CNC Machined Metal Parts Wholesale

CNC Machined Metal Parts

-- Steady & Reliable Manufacturer --

Yuyao Hongli Optoelectronics Co., Ltd. is a premier source manufacturer of Precision CNC Machined Metal Parts, producing high-complexity components for automotive, aerospace, electronics, medical, and industrial automation equipment. Operating out of our 5,000-square-meter facility in Yuyao, Zhejiang, we utilize advanced 3-axis, 4-axis, and 5-axis CNC machining centers, Swiss-type CNC lathes, and precision surface grinders. We process stainless steel, aluminum, brass, copper, carbon steel, and titanium alloys into intricate parts holding micron-level tolerances down to 卤0.005mm. Partner with Yuyao Hongli for full DFM optimization, rapid prototyping, low-to-high volume production, and direct-factory pricing.

MANUFACTURING CAPABILITIES

Equipment and process capabilities

From mold design to batch stamping, we cover production needs of different tonnages and precision levels.

  • 01

    High-Precision 4/5-Axis CNC Milling

    Utilizing multi-axis CNC machining centers, we perform complex 3D contouring, pocketing, drilling, and tapping on multi-sided parts in a single setup, guaranteeing absolute geometric concentricity.

  • 02

    Swiss Precision CNC Turning & Lathe Turning

    Our Swiss-type automatic CNC lathes machine small, long, and high-density cylindrical shafts, pins, micro-screws, and threaded fittings with high repeatability.

  • 03

    High-Speed Threading & Precision Micro-Boring

    We execute high-precision thread cutting, internal/external groove machining, and micro-hole boring, achieving mirror-like surface finishes across high-hardness metals.

  • 04

    Secondary CNC Milling & Deburring

    Precision 4-axis secondary milling stations add keyways, chamfers, cross-holes, and intricate slot features to stamped, forged, or die-cast blanks.

SPEC · Overview of Key Equipment Parameters

Equipment TypeTonnage / SpecificationMachinable MaterialTypical Processing Thickness
5-Axis / 4-Axis CNC Machining Center12,000 - 20,000 RPM Spindle SpeedAluminum, SUS304/316, Brass, Alloy Steel0.5mm - 300mm Workpiece Size
Swiss-Type Precision CNC LatheDual-Spindle Live Tooling LatheBrass, Copper, Stainless, Titanium, Steel脴 0.5mm - 脴 32mm Bar Stock
Precision CNC Turning CenterHigh-Rigidity Heavy Turning LatheCarbon Steel, HSLA, Tool Steel, Aluminum脴 5.0mm - 脴 250mm Chuck Capacity
Surface & Cylindrical GrinderSub-Micron Precision Grinding UnitHardened Tool Steels & Stainless SteelFlatness & Circularity down to 0.002mm
QUALITY CONTROL

Full-process quality control system

From incoming material inspection to full outgoing inspection, key processes are equipped with inspection points to ensure batch consistency.

3D CMM & Sub-Micron Optical Inspection

Ensuring absolute geometric fidelity across high-complexity machined components.

  • 3D Coordinate Measuring Machine (CMM) checking spatial GD&T tolerances down to 卤0.005mm.
  • High-resolution 2D optical profile projectors for rapid lot sampling.
  • Concentricity and runout testing using precision electronic dial indicators.

Surface Roughness & Micro-Hardness Audit

Validating machined surface smoothness and material hardness across critical friction zones.

  • Surface roughness profilometer checking (Ra values down to 0.2 碌m).
  • Micro-Vickers and Rockwell C hardness testing post heat-treatment.
  • Thread pitch line and plug gauge 100% inspection for tapped features.

Material Grade Verification & Plating Audit

Confirming raw material chemical composition and surface coating durability.

  • XRF Spectrometer (PMI) analysis to verify alloy purity (Aluminum, Stainless, Copper).
  • XRF coating thickness measurement for anodized, electroplated, or passivated layers.
  • Neutral Salt Spray (NSS) testing per ASTM B117 for plated/passivated parts.
SURFACE FINISHING

Surface treatment process

Depending on the usage environment and appearance requirements of the parts, we offer anti-corrosion, wear-resistant, or decorative surface treatment solutions.

Finishing ProcessApplicable MaterialPrimary FunctionTypical Application
Anodizing (Type II / Type III Hardcoat)Aluminum 6061, 7075, 5052Increases corrosion resistance, surface wear hardness, and offers vibrant color optionsAutomotive brackets, drone frames, optical housings, heat sinks
Chemical Passivation300 & 400 Series Stainless SteelRemoves free surface iron contaminants and regenerates corrosion-resistant passive oxide filmMedical device implants, sensor housings, food machinery parts
Electroplating (Zinc, Nickel, Gold, Silver)Brass, Copper, Carbon Steel, Alloy SteelImproves electrical conductivity, prevents tarnish, and provides decorative appearanceElectrical contacts, RF connectors, hydraulic valve blocks
Electropolishing & Bead BlastingStainless Steel, Aluminum, TitaniumCreates a uniform satin or mirror-like surface while removing microscopic machining burrsSanitary fittings, luxury electronics trims, surgical handles
Note: The above is a standard process list. Specific film thickness, color, and salt spray resistance rating can be customized according to customer drawings.
APPLICATIONS

Main application areas

Our products are widely used in industries that require high structural strength and precision consistency.

Automotive & Electric Vehicle (EV) Systems

High-precision CNC machined metal components built for harsh automotive environments.

  • EV motor shafts, housing covers, and sensor mounts
  • Engine turbocharger impellers and fuel injection blocks
  • Brake caliper pistons and suspension control arms

Industrial Automation & Robotics

Durable machined components engineered for high mechanical load and repeated cycling.

  • Robotic arm joint housings, gears, and mounting flanges
  • Pneumatic cylinder caps, valve bodies, and manifolds
  • Linear guide blocks and precision motion leadscrews

Electronics, Telecom & Medical Devices

Miniaturized micro-machined parts designed for signal integrity and biocompatibility.

  • 5G telecom RF filter cavities and microwave connectors
  • Medical diagnostic probe housings and surgical tool bodies
  • High-end consumer electronics camera bezels and metal frames
PRODUCTION / FACTORY ADVANTAGES

Factory production advantages

With its own factory and equipment, the company ensures stable delivery times and controllable costs.

20+ Years of Precision Machining Expertise

Yuyao Hongli brings over two decades of technical mastery in multi-axis milling, Swiss turning, and hard-material machining.

Integrated Tool Shop & Surface Finishing

We combine CNC milling, turning, surface grinding, passivation, and anodizing under one roof in Yuyao, Zhejiang.

Strict CMM Quality Assurance & Low MOQs

Complete CMM inspection reports accompany every batch, supporting flexible order sizes from quick prototyping to high-volume output.

CUSTOM MANUFACTURING PROCESS

Customized production process

From receiving drawings to batch delivery, standardized processes ensure traceability at every stage.

  • 1. CAD/CAM Review & DFM Optimization

    Engineers analyze 3D CAD models, optimize machining paths, select cutting tools, and perform tolerance stack-up checks.

  • 2. Material Sourcing & CNC Setup

    Raw bar stock or plate metal undergoes PMI material testing, followed by fixture setup on 4/5-axis CNC machines.

  • 3. Trial Machining & First Article Inspection (FAI)

    Initial parts undergo full 3D CMM inspection, optical profile checks, and surface roughness measuring for customer sign-off.

  • 4. Mass Production & Automated Deburring

    Multi-axis CNC centers run high-speed production, followed by automated vibratory deburring or ultrasonic cleaning.

  • 5. Surface Finishing & Export Packaging

    Parts undergo anodizing, plating, or passivation, receive 100% optical inspection, and are packed in custom anti-scratch trays.

FAQ

Frequently Asked Questions

Here are some questions that clients often ask before cooperating with us.

What tolerances can Yuyao Hongli maintain on CNC machined parts?

Using high-rigidity CNC machining centers, Swiss lathes, and surface grinders, we routinely maintain tight tolerances down to 卤0.005mm.

What metals do you process for CNC machining?

We machine aluminum (6061, 7075, 5052), stainless steel (304, 316, 17-4PH), brass, copper, carbon steel, alloy steel, and titanium.

Can you handle low-volume prototypes as well as high-volume production?

Yes, we support flexible production runs ranging from 1-piece rapid prototype samples to hundreds of thousands of production units.

What is your typical lead time for custom CNC machined parts?

Prototype samples are delivered within 5 to 7 days, while full production orders typically take 15 to 25 days depending on complexity.

About Us
Yuyao Hongli Optoelectronics Co., Ltd.
Yuyao Hongli Optoelectronics Co., Ltd.
Yuyao Hongli Optoelectronics Co., Ltd. is a comprehensive enterprise with over 20 years of experience in the manufacturing industry. Located in the Yangming Science and Technology Industrial Park of Yuyao, Zhejiang Province, it enjoys convenient transportation and a solid industrial foundation. As a famous China CNC Machined Metal Parts Suppliers and CNC Machined Metal Parts Factory, founded in 2000, formerly known as Yuyao Hongli Optoelectronics Educational Instruments Co., Ltd., the company is wholly owned by a natural person, with Xie Gang as the legal representative. Its registered capital of 500,000 yuan has been fully paid up, and it has maintained its continued development through stable operations.
Relying on a 5,000-square-meter modern factory and multiple stamping workshops, the company has built a diversified product system. Its core businesses cover the manufacturing, processing and wholesale and retail of educational instruments, optical instruments, household electric heaters, small household appliances, auto parts, hardware and plastic products, etc. At the same time, it operates and acts as an agent for the import and export trade of goods and technologies, and its products are sold at home and abroad.
The company brings together industry management elites and senior engineers to form a mature R&D and management team. Adhering to the business philosophy of "integrity and pragmatism," it is committed to providing customers with high-quality products and comprehensive after-sales service. Leveraging its diversified portfolio, certification guarantees, and import/export advantages, the company actively expands cooperation both domestically and internationally, and is willing to establish long-term and stable trade partnerships with partners from all sectors, continuously striving forward in the wave of intelligent and high-end development in the manufacturing industry.
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