- Ellyn@tenghui-proto.com
- +86-18666887162
Get custom high-precision metal and plastic components directly from our in-house CNC manufacturing facility, covering rapid prototyping to full-scale mass production with zero middleman markup.
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TENGHUI provides custom CNC machining services for metal and plastic parts, from rapid prototyping and low-volume runs to full-scale production. With 50+ CNC machines and comprehensive capabilities in CNC milling, turning, EDM, drilling, and precision grinding, we produce both simple and complex parts according to your drawings and specifications. Based in China, we serve customers worldwide with consistent quality, reliable lead times, and dependable delivery.
TENGHUI machines a complete portfolio of certified metals and engineering plastics for milling, turning, and multi-axis production with full material mill certificates and strict quality traceability.
Lightweight, highly machinable, corrosion-resistant, and cost-effective. Available in structural, high-strength aerospace, and anodizing-friendly grades for both milled housings and precision turned shafts.
Electronic enclosures, brackets, heat sinks, aerospace structural frames, bushings, shafts, front panels, and custom robotic components.
Type II color anodizing, Type III hard anodizing, chromate conversion (alodine), bead blasting, powder coating, and laser engraving.
Aluminum 6061 / 7075 Precision Parts
Lightweight, impact-resistant, cost-effective, and easy to machine to tight tolerances. Offers excellent electrical insulation and is ideal for early-stage functional prototyping and consumer enclosures.
Electronic chassis, equipment bezels, sensor housings, handheld device prototypes, automotive dashboard components, and test fixtures.
As-machined, smooth sanding, high-gloss mechanical polishing, custom PU spray painting, silk-screening, and laser engraving.
ABS Rigid Engineering Plastic
Improve the performance, durability, corrosion resistance, and appearance of your custom CNC-machined parts with our comprehensive surface finishing options. We offer anodizing, plating, powder coating, polishing, bead blasting, laser marking, and other treatments tailored to your material, application, and engineering specifications.
| Surface Finish | Appearance / Color | Key Properties & Benefits | Compatible Materials |
|---|---|---|---|
| As-Machined | Natural finish with visible tool marks | The most economical option with no additional finishing. Typical surface roughness is approximately Ra 1.6–3.2 μm, depending on the material, geometry, and machining process. | Aluminum, steel, stainless steel, copper, brass, titanium, and plastics |
| Anodizing (Type II) | Clear, black, blue, red, gold, grey, and other colors | Creates a protective oxide layer that improves corrosion resistance, wear resistance, and appearance. Color and finish may vary by alloy and surface condition. | Aluminum |
| Hardcoat Anodizing (Type III) | Natural grey, dark grey, black, and selected colors | Produces a thicker and harder oxide layer for improved surface hardness, abrasion resistance, electrical insulation, and durability. Coating thickness depends on the specification and application. | Aluminum |
| DLC Coating | Dark grey to black | Provides high surface hardness, low friction, and improved wear resistance while adding minimal coating thickness. | Tool steel, stainless steel, titanium, carbide, and selected alloys |
| Titanium Nitride (TiN) | Metallic gold | A PVD coating that improves surface hardness, wear resistance, and lubricity, helping extend the service life of tools and mechanical components. | Tool steel, stainless steel, carbide, titanium, and selected alloys |
| Metal Plating | Nickel, chrome, zinc, tin, silver, gold, and other metallic finishes | Improves corrosion resistance, wear resistance, conductivity, solderability, or appearance, depending on the plating material and process. | Steel, stainless steel, copper, brass, and properly pretreated aluminum |
| Chemical Conversion Coating | Clear or yellow/gold iridescent | Provides corrosion protection while helping retain surface conductivity. It can also serve as a suitable base for painting or powder coating. | Aluminum |
| PTFE-Based Coating | Black, grey, green, or other formulation-dependent colors | Provides low friction, non-stick performance, chemical resistance, and improved wear characteristics. Performance depends on the coating system and operating conditions. | Aluminum, steel, stainless steel, and selected alloys |
| Case Hardening | Minimal change or heat-treatment discoloration | Hardens the surface while retaining a tougher core, improving wear resistance and fatigue performance. Available processes depend on the steel grade and part requirements. | Selected carbon steels, alloy steels, and tool steels |
| Heat Treatment | Appearance varies by process | Modifies mechanical properties such as hardness, strength, toughness, and dimensional stability. Results depend on the material and specified heat-treatment cycle. | Carbon steel, alloy steel, tool steel, stainless steel, and selected aluminum alloys |
| Passivation | Minimal change to the original appearance | Removes free iron and surface contaminants, helping restore or improve the corrosion resistance of stainless steel. | Stainless steel |
| Powder Coating | Matte, satin, gloss, textured, and custom colors | Provides a durable decorative and protective coating with good resistance to corrosion, abrasion, scratching, and chipping. | Aluminum, steel, stainless steel, and other suitable heat-resistant metals |
| Industrial Painting | Matte, satin, gloss, and custom colors | Provides decorative color and additional environmental or corrosion protection. Performance depends on surface preparation, primer, paint system, and operating conditions. | Metals and selected plastics |
| Bead Blasting | Uniform matte or satin texture | Removes minor machining marks and creates a consistent, non-reflective surface. It is commonly used before anodizing or other finishing processes. | Aluminum, stainless steel, titanium, brass, and selected plastics |
| Polishing | Smooth, bright, or mirror-like finish | Reduces surface roughness and improves appearance, cleanability, and, in some applications, corrosion resistance. | Aluminum, stainless steel, brass, copper, titanium, and selected plastics |
| Brushing | Directional satin finish | Creates a uniform linear texture that improves appearance and helps conceal minor surface marks. | Aluminum, stainless steel, brass, and copper |
| Black Oxide | Matte or satin black | Produces a thin conversion layer that improves appearance and provides mild corrosion resistance when combined with oil or sealant. | Carbon steel, alloy steel, tool steel, and selected stainless steels |
| Zinc Plating | Clear, blue, yellow, black, or olive drab | Provides economical sacrificial corrosion protection for steel components. Additional chromate conversion coatings can improve corrosion resistance. | Carbon steel and alloy steel |
| Electropolishing | Smooth, bright, and clean metallic finish | Removes a controlled amount of surface material to improve smoothness, cleanability, corrosion resistance, and edge quality. | Stainless steel and selected conductive metals |
| Laser Marking | Permanent text, logos, serial numbers, or codes | Creates durable identification and traceability marks with minimal effect on part dimensions. Marking appearance depends on the material and finish. | Most metals and selected plastics |
CNC machining is a subtractive manufacturing process that uses computer-controlled cutting tools to remove material from solid blocks, bars, plates, or tubes. It produces custom metal and plastic parts with tight tolerances and fine surface finishes strictly according to 3D CAD models and 2D technical drawings.
TENGHUI provides a full spectrum of precision machining processes, including CNC Milling, CNC Turning, 5-Axis CNC Machining, EDM Services, deep drilling, and Precision Grinding. Our fleet of 50+ CNC machines supports rapid prototypes, pilot batches, and repeat high-volume production.
We machine certified aerospace and commercial grade metals and plastics:
Metals & Alloys: Aluminum (6061, 7075, etc.), Stainless Steel (304, 316L, 17-4PH), Carbon & Alloy Steel (4140, 1045), Tool Steel (D2, H13, P20), Titanium (Grade 5, Grade 2), and Copper & Brass (C110, C360).
Engineering Plastics: ABS, POM (Delrin), PA (Nylon), PEEK, PP, HDPE, PC (Polycarbonate), and PMMA (Acrylic). Other specialized raw materials are available upon request.
Please provide your 3D CAD files (STEP, STP, or IGES preferred) and fully dimensioned 2D drawings (PDF format). Be sure to specify the material grade, order quantities, surface finishes, critical tolerances, and any inspection or certification requirements.
Yes. Our engineering team conducts a thorough DFM review on every project, evaluating part geometry, critical tolerances, tool accessibility, raw stock availability, surface finishes, and potential machining risks. We provide practical engineering suggestions to optimize machinability, shorten cycle times, and lower unit costs.
Our standard machining tolerance is typically ±0.05 mm. Precision tolerances down to ±0.01 mm can be consistently achieved for selected critical features after engineering review, depending on material stability, geometry, overall size, and inspection method.
Machining costs can be substantially reduced by:
We support one-off functional prototypes, pilot runs, and high-volume contract production. For suitable components, our 50+ machine fleet, automatic bar feeders, and multi-part workholding systems can comfortably support monthly production volumes exceeding 5,000 pieces.
Lead times typically range from 3 to 7 business days for rapid prototypes, and 2 to 4 weeks for volume production, depending on part complexity, total order quantity, raw material availability, post-finishing processes, and CMM inspection requirements. A guaranteed schedule is confirmed with each quotation.
Through our comprehensive Surface Finishing Services, we provide Type II color anodizing, Type III hardcoat anodizing, electroplating, chemical passivation, powder coating, PU painting, bead blasting, mirror polishing, brushing, heat treatment, and precision laser marking tailored to your material and operating environment.
We execute multi-tier quality control across four stages: Incoming Raw Material Verification, First-Article Inspection (FAI), In-Process Real-Time Checks, and Final Metrology Inspection. Our facility is equipped with micrometers, thread gauges, height gauges, optical projectors, surface roughness testers, and calibrated Coordinate Measuring Machines (CMMs).
Yes. Raw material mill certificates, dimensional inspection reports, full CMM reports, and surface-treatment certificates can be provided upon request. Please specify all compliance and documentation requirements prior to order placement so they are documented in the manufacturing plan.
If you have any questions or would like to book a session please contact us.
Once we receive your design files, our senior manufacturing engineers will manually perform a comprehensive DFM review and deliver an accurate, optimized quote within 24 hours.
