CNC Precision Machining Service

Our CNC Machining Capabilities Overview

Multi-process precision CNC Machining manufacturing services — from prototyping to mass production.

Keywin offers comprehensive CNC precision machining services for custom metal and plastic parts. Our capabilities include CNC milling, CNC turning, 5-axis machining, precision grinding, wire EDM and CNC drilling, allowing us to select or combine suitable processes according to each part’s geometry, material, tolerance and functional requirements.

From one-off prototypes and engineering samples to small-batch and mass production, we provide a coordinated manufacturing solution that can also include surface finishing, dimensional inspection and component assembly.

CNC Milling

Precision machining of flat surfaces, slots, bevels, and complex curved profiles.

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CNC Turning

Rapid machining of rotational components with excellent concentricity and surface finish.

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5-axis Machining

Multi-angle cutting for efficient multi-face machining of complex parts in a single setup.

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CNC Grinding

Surface, internal, and external cylindrical grinding for superior surface roughness.

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Wire EDM

Machining of deep cavities, narrow slots, and complex contours where conventional cutting cannot reach.

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CNC Drilling

Precise hole drilling and tapping for multi-hole components in batch production.

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Cooperation & Machining Process

Requirement Review

Confirm design files, material specifications, and quantity requirements; conduct initial process assessment.

Process Planning

Develop machining routes and strategies; provide lead time and cost quotation.

Programming & Setup

Complete CNC programming; configure tooling, fixtures, and machine parameters.

Precision Machining

Execute cutting on advanced CNC equipment to achieve target geometry and strict tolerances.

Surface Finishing

Apply post-processing as required: anodizing, electroplating, sandblasting, polishing, and more.

Inspection & Delivery

CMM precision inspection to verify accuracy and consistency; on-time delivery.

CNC Precision Machining Service Capabilities

Machining Accuracy:

Standard: ±0.01 mm

Custom: ±0.005 mm
Maximum Machining Dimensions:

Up to 1,500 mm
Minimum Feature Size:

0.5 mm
Typical Lead Time:

10–30 days
Pricing:

Transparent quotation based on material, part complexity, quantity, and surface finish requirements
Machinable Materials:

Supports a wide range of metals and engineering plastics

CNC Milling Factory

Established	2000
Number of Machines	70+
Location	Zhongshan

CNC Turning Factory

Established	2000
Number of Machines	30+
Location	Zhongshan

Die Casting Factory

Established	2010
Number of Machines	10+
Location	Zhongshan

Injection Molding Factory

Established	2008
Number of Machines	20+
Location	Zhongshan

Forging Factory

Established	2014
Number of Machines	10+
Location	Zhongshan

Tolerance & Quality Control

We have established a comprehensive quality management system, with an experienced team ensuring product precision and consistency throughout the entire process.

Our quality procedures include: Incoming Material Inspection → First Article Inspection (FAI) → In-Process Sampling → Outgoing Quality Control (OQC). Each step adheres to strict standards, guaranteeing stable processes and consistent dimensions.

Equipped with CMMs, optical projectors, calipers, and hardness testers, we provide CMM reports, dimensional reports, and full inspection records, maintaining tolerances within ±0.005–0.01 mm.

We support customized acceptance criteria and inspection plans tailored to client requirements, ensuring full traceability and reliable quality assurance from design to delivery.

When designing custom CNC parts, buyers should clearly identify:

Critical dimensions and GD&T requirements
Hole diameter, depth and positional tolerance
Surface roughness requirements
Thread standards and inspection methods
Flatness, parallelism and perpendicularity requirements
Cosmetic and non-cosmetic surfaces
Post-machining heat treatment or surface finishing
Assembly, fit and functional testing requirements

Our engineers review these requirements before programming and may suggest changes to wall thickness, corner radii, hole depth, tool access or tolerance allocation. These recommendations can reduce machining time and cost without affecting the intended function of the part.

Machinable Materials of CNC Precision Machining Service

Material selection affects machining accuracy, mechanical performance, surface finish, production cost and service life. Keywin machines a broad range of metals and engineering plastics for structural, mechanical, cosmetic, high-temperature and corrosion-resistant applications.

Common metal options include aluminum, stainless steel, carbon steel, alloy steel, brass, titanium, zinc alloys, Inconel and Invar 36. Engineering plastic options include ABS, POM, polycarbonate, nylon, PVC, PMMA, PEEK and PTFE.

When customers are uncertain about the most suitable material, our team can compare options based on strength, weight, corrosion resistance, operating temperature, friction, electrical properties, appearance and budget. Material certificates and inspection documentation can be provided according to project requirements.

We support precision machining services of over 52 metals and engineering plastics, offering flexible and reliable material choices for diverse part production. Below is our available material information.

Metals & Alloys
Plastics

Metals	Characteristics	Common Grades
Aluminum Alloys	Lightweight, excellent machinability, and superior surface treatment compatibility.	6061, 7075, 5052, 2024, 6082, 6063, 2011, 5083, MIC6.
Stainless Steel	High corrosion resistance, exceptional strength, and long-term stability.	303, 304, 316, 17-4PH,Duplex 2205
Carbon Steel	High strength, stable processing, and excellent cost-efficiency.	1045 (45#), 1020,A36 (Q235), Q345.
Alloy Steel	Wear-resistant, high fatigue strength, and optimized mechanical properties post-heat treatment.	4140, 4340, D2, M2.
Brass	Excellent machinability, corrosion resistance, and high dimensional precision.	C360, C260, C280.
Zinc Alloys	Excellent fluidity, cost-effective, and ideal for precision aesthetic components.	Zamak 3 (Standard), Zamak 5 (High Strength), Zamak 2 (Wear Resistant),
Titanium Alloys	High strength-to-weight ratio, superior corrosion resistance, and lightweight (high machining difficulty).	Ti-6Al-4V (Grade 5), Grade 2 (CP).
Inconel	High-temperature resistance, corrosion resistance, and fatigue resistance; engineered for high-strength parts in extreme environments.	Inconel 718
Invar36	Extremely low coefficient of thermal expansion (CTE) at room temperature, excellent dimensional stability, and good ductility. It maintains nearly constant dimensions even during temperature fluctuations.	Invar36

Plastics	Characteristics	Common Grades
ABS	High toughness, easy to machine, and stable forming.	Prototypes, aesthetic housings, and functional validation parts.
PC (Polycarbonate)	Optical transparency, high toughness, and impact resistance.	Transparent components, protective covers, and jig/fixture housings.
POM (Delrin/Acetal)	Low friction coefficient, high wear resistance, and excellent dimensional stability.	Sliders, gears, bushings, and moving structural parts.
PA (Nylon)	High toughness, wear resistance, and heat resistance	Fasteners, load-bearing components, and industrial machinery parts.
PEEK	High-temperature resistance, superior chemical resistance, and extreme mechanical performance.	Aerospace, medical, and high-end precision engineering.
PMMA (Acrylic)	High transparency and excellent visual clarity.	Light covers, windows, and display-grade structural parts.
PVC / PTFE (Teflon)	Chemical/corrosion resistance and non-stick surface properties (PTFE).	Seals, gaskets, and corrosion-resistant structural components.

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Surface Treatment Capability

We offer a variety of surface treatment services for CNC machined parts to enhance their appearance, corrosion resistance, and mechanical strength. Whether the parts are metal or plastic, we can select the most suitable combination of processes based on the specific application.

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Basic & Pretreatment Finishes

Cleaning, deburring, and surface preparation to ensure a contamination-free base for subsequent finishing processes.

● Deburring: Removes sharp edges and burrs, improving part safety and appearance.

● Cleaning: Removes cutting fluid, residue, and oxide layer; ensures a contamination-free surface.

● Surface Preparation: Shot blasting or chemical preparation to achieve the anchor profile and cleanliness level required for coating adhesion.

Mechanical Finishes

Physical processes that improve surface flatness, smoothness, and texture.

● Sanding / Grinding: Removes machining marks and smooths surfaces.

● Polishing: Improves surface smoothness and gloss.

● Brushing: Creates uniform directional surface textures.

● Sandblasting / Bead Blasting: Removes oxides and creates a matte textured finish.

Protective Finishes

Chemical and electrochemical processes that enhance corrosion resistance and surface protection life.

● Anodizing (Type II / III): Forms a protective oxide layer for improved corrosion and wear resistance.

● Electroplating: Applies a metal coating to improve corrosion resistance, conductivity, and appearance.

● Hot Dip Galvanizing: Creates a thick zinc coating for long-term corrosion protection.

● Dacromet Coating: High salt spray resistant zinc-aluminum anti-corrosion coating.

Decorative & Marking Finishes

Processes that enhance appearance quality and apply permanent identification.

● Anodizing Coloring: Adds durable and uniform color after anodizing.

● Powder Coating: Forms a durable and weather-resistant protective coating.

● Paint Spraying: Creates decorative and protective surface finishes.

● Pad / Silk Printing: Applies logos, labels, and markings onto surfaces.

● Laser Marking: Permanently engraves logos, serial numbers, and codes.

Hardening & Functional Treatments

Processes that increase surface hardness, wear resistance, and functional performance.

● PVD / Vacuum Plating: Applies hard decorative coatings for improved wear resistance.

● Salt Bath Nitriding / QPQ: Enhances surface hardness, wear resistance, and corrosion resistance.

● Electroless Plating: Creates uniform metal coatings without electricity.

● Phosphating: Improves corrosion resistance and coating adhesion.

Our Services

Prototype Manufacturing

For concept validation and first article confirmation. We produce single pieces to small quantities typically within 3–7 working days, with a first article inspection report — allowing dimensional, assembly, and functional verification before committing to small-batch production.

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Small Batch Production

For prototype validation, new product development, and market testing. We support rapid prototyping and small-batch trial production with flexible process and material options, helping customers complete validation within short lead times and reduce early-stage development risk.

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Mass Production

For long-term programs and large-volume requirements. Backed by multiple advanced machines and a well-established process system, we deliver high-precision, high-consistency mass production with stable on-time delivery to meet continuous supply requirements.

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Application Industries

Consumer Electronics

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Marine

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Robotics & Automation

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Automotive

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Manufactures high-strength components (engine casings, suspension brackets, connecting seats) for automobiles, motorcycles, and off-road vehicles.

Outdoor Equipment

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Case Studies

Bicycle Seat Suspension Link - ODM Customization & Development

Why Choose Our
CNC Milling Service

Excellent Service Support
Advanced Equipment & Quality Control
Flexible Machining Capability
Customization & Engineering Support

Excellent Service Support

We provide efficient, transparent one-stop machining services with rapid response throughout the entire process from communication to delivery.

24-hour quoting / rapid prototyping

Support for small batches and rush orders

Quality issue resolution with corrective and replacement solutions

Advanced Equipment & Quality Control

100+ CNC machines covering lathes, milling centers, and 5-axis machining centers.

100+ CNC machines, annual production capacity of tens of millions of parts

Precision ±0.005 mm, CMM full inspection

Comprehensive quality management system ensuring consistency

Flexible Machining Capability

Integrated multi-process solutions for diverse component requirements.

Full coverage: CNC turning, milling, 5-axis, forging, and casting

Supports component assembly and multi-part machining coordination

Capable of processing various metals and engineering plastics

Customization & Engineering Support

Full OEM / ODM support for collaborative development from design to delivery.

Supports custom production from drawings, samples, or concepts

Facilitates structural improvements and tailored machining solutions

Customized packaging and surface treatment options available

FAQ

Do you accept prototype or small-batch orders?

Yes. We can flexibly handle orders from single prototypes to mass production.Sample lead time is typically 3–7 working days.
What is your Minimum Order Quantity (MOQ)?

We have no MOQ for CNC machining — prototypes, small batches, and mass production are all welcome.
What is your production lead time?

For samples: 3-7 days. For mass production: 10-30 days after order confirmation, depending on the order quantity and part complexity. Rush services are available for urgent projects.
What’s your cnc machined parts price?

As all parts are custom-made, we don’t have a fixed price list. Pricing depends on the part’s design, material, surface finish, and quantity. Once we receive your drawings or requirements, our team will evaluate them and provide an accurate quotation within 24 hours.
What are your payment terms?

Our standard payment terms are:

Orders < $1,000: 100% payment in advance.

Orders ≥ $1,000: 50% deposit, 50% balance before shipment.

We are flexible and can discuss terms for long-term projects.
How do you arrange shipping and delivery?

We offer various delivery options — express (DHL, FedEx, UPS), air freight, fast sea shipping, China–Europe Railway, and standard sea freight — under FOB, CIF, or DDP terms. Typical transit times: 3–5 days by express, 7–10 by air, and 20–45 by sea or railway.
What information do I need to provide for a quotation?

To provide an accurate quote, please share 2D drawings (PDF/DWG) and 3D models (STEP/IGS/X_T preferred) along with quantity, material, and surface finish details. If you don’t have drawings, send us a sample or sketch with dimensions — we’ll help create them.
How do you handle quality issues?

If any quality issue is found, we will promptly evaluate the cause and provide corrective, rework, or remake solutions to ensure the parts meet specifications.
Can you sign a Non-Disclosure Agreement (NDA)?

Yes. We strictly protect customers’ intellectual property and design confidentiality, and can sign an NDA to ensure project security.
What if I don't have drawings? Can you help?

Of course. We offer ODM (Original Design Manufacturing) services — you can simply provide sketches, photos, or reference samples, and our engineering team will help turn your idea into a manufacturable design.

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