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CNC Milling

We have strict standard for CNC Milling

HL Part supports 3/4/5 axis CNC milling and horizontal CNC milling services, helping you quickly obtain custom CNC metal milling parts from simple to complex.

Our Milling Capability

We have strict standard for CNC Milling

3-axis Milling

3-axis milling is the most commonly used CNC machining method, typically employed for producing simple parts, offering lower equipment costs.

4-axis Milling

4-axis milling is ideal for high-volume production of polyhedral parts, enabling simultaneous machining of three-dimensional surfaces from multiple angles.

5-axis Milling

5-axis machining enables the production of highly complex 3D geometries, offering both design flexibility and cost-effective manufacturing.

Horizontal CNC Milling

Horizontal CNC milling is a CNC milling method in which the cutting spindle is kept parallel to the table. The rigidity of the machine tool is superior.

Maximum Part Size for 3 and 3+2 axis CNC Milling

There are several types of CNC milling machines, each with its own distinct maximum part size. 3-axis and 3+2 axis machines have the lowest start-up costs and can produce parts with relatively simple geometries.

3-axis CNC Milling
Size	Max. part size for soft metals [1] & plastics	Max. part for hard metals [2]	Min. feature size
Metric units	2000 x 1500 x 200 mm 1500 x 800 x 500 mm	1200 x 800 x 500 mm	Ø 0.50 mm
Imperial units	78.7 x 59.0 x 7.8 in 59.0 x 31.4 x 27.5 in	47.2 x 31.4 x 19.6 in	Ø 0.019 in
Material	View All CNC Available Materials

3+2 axis CNC Milling
Size	Max. part size for soft metals [1] & plastics	Max. part for hard metals [2]	Min. feature size
Metric units	2000 x 1500 x 200 mm	1200 x 800 x 500 mm	Ø 0.50 mm
Imperial units	78.7 x 59.0 x 7.8 in	47.2 x 31.4 x 19.6 in	Ø 0.019 in
Material	View All CNC Available Materials

Maximum Part Size for 5-axis CNC Milling

The more advanced of the milling machine family, 5-axis centers can produce parts with more complex geometries. These machines require fewer machine setups so they are more productive.

5-axis CNC Milling
Size	Max. part size for all materials	Min. feature size
Metric units	2000 x 1500 x 200 mm	Ø 0.019 in
Imperial units	78.7 x 59.0 x 7.8 in	Ø 0.019 in
Material	View All CNC Available Materials

Tolerance

HL Parts CNC Milling Tolerances

Our production services can help you achieve the tightest tolerances required for non-standard custom CNC machined parts,Level 5 and Level 6 geometric tolerance requirements are our advantage, and we have a wealth of classic parts cases.

CNC Machining Tolerances		Linear dimension range(mm)
Type	Geometric Characteristics	Symbol	0.5–3	3–6	6–30	30–120	120–400	400–1000	1000–2000
Dimension	Length		±0.005		±0.01		±0.02		±0.05
	Diameter			0.006	0.002	0.002	0.005	——	——
	Angle		±0.01				±0.01	±0.05	——
Form	Straightness		±0.002		0.003		0.005	0.01	——
	Flatness		0.001		0.003	0.003	0.005	0.01	0.1
	Circularity		0.001		0.001	0.002	0.003	——	——
	Cylindricity		0.002		0.002	0.003	0.05	0.2	——
Profile	Profile of a line		0.002		0.002	0.003	0.01	0.02	0.3
Profile	Circularity		0.01		0.02	0.05	0.1	0.15	0.3
Orientation	Parallelism		0.003		0.005	0.01	0.05	0.1	——
	Perpendicularity		0.002		0.002	0.05	0.01	0.1	——
	Angularity		0.002			0.02		0.1	——
Location	Position		0.01		0.02		0.05	0.1	0.2
	Concentricity		0.002		0.002	0.005	0.01	——	——
	Symmetry		0.01		0.02		0.05	0.1	——
Runout	Circular Runout		0.001		0.003		0.005	0.01	±0.05
Runout	Circularity		0.003		0.005		0.01	0.02	——

*Please clearly indicate tolerances for nominal sizes below 0.5mm on your technical drawing.

CNC Milling Design Guidelines

Check the recommended and technically feasible values for the most common features encountered in CNC machined parts.

Feature	Recommended size	Feasible size
Min. feature size	Ø 2.5 mm	Ø 0.50 mm
Internal edges	R 8 mm	R 0.25 mm
Minimum wall thickness	0.8 mm (for metals) 1.5 mm (for plastics)	0.5 mm (for metals) 1.0 mm (for plastics)
Holes	Diameter: standard drill bit sizes Depth: 4 x diameter	Diameter: Ø 0.5 Depth: 10 x diameter
Threads	Size: M6 or larger Length: 3 x diameter	Size: M2

Gallery of CNC Milling Parts

HL Parts CNC Milling Parts

CNC Milling Materials

Available materials for CNC milling

Plastic

PMMA

PET

PEEK

ABS

PEI

POM

Metal

Bronze

Aluminum

Cooper

Steel

Stainless Steel

Titanium

Magnesium

Brass

PMMA

PMMA (Polymethyl Methacrylate), also known as acrylic, is a transparent thermoplastic with excellent optical clarity, UV resistance, and weatherability. It is widely used in applications such as optical lenses, signage, and display panels due to its glass-like properties and lightweight nature.

Appearance
Transparent, translucent, or opaque, available in clear, colored, or frosted finishes.

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PET

PET (Polyethylene Terephthalate) is a high-performance thermoplastic polyester with outstanding mechanical properties, clarity, and barrier resistance to gases and moisture. It is predominantly used in beverage bottles, food packaging, and synthetic fibers for textiles.

Appearance
Transparent or opaque, often clear or custom-colored for packaging and industrial applications.

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PEEK

PEEK (Polyether Ether Ketone) is a high-performance engineering thermoplastic renowned for its exceptional mechanical properties, chemical resistance, and thermal stability, even at elevated temperatures (up to 260°C/480°F). It exhibits excellent wear resistance, low moisture absorption, and biocompatibility, making it ideal for demanding applications in aerospace, automotive, medical implants, and oil and gas industries.

Appearance
Opaque, typically available in natural (beige/tan), black, or custom-engineered colors, with a smooth surface finish.

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ABS

ABS (Acrylonitrile Butadiene Styrene) is a tough, impact-resistant thermoplastic with good mechanical properties and processability. It is commonly used in automotive components, consumer electronics, and 3D printing due to its balance of strength, rigidity, and surface finish.

Appearance

Opaque, typically available in white, black, or custom colors.

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PC (Polycarbonate) is a high-performance thermoplastic known for its exceptional impact strength, optical clarity, and thermal resistance. It offers excellent dimensional stability and electrical insulation properties, making it suitable for applications such as safety glasses, electronic components, automotive parts, and medical devices.

Appearance
Transparent, translucent, or opaque, available in clear, colored, or custom-engineered finishes.

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PEI

PEI (Polyetherimide) is a high-performance engineering thermoplastic known for its exceptional thermal stability, mechanical strength, and flame resistance. It is used in demanding applications such as aerospace components, medical devices, and electrical insulators due to its ability to withstand high temperatures and harsh environments.

Appearance
Opaque, usually amber or black, with a smooth surface finish.

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PA (Polyamide), or polyamide, is an engineering thermoplastic characterized by high mechanical strength, thermal stability, and excellent resistance to wear and abrasion. It is commonly utilized in high-performance applications such as gears, bearings, and structural components in automotive and aerospace industries.

Appearance
Typically opaque, available in natural (off-white), black, or custom-engineered colors.

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POM

POM (Polyoxymethylene) also known as acetal or polyacetal, is a high-strength, low-friction thermoplastic with excellent dimensional stability and wear resistance. It is commonly used in precision parts such as gears, bearings, and conveyor systems due to its durability and low moisture absorption..

Appearance
Opaque, typically white, black, or natural (off-white), with a smooth, glossy surface.

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Bronze

Bronze is a copper-based alloy primarily composed of copper and tin, known for its excellent wear resistance, corrosion resistance, and low friction properties. It is widely used in bearings, bushings, marine hardware, and artistic sculptures due to its durability and machinability.

Appearance
Metallic, reddish-brown to golden-brown hue, often with a polished or patinated surface.

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Aluminum

Aluminum is a lightweight, non-ferrous metal with excellent corrosion resistance, high strength-to-weight ratio, and good thermal and electrical conductivity. It is commonly used in aerospace, automotive, packaging, and construction industries.

Appearance
Silvery-white, often with a matte or polished finish, and can be anodized for additional color options.

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Cooper

Copper is a highly conductive, ductile metal with excellent thermal and electrical properties. It is widely used in electrical wiring, electronics, plumbing, and heat exchangers due to its reliability and efficiency.

Appearance
Metallic, reddish-orange with a distinctive luster, often developing a green patina over time when exposed to air.

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Steel

Steel is an iron-based alloy containing carbon and other elements, known for its high strength, durability, and versatility. It is used in construction, automotive manufacturing, tools, and machinery due to its adaptability and cost-effectiveness.

Appearance
Metallic, silvery-gray, often with a matte or polished finish, and can be coated or treated for enhanced properties.

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Stainless Steel

Stainless steel is a corrosion-resistant alloy of iron, chromium, and other elements, offering high strength, durability, and hygiene. It is widely used in kitchenware, medical instruments, construction, and chemical processing industries.

Appearance
Metallic, silvery with a polished or brushed finish, maintaining its luster even in harsh environments.

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Titanium

Titanium is a lightweight, high-strength metal with exceptional corrosion resistance and biocompatibility. It is used in aerospace, medical implants, and marine applications due to its durability and ability to withstand extreme conditions.

Appearance
Metallic, silvery-gray with a matte or polished finish, often exhibiting a slight sheen.

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Magnesium

Magnesium is a lightweight, highly reactive metal with excellent strength-to-weight ratio and good machinability. It is used in automotive components, aerospace structures, and electronics due to its lightweight and damping properties.

Appearance
Metallic, silvery-white with a dull or slightly shiny surface, often coated to prevent oxidation.

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Brass

Brass is a copper-zinc alloy known for its malleability, acoustic properties, and corrosion resistance. It is widely used in musical instruments, plumbing fittings, decorative items, and electrical components.

Appearance
Metallic, yellowish-gold with a polished or brushed finish, often developing a patina over time.

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CNC Milling Surface Finishing

Anodizing

Polishing

Black Oxide

Powder Coating

Smooth Machining

View Full CNC Finished List

Application of CNC machining

Industrial Equipment

Sports

Automative

Robotics & Automation

Medical

Consumer Products

Aerospace & UAV

Tooling & Industrial manufacturing

Precision machining produces CNC-machined gearboxes and hydraulic valve bodies with micron-level tolerances, ensuring optimal power transmission and fluid control. These components enhance operational efficiency, reduce wear, and minimize downtime in heavy-duty equipment.

Sports

Titanium bicycle cranks and carbon fiber golf club heads deliver lightweight, high-strength performance, improving athlete precision and endurance while maintaining durability.

Automative

High-precision engine pistons and transmission gears are crafted for tight tolerances, enhancing fuel efficiency, reducing emissions, and ensuring reliable vehicle performance.

Robotics & Automation

Harmonic drive systems and aluminum actuator housings enable precise motion control and lightweight design, critical for advanced automation and robotic applications.

Medical

We machining creates titanium orthopedic implants and stainless steel surgical instruments, ensuring biocompatibility, sterilization compliance, and precise functionality for patient safety.

Consumer Products

Precision-machined aluminum smartphone frames and ceramic watch bezels combine durability with aesthetic appeal, enhancing user experience and product longevity.

Aerospace & UAV

Turbine blades and airframe components are crafted from advanced alloys like Inconel, offering high strength-to-weight ratios and thermal resistance for extreme aerospace conditions.

Resource

Quality Control Standards

We offer online access to measurement data, PO order tracking, material reports, 3D CMM results, surface treatment reports, COCs, and packing lists.

Customized Solution

We tailor the optimal solution by aligning the specific technical requirements of parts processing with the unique needs of different industries

Supply Chain

Our supply chain must obtain the ISO9001 quality system certificate, and review the quality planning of the "Quality Manual", and sign a supply chain agreement after the review

Process Control

HL Parts implements a fully integrated process management system, where the MES automatically schedules production whenever discrepancies in measurement data are detected, ensuring timely delivery

Demand Analysis

assessing customer needs, generate RFQs and POs, and provide real-time project and production updates online.

CNC Milling FAQ

Any confusion?

Click to answer your question

What is the CNC Milling Machining

CNC milling is a subtractive manufacturing process. In this process, computer numerical control (CNC) systems are used to precisely control the movement of multi-axis milling cutters. These cutters rotate at high speeds to remove material from a workpiece, enabling the production of complex 3D shapes with high accuracy, tight tolerances, and smooth surface finishes.

Is the Sample Fully Representative of Mass Production Quality?

Yes, samples can fully represent mass production quality when produced under identical conditions, using the same materials, equipment, and processes. At HL Parts, we ensure this consistency through strict quality control and advanced inspection tools, guaranteeing that samples accurately reflect the precision and reliability of bulk orders.