CNC Machining Materials Guide
Providing a robust selection of 100+ certified metals and plastics. From highly machinable Aluminum 6061 to extreme-temperature Inconel 718.
- ✓ Full Material Traceability (MTRs & CoC Available for every batch)
- ✓ Expert Machinability Index for cost-effective production
- ✓ ISO 9001 / JIS Compliant grades for Aerospace, Medical & EV
100% Material Traceability & PMI Verification
In mission-critical sectors like aerospace and medical, material failure is not an option. We do not rely solely on vendor certificates. Every batch of raw material entering our Dongguan facility undergoes rigorous Positive Material Identification (PMI) using in-house Olympus XRF spectrometers to verify exact alloy composition.
Audit-Ready Documentation
- ✓ Original Mill Test Reports (MTR)
- ✓ XRF Spectrometer Composition Scans
- ✓ Heat Lot Traceability Index
- ✓ Certificates of Conformance (CoC)
The Ultimate CNC Materials Database
Use our definitive engineering reference below to compare machinability, tensile strength, and regional compliance standards (FDA, RoHS, AS9102) before finalizing your CAD design. All metals listed below are backed by EN 10204 3.1 traceability.
| Material Family | Specific Grade | Characteristics & Compliance | Tensile Strength | Machinability Rating | Cost Index |
|---|---|---|---|---|---|
| Aluminum Alloys | 6061-T6 | The industry standard. Highly weldable, excellent for anodizing. [RoHS/REACH EU Compliant] | ~310 MPa | Excellent (270%) | Low ($) |
| 7075-T6 | Exceptional strength-to-weight ratio. Prone to cracking if welded. [AS9102 Aerospace Structures] | ~572 MPa | Good (150%) | Medium ($$) | |
| 2024-T3 | Outstanding fatigue resistance. Frequently used in aircraft fuselage. [FAA/EASA Compliance] | ~483 MPa | Good (150%) | Medium ($$) | |
| Steel & Stainless | Stainless 304 | Superior corrosion resistance, tough and non-magnetic. [Food Grade / General Industrial] | ~505 MPa | Fair (45%) | Medium ($$) |
| Stainless 316L | Added Molybdenum for extreme marine/chemical resistance. [ISO 13485 / FDA Ready Medical] | ~485 MPa | Difficult (36%) | High ($$$) | |
| 1018 Mild Steel | Excellent weldability, highly economical structural steel. [ISO 9001 Commercial COTS] | ~440 MPa | Excellent (78%) | Low ($) | |
| 4140 Alloy Steel | Chromoly steel. Extreme toughness and fatigue strength. [Heavy Equipment / Defense] | 655-1000+ MPa | Fair (66%) | Medium ($$) | |
| Exotic Metals | Titanium Gr. 5 | Ti-6Al-4V. Supreme strength-to-weight ratio. Low thermal conductivity. [Biocompatible / AS9102 Aerospace] | ~950 MPa | Difficult (22%) | Very High ($$$$) |
| Inconel 718 | Superalloy retaining strength at 700°C. Severe work-hardening. [NACE MR0175 Oil & Gas / Turbine] | ~1375 MPa | Extreme (15%) | Extreme ($$$$$) | |
| Copper & Brass | Copper C110 | Pure copper. 100% IACS electrical conductivity. Very gummy to machine. [High-Voltage EV / Semiconductor] | ~220 MPa | Poor (20%) | High ($$$) |
| Brass C360 | Free-machining brass. The absolute fastest metal to CNC machine. [High-Volume Swiss Turning] | ~338 MPa | Ultimate (100%+) | Low ($) | |
| Engineering Plastics | POM (Delrin) | High stiffness, excellent dimensional stability. Best plastic for tight tolerances. [RoHS Compliant / Low Friction] | ~65 MPa | Excellent | Low ($) |
| PEEK | Extreme heat/chemical resistance. Autoclavable. Requires annealing. [FDA Class VI / Surgical Implant] | ~100 MPa | Moderate | Very High ($$$$) |
* Machinability ratings use AISI 1212 steel as a 100% baseline. Lower percentages indicate higher hardness or gumminess, which requires slower spindle feeds, increases CNC tool wear, and raises manufacturing costs.
The Hidden Economics of
Machinability
Raw material price does not equal final part cost. A common mistake in product development is choosing a cheap raw material that is incredibly difficult to cut.
Example: While raw Brass C360 costs significantly more per kg than 304 Stainless Steel, Brass has a machinability rating of 100% vs Steel's 45%. For high-volume Swiss turning (10,000+ pcs), the brass part is machined 3x faster with near-zero tool wear, making the final unit cost of Brass actually cheaper than the steel counterpart.
Upload your 3D CAD. Our DFM engineers will analyze your design and recommend alternative alloys to slash your machine-hour costs.
Request Free DFM ReviewSelect Material by Engineering Property
Not sure which alloy or polymer to specify? Let the application drive your decision. Select your most critical engineering constraint below to find the optimal CNC machining materials.
Strength-to-Weight Ratio
Crucial for UAVs, drones, and weight-restricted automotive applications.
Extreme Temperature & Wear
For turbine engines, injection molds, and heavy-duty friction environments.
Bio-Compatibility & Chemical
FDA compliant, autoclavable, and chemically inert against harsh solvents.
Maximum Cost-Efficiency
Highest machinability ratings (100%+) for rapid cycle times in mass production.
Smart Cost Estimator
Test how material selection, volume, and tolerance impact your baseline costs. Select your parameters below, and our algorithm will calculate projected machining expenses and lead times based on global manufacturing averages.
Explore Core Material Families
Select a material category below to access deep-dive engineering guides, machinability ratings, and specific alloy properties.
Aluminum Alloys
6061-T6, 7075-T6, 2024. Lightweight, highly machinable, excellent for anodizing.
Explore Aluminum →Steel & Stainless
304/316L, 1018, 4140, D2. Unmatched strength, impact resistance, and hardenability.
Explore Steels →Titanium Alloys
Ti-6Al-4V (Gr 5), Grade 2. Supreme strength-to-weight ratio and biocompatibility.
Explore Titanium →Engineering Plastics
PEEK, POM (Delrin), Nylon, Teflon. Dielectric properties and extreme chemical resistance.
Explore Plastics →Copper Alloys
C110 Pure Copper, Beryllium Copper. Burr-free machining for ultimate thermal/electrical conductivity.
Explore Copper →Brass & Bronze
C360, C353. The ultimate free-machining metal. Low friction, aesthetic, and highly economical.
Explore Brass →Super & Exotic Alloys
Inconel 718, Hastelloy, Kovar. Defying extreme heat and pressure for aerospace and oil/gas.
Explore Superalloys →Don't See Your Alloy?
We source Magnesium, Zinc, and specialized composites via our global network.
Contact Engineering TeamMaterial Sourcing FAQ
Common questions from buyers regarding our material supply chain, certifications, and cost-optimization strategies.
How do I choose the most cost-effective CNC material?
Do you provide Material Test Reports (MTR) or CoC?
What is the most cost-effective metal for CNC machining?
How do I choose between CNC Machining Plastics vs. Injection Molding?
What if the specific alloy I need isn't on this list?
Overwhelmed by Material Choices?
Don't overpay for Titanium if Aluminum 7075 will do the job. Upload your CAD drawings today. Our senior metallurgists will provide a free DFM review to recommend the perfect balance of strength, weight, and cost.
Request Expert Material DFMFrom Material Selection to Final Part
Choosing the right alloy is step one. Navigate our ecosystem to see how our precision machinery and industry-specific expertise transform these raw materials into flight-ready and medical-grade components.
Machining Methods
Explore how we mill, turn, and EDM exotic alloys with ±0.001mm precision.
View CNC Services →Advanced Machinery
Review the multi-axis CNC centers and CMM tools that handle your specific material.
Inspect Equipment →Industry Usage
See how these materials perform in Aerospace, Medical, and Robotics applications.
View Sectors →Turnkey Production
Consolidate your supply chain with integrated molding, casting, and assembly services.
Explore Solutions →
PMI VERIFIED Curated by Chief Engineer Mose Li
Selecting the right alloy is the foundation of sub-micron precision. Mose Li leverages 20+ years of metallurgical analysis to curate this database. From managing the thermal expansion of Aluminum 7075 to mastering the work-hardening challenges of Inconel 718, Mose ensures that every material used at 3Q Machining is verified via Olympus XRF Positive Material Identification (PMI). He provides the bridge between raw CAD specs and real-world EN 10204 3.1 traceability.
