts – Precision Threaded Inserts for Plastic Moulding Applications
Brass Inserts Moulding Inserts
Brass Inserts, also known as Brass Moulding Inserts or Brass Threaded Inserts for Plastics, are precision components designed to provide durable metal threads in plastic parts. We are one of the leading manufacturers and exporters of Brass Inserts from India. We have been supplying Brass Moulding Inserts to the world market for many decades. These inserts are widely used in plastic injection moulding, compression moulding, and thermoplastic assemblies to create strong, wear-resistant threaded connections. Brass inserts are manufactured from high-grade Brass alloys and feature knurling, grooves, or undercuts that ensure strong bonding with plastic materials. Due to excellent corrosion resistance, machinability, and thermal conductivity, Brass inserts are preferred in automotive components, electronics housings, electrical switchgear, consumer appliances, and industrial equipment. With advanced CNC machining and precision turning facilities, we manufacture Brass moulding inserts in standard and custom sizes with typical turnaround time of 4–6 weeks.
Overview of Brass Inserts / Brass Moulding Inserts
Brass moulding inserts are internally threaded metal components embedded into plastic parts to provide durable threaded connections. Plastics alone cannot withstand repeated assembly or high torque, therefore Brass inserts are used to reinforce threaded joints. These inserts are either moulded directly during injection moulding or installed using heat-staking, ultrasonic insertion, or press-fit methods. Knurled surfaces, diamond patterns, and helical grooves improve retention strength by increasing surface contact with plastic materials. Brass inserts are widely used in thermoplastics such as ABS, Nylon, Polycarbonate, Bakelite, PVC, and other engineering polymers. Their corrosion resistance and electrical conductivity also make them ideal for electronic and electrical assemblies. The combination of mechanical strength and resistance to stripping ensures long-term performance even under repeated fastening cycles.
Types of Brass Moulding Inserts
Brass inserts are manufactured in several designs depending on installation method and plastic material type.
| Type | Description |
|---|---|
| Heat-Set Inserts | Installed by heating and pressing into plastic |
| Ultrasonic Inserts | Installed using ultrasonic vibration |
| Press-Fit Inserts | Installed by mechanical pressing |
| Mould-In Inserts | Inserted during injection moulding |
| Knurled Inserts | External knurling improves grip |
| Flanged Inserts | Provides extra surface support |
| Self-Tapping Inserts | Cuts threads during installation |
Material Grades & International Standards
Our Brass inserts are produced using globally accepted Brass alloys to meet international specifications.
| Standard | Grade | Description |
|---|---|---|
| ASTM | C36000 | Free Cutting Brass |
| ASTM | C37700 | Forging Brass |
| BS | CZ121 | Free Machining Brass |
| BS | CZ122 | DZR Brass |
| DIN | CuZn39Pb3 | German Standard |
| EN | CW614N | European Brass Alloy |
| IS | IS 319 Grade I | Indian Brass |
| JIS | C3604 | Japanese Standard |
| GB (China) | HPb59-1 | Chinese Equivalent |
These materials offer excellent machinability, corrosion resistance, and dimensional stability.
Manufacturing Process of Brass Inserts
Brass moulding inserts are produced through precision machining from Brass rods or bars. The manufacturing process begins with cutting raw Brass bars into suitable blanks, followed by CNC turning operations to produce the outer diameter, internal threads, and grooves. Knurling operations are performed using specialized knurling tools to create diamond, straight, or helical patterns. Thread tapping or thread rolling ensures accurate internal threads such as metric or UNC/UNF. After machining, inserts undergo deburring, ultrasonic cleaning, and quality inspection. Surface finishes such as natural Brass, Nickel plating, Tin plating, or passivation are applied depending on application requirements. Each production batch is inspected using thread gauges, optical comparators, and precision measuring instruments to maintain consistent tolerances.
Typical Size Chart for Brass Inserts
| Internal Thread | Outer Diameter (mm) | Length (mm) | Typical Application |
|---|---|---|---|
| M3 | 4.6 – 5.0 | 4 – 6 | Electronics housings |
| M4 | 6 – 7 | 5 – 8 | Electrical components |
| M5 | 7 – 8 | 6 – 10 | Plastic assemblies |
| M6 | 8 – 10 | 8 – 12 | Automotive parts |
| M8 | 10 – 12 | 10 – 16 | Heavy plastic components |
(Custom sizes and threads available as per drawings.)
Physical & Mechanical Properties of Brass Inserts
| Property | Typical Value |
|---|---|
| Density | 8.4 – 8.7 g/cm³ |
| Tensile Strength | 300 – 500 MPa |
| Hardness | 80 – 150 HB |
| Melting Range | 900 – 940°C |
| Electrical Conductivity | High |
These properties provide excellent strength, corrosion resistance, and machinability.
Machinery Used in Production
Production of Brass moulding inserts involves advanced equipment such as CNC automatic lathes, multi-spindle turning machines, tapping machines, thread rolling machines, knurling tools, polishing machines, and optical inspection instruments. These machines ensure precise dimensions and high production efficiency.
Industries Using Brass Moulding Inserts
Brass inserts are widely used in the automotive industry, electrical switchgear manufacturing, plastic injection moulding industries, electronics housings, telecom equipment, medical devices, consumer appliances, and industrial machinery. Their ability to provide durable threads in plastic components makes them essential in many modern product designs.
Performance Metrics
Brass inserts provide excellent pull-out resistance and torque strength in plastic assemblies. The knurled surfaces ensure strong mechanical bonding, while precision threads maintain reliable fastening performance. Typical dimensional tolerances are maintained within ±0.02 mm to ±0.05 mm, depending on part design and manufacturing process.
Why Choose Our Brass Inserts
With more than 30 years of manufacturing and export experience, we supply high-quality Brass moulding inserts to global OEMs and distributors. Our strengths include custom design capabilities, consistent quality control, flexible production schedules, and strong communication with international clients. We offer customized packaging with customer logos, barcode labeling, and private branding options. Our engineering team also supports product development and prototyping for new applications.
Frequently Asked Questions (Q&A)
Q1: What are Brass moulding inserts used for?
They provide durable metal threads in plastic components.
Q2: What installation methods are available?
Heat-staking, ultrasonic insertion, mould-in, and press-fit.
Q3: Are custom inserts possible?
Yes, we manufacture inserts as per drawings and specifications.
Q4: What is the typical delivery time?
Production turnaround is usually 4–6 weeks.
Q5: Do you supply metric and UNC threads?
Yes, both standards are available.
Q6: Are surface coatings available?
Nickel plating, Tin plating, and natural Brass finish.
Q7: What plastics are compatible with inserts?
ABS, Nylon, PVC, Bakelite, Polycarbonate, and other engineering plastics.
Q8: What tolerances can be maintained?
Typically ±0.02 mm to ±0.05 mm depending on design.
Q9: Do you export globally?
Yes, to USA, Europe, Middle East, and Asia.
Q10: Can inserts be supplied with custom knurl patterns?
Yes, straight, diamond, and helical knurling patterns are available.
Glossary of Terms
Knurling: Surface pattern used to improve grip and retention in plastics.
Heat-Set Insert: Insert installed using heat to soften plastic material.
Ultrasonic Insertion: Installation using ultrasonic vibration energy.
Press-Fit Insert: Insert installed by mechanical pressing force.
Injection Moulding: Plastic manufacturing process using molten polymer.
Related Terms
Brass moulding inserts manufacturer India, Brass threaded inserts for plastics, knurled Brass inserts supplier, heat-set Brass inserts exporter, plastic injection moulding inserts, Brass ultrasonic inserts, precision Brass threaded inserts.
Get a Quote for Brass Inserts – Brass Moulding Inserts
📧 Email: sales@cableglandsindia.com
📞 Phone: +91-22-43449300 | +91-22-43449323