cnc machining drill milling an aluminum block

Low-volume CNC Machining for Production Parts

Reduce part costs with higher quantities of machined parts

Cost-efficient machined parts at any quantity.

CNC Parts

Enhanced Machining Capabilities with Our Digital Network 

Get anodizing, tighter tolerances, and volume pricing options through our network of manufacturing partners powered by Hubs. You'll find plating (black oxide, nickel), anodizing (Type II, Type III), and chromate coating at scale; tolerances down to ±0.001 in. (0.020mm); and cost-efficient machined parts at higher volume.  

Try Digital Network at Hubs

We’re not only the fastest manufacturing supplier of machined prototypes but also the most reliable source of on-demand production parts. Why is this important? You have a single-source supplier from concept validation to short-run production.

We offer more competitive pricing at higher quantities in addition to tighter tolerances, hardware assembly, first article inspection (FAI) reporting, material certifications, and additional finishing options like anodizing and chromate plating. It’s CNC machining designed around your project needs—whether prototyping or production.

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Price Break

Starting at part quantity 15

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Lead Time

Shipped in as fast as 5 days

Finishing Options

Anodizing and Chromate Plating

cnc production quantity icon


15 to 1,000 or more parts


4 Reasons to Turn to Protolabs for Machined Production Parts

1. Reduced Piece-Part Price with Higher Quantities

Lower your part cost when you order higher volumes of production parts.

2. Inspection Reporting and Certifications

Get added quality assurance from conventional FAI reporting, CoC documentation, and AS9100 certification.

3. More Finishing Options

Choose from anodizing and chromate plating for complete parts from one supplier.

4. Supply Chain Flexibility

Avoid warehousing fees by ordering only the amount (starting at quantity 15) you need each month.

cnc aluminum production part manufactured by protolabs

Production Materials for CNC Machining

Materials Max. Part Size
Aluminum 6061 7 in. x 15 in. x 3 in. / 15 in. x 18 in. x 1.75 in.
Aluminum 7075 7 in. x 15 in. x 3 in. / 15 in. x 18 in. x 1.75 in.
ABS 7 in. x 15 in. x 1.75 in.
Steel 1018 7 in. x 15 in. x 1.75 in.
Steel 4140 7 in. x 15 in. x 1.75 in.
Stainless Steel 304L   7 in. x 12. in. x 1.75 in.
Stainless Steel 316L 7 in. x 12. in. x 1.75 in.
Stainless Steel 17-4 PH 7 in. x 12. in. x 1.75 in.
Acetal (black, white) 7 in. x 15 in. x 1.75 in.
Acetal Copolymer (black, natural) 7 in. x 15 in. x 1.75 in.
PEEK (black, natural) 7 in. x 15 in. x 1.75 in.
PEI (Ultem) 7 in. x 15 in. x 1.75 in.


black ABS plastic cnc production part manufactured by protolabs cnc machining service

Production parts can be machined in engineering-grade thermoplastic such as ABS (shown above) and Acetal (Delrin).

Production Capabilities for CNC Machining


  • Shop tolerance = +/- 0.005 in.
  • Able to hold +/- 0.002 in. for reamed holes (print required)
  • Up to +/- 0.002 in. feature location on the same side (print required)

Surface Roughness

  • Flat and perpendicular surfaces = 63 µ in.
  • Curved surfaces = 125 µ in.

Surface Finish Options

Multiple surface finishes are available for production machined parts.

As Machined

Tumbled (standard)

Bead blasted


This process is typically used on machined aluminum parts. Your anodizing options at Protolabs:

  • Type II
  • ROHS compliant
  • Class 1 (Clear)
  • Class 2 (Black)

Chromate Plating

Your chromate plating options at Protolabs:

  • Type I, Non-ROHS (Yellow)
  • Type II, ROHS (Clear)
  • Class 1A: for maximum protection against corrosion, painted or unpainted
  • Class 3: For maximum protection against corrosion where low electrical resistance is required

Hardware Assembly

  • Dowel pins
  • PEM inserts
  • Helicoils
  • Key inserts

Ink Stamping

  • Black and white

black anodize sheet metal part produced by protolabs

Anodizing applies a thin, protective coat to metal parts, forming a protective oxide layer to create a barrier against corrosion.

clear sheet anondize part manufactured by protolabs

Plating applies a thin metal coating to machined parts for corrosion resistance and improved cosmetic appearance.

If you have any issues getting your guide, click here to download.

Designing for CNC Automation

Our new guide helps you prepare your CAD models to ensure that they breeze through our end-to-end digital manufacturing process. With our guidelines, even highly precise parts can be machined fast.

Threading Options

Standard Threads Taper Pipe Threads Metric Threads Standard Helicoil  Threads
1-64 0-80 1/16-27 M1.6 x 0.35 2-56 2-64
2-56 1-72 1/8-27 M2.0 x 0.40 3-48 3-56
3-48 2-64 1/4-18 M2.5 x 0.45 4-40 4-48
4-40 3-56 3/8-18 M3.0 x 0.50 5-40 5-44
5-40 4-48 1/2-14 M3.5 x 0.60 6-32 6-40
6-32 5-44 3/4-14 M4.0 x 0.70 8-32 8-36
8-32 6-40   M4.5 x 0.75 10-24 10-32
10-24 8-36   M5.0 x 0.80 12-24 12-28
12-24 10-32 Special Threads M6.0 x 1.0 1/4-20 1/4-28
1/4-20 12-28 3.035-40 SM3 M7.0 x 1.0 5/16-18 6/16-24
5/16-18 1/4-28 2.035-40 SM2 M.0 x 1.25 3/8-16 3/8-24
3/8-16 5/16-24 1.035-40 SM1 M10 x 1.50 7/16-14 7/16-20
7/16-14 3/8-24   M12 x 1.75 1/2-13 1/2-20
1/2-13 7/16-20   M14 x 2.0    
  1/2-20   M16 x 2.0    
      M18 x 2.5    
      M20 x 2.5    


Quality Reporting

When all of your parts are machined at Protolabs you can be assured those parts are going to be produced in one of our AS9100- and ITAR-certified facilities and never outsourced to another machine shop. All parts are inspected for cosmetic conformance to workmanship standards and dimensional conformance on at least three dimensions (typically X, Y, and Z), but with production parts for machining, we also provide conventional inspection reporting like FAIs, Certificate of Compliance (CofC) documentation, and additional certifications like ISO 9001 and AS9100.