I. Product Overview

This rolled thread pre-buried brass metal sleeve is made of H62 brass bar material through CNC precision turning and forming. The middle section of the cylinder is processed with straight thread rolled texture, and the ends are smooth guide cylindrical. The product is placed inside the mold as an injection molding pre-buried insert. After plastic injection molding, the rolled thread texture tightly engages with the plastic, preventing the brass sleeve from rotating circumferentially or detaching axially; the hollow through-hole can be used for screw fastening and shaft positioning, and the brass material also meets the electrical conductivity requirements.

Supports brass, stainless steel and various other materials. Inner and outer diameters, total length, and knurling position and width can all be customized according to customer's drawings or physical samples. Both small batch trials and long-term bulk supply orders are acceptable, with each knurling size and inner/outer hole diameter inspected upon delivery.

Section Two: Core Highlights of Craftsmanship and Workmanship

1. Copper alloy rod CNC integrated molding, high dimensional consistency
   The cylinder and knurling texture are machined in one operation, eliminating the need for secondary assembly. The batch products have stable outer diameter and length tolerances, suitable for automated mold injection production.
2. Central straight rib embossed structure, injection molding firm clamping
   Evenly grooved embossed design increases the contact area and friction with plastic, making it less likely to slip or come off after injection molding, enhancing the product's long-term stability.
3. Smooth guiding sections at both ends for easy mold material placement
   The ends of the cylinder are smooth, unknurled cylindrical surfaces, facilitating the insertion into the mold cavity by hand or robotic arm, reducing scratching of the mold and mold jamming.
4. Inner wall through-hole precision turned and burr-free, assembly smooth
   Inner hole edge is fullyPassivation treated, screw and shaft assembly is smooth without sharp burrs to scratch mating parts.

Section 3: Optional Customizable Raw Materials

1. H62 Brass (Recommended)
   Easy to machine, good rolling thread forming effect, balanced electrical conductivity, high cost-performance ratio, the first choice for injection molding pre-buried copper sleeve.
2. Cupronickel
   Excellent conductive performance, pre-embedded use of plastic shells for connectors with high current capacity.
3. 304 Stainless Steel
   Corrosion-resistant, suitable for damp environments; pre-buried sleeves not requiring high electrical conductivity.
4. Phosphor Bronze
   Higher toughness, better resistance to frequent force conditions, superior anti-slip and anti-torque performance.

4. Optional Surface Treatment Processes

• Brass Original Color: General injection molding pre-burial scheme, stable adhesion
• Nickel Plating: Prevents copper from oxidizing and turning black, suitable for exposed or precision electronic components.
• Tin-plated: Improves bonding with plastic and solder, facilitating welding and assembly.
• Gold Plating: Ultra-low Impedance, High-end Precision Connector Conductive Insert

Chapter 5: Applicable Application Scenarios

✅ Various plastic shell injection-molded embedded anti-slip copper inserts
Connector plastic housing conductive pre-buried metal sleeve
✅ Consumer electronics, small household appliances plastic component locating bushes
✅ Built-in support in sensor plastic shell, conductive copper sleeve
✅ Medical device, instrument plastic structure pre-buried fasteners

6. Core Product Advantages

1. Numerical control precision machining, free adjustment of knurl width, cylinder length and diameter size.
2. Straight-rib embossed anti-slip and anti-pulling design, solving the pain point of copper sleeve turning off after injection molding
3. One-piece molding structure, high-temperature resistant, compatible with standard plastic injection temperatures
4. A variety of electroplating materials available, balancing structural positioning and electrical conductivity requirements.
5. Supports small batch trials, stable production capacity for large quantities, suitable for long-term supply to injection molding factories

Chapter 7: Common Procurement Q&A

Q1: Can it be made with a wavy embossed pattern and fully embossed ends?
A: Support available for straight, honeycomb, full-length embossed, and partial embossed designs, all customizable as required.
Q2: In high-temperature injection molding environments, will brass deform?
A: Copper sizes are stable under normal plastic injection temperatures; special high-temperature materials can optimize wall thickness structure.
Q3: Can the inner hole be machined with an internal thread?
A: Support, both through-hole and internal threaded copper sleeve can be integrated processed.
Q4: Can we provide injection molding drawing tolerance plans that are compatible with the customer's mold?
A: Yes, the outer diameter tolerance of the copper sleeve can be adjusted according to the plastic shrinkage rate.