US Manufacturing
What Should Be on a CNC Machining Capability Page
Kalk Solutions Editorial
TL;DR
A CNC capability page should let an engineer or buyer confirm fit without calling: machine types and axis counts, envelope sizes, achievable tolerance bands, materials machined, inspection and metrology capability, certifications, typical lot sizes, and standard lead times. Missing any of these forces a phone call, and many buyers won't make it.
Quick answers
- What is the most commonly missing item on CNC capability pages?
- Tolerance bands. Most pages say 'precision machining' without stating the actual achievable tolerance in inches or microns, which is one of the first things a buyer checks.
- Should machine models and axis counts be listed?
- Yes. Listing 3-axis, 4-axis, and 5-axis mills plus Swiss and multi-axis lathes with brand and count lets engineers judge complexity and capacity at a glance.
- How specific should material lists be?
- Specific alloys, not categories. List 6061-T6 and 7075 aluminum, 17-4 PH and 316 stainless, titanium grades, and engineering plastics, not just 'metals and plastics'.
- Do lot sizes need to be stated?
- Yes. State whether the shop runs prototype single-piece jobs, low-volume production, or high-volume runs, since this filters out mismatched inquiries before they hit your RFQ form.
- Should certifications be listed with numbers?
- Yes, where applicable. AS9100, ISO 9001, ITAR registration, and IATF 16949 should show certificate numbers or registration status, not just badge logos.
A capability page has one job: let an engineer or buyer confirm, without picking up the phone, whether your shop can make their part. Most CNC capability pages fail this test because they read like marketing copy ("state of the art precision machining") instead of a spec sheet an engineer can actually use.
The 8-part checklist
Atomic answer: a complete CNC capability page covers machine types and axes, envelope sizes, tolerance bands, materials, inspection, certifications, lot sizes, and lead times. Each missing item is a reason for the buyer to click away instead of submitting an RFQ.
| # | Item | Example detail |
|---|---|---|
| 1 | Machine types and axes | 3-axis, 4-axis, 5-axis mills; Swiss-type and multi-axis lathes |
| 2 | Envelope sizes | 12 in x 20 in x 16 in max travel, down to sub-inch parts |
| 3 | Tolerance bands | +/- 0.0005 in. standard, tighter per print |
| 4 | Materials | 6061-T6, 7075 aluminum, 17-4 PH, 316 stainless, Ti-6Al-4V, Delrin, PEEK |
| 5 | Inspection | CMM, optical comparator, surface plate, first article inspection |
| 6 | Certifications | AS9100D, ISO 9001:2015, ITAR registered |
| 7 | Lot sizes | Prototype (1 to 25), low-volume production (25 to 5,000), high-volume runs |
| 8 | Lead times | Standard 2 to 4 weeks, expedite options noted |
1. Machine types and axis counts
List actual equipment: number of 3-axis vertical mills, 5-axis simultaneous mills, Swiss-type lathes, and live-tool turning centers. Axis count tells an engineer how complex a geometry you can run in one setup, which affects both cost and lead time for their part.
2. Work envelope sizes
State your largest and smallest envelope. A shop that only lists "large parts capability" without dimensions forces the buyer to guess whether their 30 inch housing or their 0.25 inch precision pin fits your equipment.
3. Tolerance bands, stated honestly
"Precision machining" means nothing without a number. State your standard achievable tolerance and note that tighter call-outs are quoted per print rather than guaranteed across the board. Overstating tolerance capability creates quality escapes and rejected first articles later, which costs more than the lost inquiry from being precise upfront.
4. Materials, named specifically
List actual alloys and grades, not categories. "Metals and plastics" tells an engineer nothing; "6061-T6 and 7075 aluminum, 17-4 PH and 316 stainless, Ti-6Al-4V, Delrin, PEEK" lets them confirm fit against their bill of materials in seconds.
5. Inspection and metrology
Name your CMM brand and probing type if it is a differentiator, optical comparators, height gauges, surface plate capability, and whether you run first article inspection reports or PPAP documentation. Medical and aerospace buyers specifically look for this before submitting a print.
6. Certifications with real detail
List AS9100D, ISO 9001:2015, ITAR registration, or IATF 16949 with registration or certificate status, not just a badge graphic. For certification body guidance, see the relevant ISO or IATF issuing body pages directly rather than relying on a badge alone.
7. Typical lot sizes
State whether you run prototype single-piece jobs, low-volume production runs, or high-volume contracts. This single line filters out a large share of mismatched RFQs before they ever reach your form, saving your team time on quotes that were never going to close.
8. Standard lead times
Give a real range, such as "2 to 4 weeks standard, expedite available," rather than "fast turnaround." Buyers comparing suppliers use stated lead time as a tie-breaker when capability and price are close.
Industries served: the ninth item worth adding
While not strictly a machining spec, naming the industries you actually serve (aerospace, medical device, defense, industrial automation) helps buyers self-qualify and improves how well AI search tools and Google understand what your shop does, covered in AI search visibility for US manufacturers.
How this page fits into the RFQ path
A strong capability page still needs a short path to a quote. Once a buyer confirms fit here, the next click should be your RFQ form, not a generic "contact us" link. See how to design an RFQ form buyers actually complete and the full site framework in how to build an RFQ-ready manufacturing website. For a broader treatment of capability pages across processes beyond CNC, see manufacturing capability pages RFQ guide.
Get an outside read on your capability pages
Most shops are missing two or three items from this list without realizing it. Run my free Buyer Reach Audit to see what your pages are missing, or book a 30 minute manufacturing growth audit to review it with our team.
60-second live scan
See where your buyers are searching - right now.
Run your buyer-intent keywords through live Google. Get a competitor map and ranking gaps in 60 seconds. Free, no pitch.
Run my free Buyer Reach AuditPrefer a working session?
Book a 30-min call with our team.
No pitch. Walk away with a written action plan - whether you hire us or not.
Book a strategy callFor US manufacturers
Tired of ThomasNet junk leads?
Run a free 60-second audit of where your buyers are searching in the US. Get a real diagnosis — no pitch.
Questions about this topic
Do I need a separate page for each machining process?
It depends on scope. Shops with distinct milling and turning capabilities often benefit from separate pages so each can go deeper on relevant specs, then link to each other.
How do I present tolerance without misleading buyers?
State your standard achievable tolerance (for example +/- 0.0005 in.) and note that tighter tolerances are quoted per print, rather than implying every job hits your tightest number.
Should I list envelope sizes for every machine?
At minimum, list your largest and smallest work envelope so buyers can rule the shop in or out for oversized or small precision parts without asking.
What inspection equipment should be mentioned?
CMM (with brand and probing type if notable), optical comparators, height gauges, surface plate inspection, and any first article inspection or PPAP process you run.
How does industries served affect the page?
Naming the industries you actually serve (aerospace, medical, defense, industrial equipment) helps buyers self-qualify and improves relevance for search and AI answer engines.
Related field guides