CNC Machining: a buyer's sourcing guide
Everything a procurement team should know before opening an RFQ for cnc machining: materials, tolerances, certifications and red flags.
Recent RFQs in cnc machining
Overview
CNC machining covers turning, milling and multi-axis cutting of parts from solid billet or bar. It is the most flexible technology for medium-precision and high-precision metal components, both prototypes and production batches.
When to choose this process
Pick CNC when geometry is complex, tolerances are tight (≤ ±0.05 mm) and quantities sit between 1 and a few thousand pieces per year.
Typical materials
- Aluminium 6082/7075
- Steel C45/AISI 304/316
- Brass
- Titanium Gr5
- POM/PEEK
Typical tolerances
Standard ±0.1 mm; tight ±0.01 mm on milled features; Ra 0.8–3.2 μm.
Certifications to ask for
- ISO 9001
- ISO 14001
- IATF 16949 (auto)
- EN 9100 (aero)
Frequently asked questions
How do I send a CNC RFQ?
Attach a 3D STEP plus a 2D PDF with critical tolerances, material spec, surface treatment and yearly volume. Mention any inspection report you need (PPAP, FAI, CoC).
When is CNC cheaper than casting or forging?
Below ~500 pcs/year or when tolerances are too tight for net-shape processes. Above 2-5k pcs/year, near-net-shape blanks plus finish CNC usually win.
Sourcing countries covered
Editorial market guide. Supplyria is a marketplace; we don't list private suppliers on this page. Cost ranges and lead times are indicative and based on public industry benchmarks.