Overview
Our Custom Precision Deep-Drawing Hollow Brass and Copper Bushing Sleeves are engineered for demanding automotive connection points where tight tolerances, long wear life, and excellent electrical/thermal conductivity are required. Manufactured by combining high-precision deep drawing with secondary CNC turning, coining and finishing operations, these sleeves deliver consistent inner/outer geometry, excellent concentricity, and controlled surface finishes for reliable fitment in housings, connectors, pivot points, and EMI/grounding interfaces. Ideal for engine, transmission, steering, sensor mounts, and battery connector assemblies, our bushings are offered as full OEM solutions from prototyping to high-volume production.
Characteristics
| Attribute | Details |
|---|---|
| Place of Origin | Xiamen, China |
| Brand Name | OEM / Private Label |
| Material | C26800 / C36000 Brass, C11000 / C12200 Copper or custom copper alloys |
| Part Type | Deep-drawn hollow bushing / sleeve (single or multi-step geometry) |
| Typical Sizes | ID: 2–60 mm; OD: 4–80 mm (custom sizes available) |
| Wall Thickness | 0.2–5.0 mm (application dependent) |
| Tolerance | Standard ±0.005 mm (custom tolerance available) |
| Process | Precision deep drawing → secondary CNC turning / reaming / broaching → heat treatment → surface finishing |
| Surface Finish | Ra 0.4–1.6 µm (custom finish options) |
| Hardness | Process-dependent; post-forming temper control and optional surface hardening available |
| MOQ | Flexible — prototypes and small pilot runs supported |
| Sample Lead Time | 5–10 days (samples) |
| Production Lead Time | 15–35 days (tooling dependent) |
| Certification | ISO 9001, IATF 16949 (available on request) |
| Application | Automotive connectors, grounding sleeves, pivot bearings, sensor housings, battery terminals |
Surface Treatment & Coating Options
- Tin Plating — Improves solderability and oxidation resistance for electrical contact surfaces.
- Nickel Plating — Enhances wear and corrosion resistance while providing a bright, robust finish.
- Silver Plating — Lowers contact resistance for high-performance electrical interfaces.
- Passivation / Chemical Brightening — For improved corrosion resistance and clean appearance on copper/brass.
- Phosphating — Prepares surface for secondary coatings or improves friction control for press-fit applications.
- PTFE / Dry Film Lubricant Coatings — Reduce friction and break-loose torque in sliding/pivot applications.
- Selective Plating — Cost-efficient plating applied only to contact areas as required by design.
Key Benefits
- High Dimensional Accuracy: Deep-drawing combined with precision CNC secondary operations maintains tight ID/OD concentricity and roundness for reliable press fits and bearings.
- Excellent Conductivity: Copper and brass alloys provide superior electrical and thermal conductivity where grounding or current transfer is required.
- Repeatable Production: In-house tooling and progressive deep-drawing lines ensure stable, high-volume output with low per-part variance.
- Optimized Wall Control: Controlled wall thickness and multi-step drawing capability enable thin-walled sleeves with high structural integrity.
- Customizable Finishes & Platings: Multiple surface finishes and selective platings available to meet electrical, mechanical, and environmental requirements.
Quality Assurance
Our QA system is built around automotive-grade inspection and traceability. Incoming raw materials are verified by spectrometry and material certificates. Each production lot undergoes: dimensional validation with CMM and optical comparators; concentricity/roundness testing; surface roughness measurement; coating thickness verification by XRF; contact resistance checks where applicable; and mechanical testing for spring/press-fit performance. We perform salt spray and cyclic fatigue testing for assemblies requiring enhanced durability. Full FAI (First Article Inspection) reports and traceable batch documentation are provided for OEM projects.
Factory Capabilities
Our facility integrates precision deep-drawing presses and progressive tooling with full secondary machining capacity: multi-axis CNC lathes, micro-reaming, broaching, and coining stations. Tooling is produced in-house using CNC machining and wire EDM to achieve micro-accurate dies and mandrels for high-repeatability drawing. Surface finishing and plating lines (automatic rack and barrel electroplating) deliver gold/silver/tin/nickel finishes with controlled thickness. Inspection equipment includes ZEISS CMM, optical comparators, profilometers, XRF coating analyzers, and micro-ohmmeters. We operate under ISO 9001 and IATF 16949 workflows and support customer audits, PPAP documentation, and vendor quality agreements.
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