Custom CNC Milling Services
PartsMastery is a professional CNC milling company providing precision CNC milling services for metal and plastic parts. From rapid prototyping to full-scale production, we deliver custom CNC milling parts with tolerances as tight as 0.005 mm and lead times as fast as 1 day.
STEP | STP | SLDPRT | IPT | PRT | SAT files
Online CNC Milling Services for Custom Parts
- 3-Axis CNC Milling Services
ur 3-axis CNC milling services are ideal for cost-effective machining of simple geometries. We deliver consistent accuracy for flat and prismatic parts using advanced CNC milling machines.
- 4-Axis CNC Milling Services
4-axis CNC milling allows multi-side machining in a single setup, reducing repositioning errors and improving efficiency. This service is widely used for custom CNC milling parts with complex side features.
- 5-Axis CNC Milling Services
Our 5-axis CNC milling service supports highly complex and precision-critical components. It is the preferred solution for aerospace, medical, and high-tolerance CNC milling applications.
CNC Machining Solutions
Prototyping
Rapid Prototyping
Accelerate product development with our rapid CNC machining services. We offer fast turnaround times and specialize in quick production of high-quality prototypes and mold tooling, aiding your design verification process.
Production
Low and High-Volume Production
Whether you need small batches or large-scale production, we can offer you both. With stringent tolerance controls and comprehensive capabilities, we adapt to your volume requirements without compromising on quality.
CNC Milling Materials for Custom Parts
Our plastic and metal CNC milling solutions offer a diverse range of materials, ensuring precision and durability. This vast selection empowers our clients with optimal choices for their unique projects, boosting their product’s quality and performance.
Metals
ABS is strong, durable, and offers good resistance to heat and impact. It’s preferred for automotive components and consumer goods.
ABS Beige(Natural)
ABS Black
ABS Black Antistatic
ABS Milky White
ABS+PC Black
ABS+PC White
Polycarbonate is extremely durable and has high impact resistance, along with excellent clarity, used for bullet-proof glass and protective gear.
PC Black
PC Transparent
PC White
PC Yellowish White
PC+GF30 Black
PMMA, or acrylic, is known for its crystal clarity and weather resistance, making it ideal for outdoor fixtures and display cases.
PMMA Black
PMMA Transparent
PMMA White
POM is strong, with a low friction surface and good dimensional stability, perfect for precision parts in mechanical applications.
Dark brown (coffee) POM 100AF
POM Black
POM Blue
POM White
Nylon is versatile, strong, and wears well against friction, commonly used for gears, bearings, and other wear-resistant surfaces.
PA(Nylon) Blue
PA6 (Nylon)+GF15 Black
PA6 (Nylon)+GF30 Black
PA66 (Nylon) Beige(Natural)
PA66 (Nylon) Black
Polyethylene is lightweight and has high resistance to impact, widely used in packaging and containers.
PE Black
PE White
PEEK is renowned for its high temperature resistance and strength, often used in aerospace and medical implant manufacturing.
PEEK Beige(Natural)
PEEK Black
Polypropylene is tough, has excellent chemical resistance, and is used for automotive parts, containers, and in packaging.
PP Black
PP White
PP+GF30 Black
HDPE is known for its high strength-to-density ratio, resistance to impacts, and is used in making bottles and corrosion-resistant piping.
HDPE Black
HDPE White
HIPS is easy to machine and offers good dimensional stability and impact resistance, suitable for prototyping and modeling.
HIPS Board White
LDPE is soft, flexible, and used in applications where heat sealing is required, such as in tubing and plastic bags.
LDPE White
PBT is a strong, rigid plastic that is heat resistant and commonly used in electrical components and casings.
PBT Black
PBT Milky White（Natural）
PPA offers high heat resistance and stiffness, ideal for automotive and electrical applications that require durability at high temperatures.
PAI has exceptional thermal and chemical stability, used in high-performance parts in aerospace and automotive sectors.
PAI Brown
PET is strong, resistant to moisture and chemicals, and widely used in food containers and textile fibers.
PET Black
PET White
PET+GF30 Black
PET+GF30 White
PPS features outstanding chemical and heat resistance, suitable for automotive and aerospace components.
PPS Black
PPS White
PPS+GF30 Black
PPS+GF30 White
PPS features outstanding chemical and heat resistance, suitable for automotive and aerospace components.
PPS Black
PPS White
PPS+GF30 Black
PPS+GF30 White
PVC is robust, cheap, and has good chemical resistance, used in plumbing, medical devices, and cables.
PVC Grey
Plastics
Aluminum is lightweight yet strong, with excellent machinability and corrosion resistance. Ideal for aerospace and automotive parts.
Alloys
Aluminum 6061, 6061-T6
Aluminum 2024
Aluminum 5052
Aluminum 5083
Aluminum 6063
Aluminum 6082
Aluminum 7075, 7075-T6
Aluminum ADC12 (A380)
Aluminum is lightweight yet strong, with excellent machinability and corrosion resistance. Ideal for aerospace and automotive parts.
Alloys
Aluminum 6061, 6061-T6
Aluminum 2024
Aluminum 5052
Aluminum 5083
Aluminum 6063
Aluminum 6082
Aluminum 7075, 7075-T6
Aluminum ADC12 (A380)
Brass is durable and has a low friction coefficient, which makes it suitable for fittings, tools, and musical instruments that require precision.
Alloys
Brass C27400
Brass C28000
Brass C36000
Bronze is highly resistant to corrosion and metal fatigue, favored for bearings, bushings, and marine hardware.
Alloys
Tin Bronze
Steel is an alloy with high tensile strength and durability, commonly used in construction and automotive industries for its robustness.
Alloys
Steel 1018, 1020, 1025, 1045, 1215, 4130, 4140, 4340, 5140, A36
Die steel
Alloy steel
Chisel tool steel
Spring steel
High speed steel
Cold rolled steel
Bearing steel
SPCC
Stainless steel is renowned for its corrosion resistance, making it a prime choice for medical devices and food processing equipment.
Alloys
Stainless Steel SUS201
Stainless Steel SUS303
Stainless Steel SUS 304
Stainless Steel SUS316
Stainless Steel SUS316L
Stainless Steel SUS420
Stainless Steel SUS430
Stainless Steel SUS431
Stainless Steel SUS440C
Stainless Steel SUS630/17-4PH
Stainless Steel AISI 304
Magnesium is the lightest structural metal, offering high strength-to-weight ratios, perfect for automotive and aerospace applications where weight is critical.
Alloys
Magnesium Alloy AZ31B
Magnesium Alloy AZ91D
Titanium boasts the highest strength-to-density ratio among metals, highly resistant to corrosion and fatigue, ideal for aerospace, medical, and marine applications.
Alloys
Titanium Alloy TA1
Titanium Alloy TA2
Titanium Alloy TC4/Ti-6Al 4V
CNC Milling Surface Finishes
Gain access to quality surface finishing for custom CNC milled parts to remove aesthetic flaws and improve the appearance of your products. We also provide rigid protection and additional resistance and strength to your parts through superior surface finishes.
- As Machined
As machined finish leaves the surface straight from the CNC machine, providing a cost-effective option with tool marks.
- Anodizing
Anodizing increases corrosion resistance and wear properties, while allowing for color dyeing, ideal for aluminum parts.
- Polishing
Polishing achieves a high gloss finish, reducing surface roughness and enhancing the aesthetic appeal of metals.
- Sand Blasting
Sand blasting uses pressurized sand or other media to clean and texture the surface, creating a uniform, matte finish.
- Brushed Finish
A brushed finish creates a unidirectional satin texture, reducing the visibility of marks and scratches on the surface.
- Powder Coating
Powder coating applies a thick, wear-resistant layer with excellent color and texture options, suitable for a variety of surfaces.
- Electroplating
Electroplating bonds a thin metal layer onto parts, improving wear resistance, corrosion resistance, and surface conductivity.
- Black Oxidize
Black oxidize is a conversion coating for ferrous metals that improves corrosion resistance and minimizes light reflection.
- Tumbling
As machined finish leaves the surface straight from the CNC machine, providing a cost-effective option with tool marks.
- Electropolish
As machined finish leaves the surface straight from the CNC machine, providing a cost-effective option with tool marks.
- Alodine
As machined finish leaves the surface straight from the CNC machine, providing a cost-effective option with tool marks.
- Heat Treatment
As machined finish leaves the surface straight from the CNC machine, providing a cost-effective option with tool marks.
Tolerances for CNC Milling
CNC milling tolerances define how precisely part dimensions are controlled during machining.
Our precision CNC milling services follow ISO 2768-m for metals and ISO 2768-c for plastics, delivering stable, repeatable dimensional accuracy across 3-axis, 4-axis, and 5-axis CNC milling.
| 3-Axis | 4-Axis | 5-Axis | |
|---|---|---|---|
| Maximum Part Size | 1000 x 500 x 500 mm | 1000 x 500 x 500 mm | 4000×1500×600 mm |
| Minimum Part Size | 5 x 5 x 5 mm | 5 x 5 x 5 mm | 5 x 5 x 5 mm |
| General Tolerances | ±0.1 mm | ±0.1 mm | ±0.05 mm |
| Lead Time | Delivery of simple parts can be as fast as 1 day. | 5 bussiness days for most projects. | 5 bussiness days for most projects. |
CNC Milling Design Guidelines
| Recommended Size | |
|---|---|
| Radii | Internal radii should be at least 1/3 of the cavity depth. Use larger radii whenever possible. |
| Threads and Tapped Holes | Diameter Φ 1.5-5 mm, depth: 3 times the diameter. Diameter Φ 5 mm or larger, depth: 4-6 times the diameter. PartsMastery can produce threads of any specification and size as required by the customer. |
| Minumum Wall Thickness | For metals: 0.8 mm; For plastics: 1.5 mm. Thicker walls ensure better structural integrity. |
| Text | CNC Milling: Minimum width of 0.5 mm and depth of 0.1 mm. PartsMastery can create standard text via CNC engraving or laser engraving as per customer requirements. |
| Holes | Minimum diameter of 1 mm. Hole depth should not exceed 4 times the diameter for best results. |
Why Choose Us
/01
Precision CNC Milling Parts
Our precision CNC milling services with tolerances as tight as ±0.01 mm.
Our advanced CNC milling machines ensure consistent accuracy for custom metal and plastic parts.
/02
Fast & Scalable CNC Milling Production
As a factory-direct CNC milling service supplier, we reduce lead times without compromising quality.
Simple CNC milled parts can be delivered in as fast as 1 day.
/03
Engineering Support
As an experienced CNC milling company, our engineers provide DFM feedback and machining guidance to optimize designs for cuostom CNC milling services, helping reduce cost and improve manufacturability.
CNC Milling Process for Custom Part Manufacturing
Our CNC milling process starts with CAD file analysis and DFM review, followed by precision machining on 3, 4, or 5-axis CNC milling machines.
This streamlined workflow ensures accuracy, repeatability, and efficiency for custom CNC milling parts.
- High-precision metal and plastic parts
- Complex geometries with 3/4/5-axis CNC milling
- Prototypes and production CNC milling parts
- Aerospace, automotive, medical, and industrial components
FAQs
What kinds of CNC milling machines does PartsMastery have?
At PartsMastery, we have a variety of CNC milling machines to meet diverse manufacturing needs. Our inventory includes 3-axis, 4-axis, and 5-axis CNC milling machines.
The 3-axis machines are perfect for simple operations, handling basic cutting tasks along the X, Y, and Z axes.
Our 4-axis machines add an extra rotational axis, allowing for more complex geometries and more efficient production of parts with features that require continuous machining around a fourth axis.
Finally, our advanced 5-axis CNC milling machines offer the highest level of precision and versatility, enabling the creation of intricate parts with complex shapes and angles.
These machines are capable of machining in five different axes simultaneously, reducing the need for multiple setups and ensuring exceptional accuracy and quality in every component we produce.
What tolerances can you achieve with CNC milling?
Our CNC milling tolerances depend on machine type, material, and part geometry.
Standard tolerances follow ISO 2768-m (metals) and ISO 2768-c (plastics)
Typical general tolerances: ±0.1 mm
High-precision 5-axis milling can achieve tolerances as tight as ±0.01 mm for critical features
For tighter tolerances, we recommend specifying requirements directly on the drawing so our engineers can optimize tooling, inspection, and cost.
When should I choose 3-axis, 4-axis, or 5-axis CNC milling?
3-axis milling is ideal for simple geometries and flat features
4-axis milling enables machining around multiple sides with fewer setups
5-axis milling is best for complex geometries, tight tolerances, and parts requiring multi-angle machining
Choosing the right axis configuration can significantly reduce lead time and improve accuracy.
How fast can you deliver CNC milled parts?
Lead times depend on part complexity and machining axis:
Simple 3-axis parts can be delivered in as fast as 1 day
Most CNC milling projects are completed within 5 business days
Expedited options are available for urgent production needs.
CNC milling vs CNC turning: how do I choose?
CNC milling is ideal for complex geometries, slots, pockets, and contours, while CNC turning is best suited for cylindrical parts such as shafts and bushings.
If your part includes both rotational and prismatic features, combining milling and turning may be the most efficient solution.
What are the Differences Between Vertical and Horizontal CNC Milling?
Vertical CNC milling machines, with their vertically oriented spindles, are ideal for precision work on smaller components, offering excellent visibility and versatility for tasks like drilling and boring. Horizontal CNC milling machines, featuring horizontally oriented spindles, excel in handling larger, heavier workpieces and provide enhanced stability and efficient chip removal. For projects requiring extensive material removal and high durability, horizontal milling is preferred. In contrast, vertical milling is best for intricate, detailed work. Choosing between these types depends on your specific CNC milling services needs, whether for precision or bulk machining.
What is tool offset in CNC milling?
In CNC milling, tool offset refers to the adjustment made to account for the tool’s dimensions—specifically its length and diameter—during the machining process. These offsets ensure that the cutting tool operates with precision relative to the workpiece. By accurately setting tool offsets, a machinist can determine the correct starting point for machining, ensuring that the part is cut to the exact specifications required. Proper tool offsets are crucial for achieving accurate and consistent results in CNC milling operations.
What is CNC millingmilling?
CNC milling is a subtractive manufacturing process where material is removed from a solid block using rotating cutting tools controlled by computer programs.
CNC milling is widely used to produce precision parts with complex geometries, tight tolerances, and consistent quality. It supports multi-axis machining (3-axis, 4-axis, and 5-axis), allowing features such as pockets, slots, holes, and complex contours to be machined efficiently.
At PartsMastery, CNC milling is commonly used for functional prototypes, low-volume production, and end-use parts across industries such as automotive, aerospace, and industrial equipment.
What types of materials do CNC mills use?
CNC mills can work with a diverse range of materials. Metals frequently used include aluminum, brass, and steel, each offering different properties for various applications. Additionally, CNC milling is effective on various plastics such as ABS, acrylic, polycarbonate, and polypropylene, which are valued for their versatility and ease of machining. This variety of materials allows CNC mills to be employed in numerous industries, from aerospace to consumer products, making them a highly adaptable tool for manufacturing.