Aluminum Alloys
Common for lightweight housings, plates, brackets, fixtures and automation parts. Confirm alloy, temper, finish and cosmetic requirements.
Engineering Guide
CNC Machining Materials for Industrial Parts
Select material by function, strength, corrosion resistance, stability, finish compatibility, availability and total cost.
Material Selection
Common CNC machining materials
Material grade affects machinability, dimensional stability, corrosion resistance, surface finish, cost and delivery. Always state the exact grade when it matters.
Stainless Steel
Used for corrosion-resistant machine parts, food equipment components, shafts and housings. Confirm grade and passivation or polishing needs.
Carbon & Alloy Steel
Suitable for structural components, shafts, tooling and wear-related parts. Confirm heat treatment, hardness and coating requirements.
Brass & Copper Alloys
Used for bushings, fittings and electrical or thermal applications. Confirm alloy and lead-content requirements where relevant.
Engineering Plastics
Used for guides, spacers, wear components and insulation parts. Confirm operating temperature, load and chemical exposure.
Material Alternatives
Approved alternatives may reduce cost or lead time, but substitutions should never be made without customer confirmation.
Visual Reference
Material, process and finish references
Material choice affects machining behavior, distortion risk, corrosion resistance, finish compatibility and the inspection plan.
Material information to include in an RFQ
Exact Grade
For example 6061-T6, 304, 316L or a specified engineering plastic.
Certification
State whether a material certificate or traceability record is required.
Heat Treatment
Specify hardness, treatment sequence and testing requirement.
Surface Finish
Confirm coating type, color, thickness and cosmetic standard.
Alternatives
State whether equivalent grades may be proposed for review.
FAQ
Questions industrial buyers usually ask
Clear RFQ information reduces quotation assumptions and helps both sides compare the right manufacturing route.
Send a drawing for review →How should a CNC material be selected?+
Balance function, strength, weight, corrosion, machinability, finish compatibility, availability and cost.
Can an alternative material be proposed?+
Possible alternatives can be discussed, but they should not be substituted without buyer approval.
Why does material condition matter?+
Temper, hardness, heat treatment and stock form can affect machining behavior, distortion and final properties.
Should material certificates be requested in advance?+
Yes. Certificate and traceability requirements affect sourcing and should be included in the quotation basis.
Have a Part Drawing to Review?
Send the drawing, material, quantity, finish and application. We will review the manufacturing route and the information needed for quotation.