What Aerospace CNC Machining Costs, and Why

The short answer

There is no honest per-part or per-hour price that fits aerospace machining in general. Two brackets that look alike can differ in price several times over because one calls out a tighter profile tolerance, a Nadcap anodize, a full AS9102 first article and material traced to the mill, and the other does not.

What a buyer can control is the set of inputs that drive the number. This guide walks through each one with plain examples, gives the few public figures that are worth knowing, and shows where buyers usually overpay without getting anything for it.

How a shop builds a machining quote

Most shops price a job the same way: one-time costs, plus per-part costs, plus outside costs, plus margin. Knowing that structure explains most of the surprises buyers see.

• One-time costs: reviewing the drawing, CAM programming, fixture design or soft jaws, tool setup, and first-piece inspection. These do not change much whether you order 2 parts or 200.
• Per-part costs: material, machine cycle time, deburring and handling, and in-process inspection.
• Outside costs: anodize, plating, passivation, heat treat, NDT, and marking, usually priced per lot with a minimum charge.
• Quality and paperwork: FAI reports, CMM programs, certificate packages, and the time a quality person spends checking them.

A worked example shows why quantity matters so much. Say an aluminum housing needs several hours of programming and fixturing before the first good part. On an order of 4, every part carries a quarter of that setup. On an order of 100, each part carries one percent of it. The cycle time per part is the same in both cases, but the unit price can look completely different. When a quote at 4 pieces seems high, the setup line is usually why.

Material: alloy, form, and certification

Material is often the easiest cost to see and the hardest to cut, because the alloy is usually fixed by the design. What you can influence is how much material gets bought and what paperwork comes with it.

• Alloy and hardness. Aluminum alloys cut quickly. Stainless steels, titanium, and nickel alloys such as Inconel cut slowly, wear tools fast, and cost more per pound, so they raise both the material line and the machine time.
• Stock form and buy-to-fly. A part hogged out of a thick plate turns most of the purchased metal into chips. A near-net forging or a smaller bar size can cut both material and cycle time. Ask your supplier what stock size they plan to use.
• Specification and certs. Material bought to an AMS or ASTM spec with mill test reports and heat lot traceability costs more than generic stock, and it should. If your drawing requires it, say so in the RFQ so every quote includes it.
• Specialty metals rules. For DoD work, DFARS 252.225-7009 restricts certain specialty metals, including titanium, many alloy steels, and nickel and cobalt alloys above set alloy content, to material melted or produced in the United States or a qualifying country. Domestic-melt material can narrow sources and add lead time.

Metal prices also move. On the Producer Price Index published by the Bureau of Labor Statistics and charted by the St. Louis Fed (FRED), the index for other aluminum rolling, drawing, and extruding rose about 31 percent between August 2025 and August 2026, and the iron and steel commodity index rose about 18 percent over the same months. Recent months are preliminary and can be revised. A quote that held for months last year may not hold now, which is one reason shops shorten quote validity periods when metal markets move.

Setup, programming, and quantity

Setup is the cost buyers most often underestimate. Every new part needs a program, a work-holding plan, tools pulled and measured, and a first piece proven out before production runs.

Parts that need several setups cost more than parts finished in one or two. A part with features on six faces may need six fixturings on a 3-axis mill, or fewer on a 5-axis machine whose hourly cost is higher. Neither is always cheaper. It depends on the geometry and the quantity.

Buying in realistic lots helps. If you know you will need 40 parts this year, quoting 10 and 40 side by side shows exactly what the setup is costing you. Some buyers place a blanket order with scheduled releases to get the lot price without carrying all the inventory at once.

Tolerances, features, and geometry

Tolerances set how slowly a shop has to cut, how often it has to measure, and how many parts it scraps. Tight tolerances are fine where the function needs them. Applied by default to every feature, they quietly raise the price of everything.

• Tight positional or profile tolerances may require finishing passes, temperature-stable conditions, and CMM verification.
• Thin walls and deep pockets deflect and chatter, so they are cut slowly and sometimes in stages with stress relief between.
• Small internal radii force small cutters, which remove material slowly.
• Fine surface finishes may add polishing, honing, or grinding.
• Threads and inserts to aerospace specs add operations and gauging.

Here is a qualitative example. A mounting plate with a general block tolerance that is tighter than the function needs forces the shop to inspect every hole on a CMM. Opening the non-critical features to the default title block tolerance, while keeping the bolt pattern tight, can remove a full inspection program from the quote. Talk to your design engineer before you send the RFQ, not after the price comes back.

Finishing and special processes

Finishing usually happens at a separate process house, so it brings its own lot charges, lead time, and freight. On small orders, the minimum lot charge for anodize or passivation can be larger than the per-part machining cost.

When the drawing or the customer flow-down requires a Nadcap-accredited source or a customer-approved processor, the field of eligible shops gets smaller and prices follow. Masking for selective finishes, chemical film touch-up after drilling, and part marking after finish all add labor. Each extra step also adds a handoff that has to be documented in the cert package.

Grouping finishes across part numbers, standardizing on one finish spec where the design allows it, and asking whether masking is truly needed are the usual ways to bring this line down.

Inspection, FAI, and certification paperwork

Quality costs are real labor, not overhead you can negotiate away. A full AS9102 first article inspection means measuring and recording every design characteristic on the drawing, including notes, plus documenting the material and special processes. On a complex part, that can take longer than machining the part. See our first article inspection guide for what that involves.

Other paperwork adds time as well: certificates of conformance, material certs, process certs, serialization, and any customer-specific forms. None of it is optional when your contract requires it, but buyers sometimes ask for more than the contract needs, such as a full FAI on a part that already has a valid one, or 100 percent CMM inspection on a non-critical bracket. Matching the inspection level to the real requirement is one of the cleanest savings available.

Lead time and expedites

A rush order costs more because it displaces other work. The shop may need to run overtime, break into a running setup, pay for expedited outside processing, or buy material at whatever price is available today.

Lead time is often driven less by machining than by everything around it: material availability, the finishing queue, and inspection. If your need date is firm, tell the supplier which step is the constraint and whether partial shipments help. A realistic need date, stated early, usually buys a better price than a negotiation after the fact.

Low-cost versus high-cost drivers at a glance

Public numbers worth knowing

A few figures from government sources help explain pricing, though none of them is a shop rate.

• Machinist pay. The Bureau of Labor Statistics reports a median annual wage for machinists of $58,750 in May 2025. By industry, the median was $61,920 in transportation equipment manufacturing, $59,590 in machinery manufacturing, and $54,910 in fabricated metal product manufacturing. Wages are only one part of an hourly shop rate, which also has to cover machines, tooling, software, floor space, quality staff, and profit.
• Machine shop prices overall. The BLS Producer Price Index for machine shops, as charted on FRED, rose about 3 percent from August 2025 to August 2026. That is much less than the jump in metal indexes over the same months, which tells you material, not shop labor, has been the faster-moving part of recent quotes.

We did not find a neutral, published survey of aerospace machine shop hourly rates. Online pricing guides exist, mostly from companies that sell machining, and their ranges disagree widely. Treat any single hourly figure with caution and compare real quotes on the same RFQ instead.

Ways to lower cost without lowering quality

1. Send a complete RFQ the first time. Missing revs, specs, or cert requirements cause padded quotes and change orders later. Use our aerospace RFQ checklist.
2. Quote two or three quantities so you can see what setup is costing you.
3. Ask the shop which features drive the price. A good supplier will tell you.
4. Relax non-critical tolerances with your engineer's sign-off.
5. Combine part numbers that share material and finish into one release.
6. Match FAI and inspection to what the contract actually requires.
7. Give a real need date early instead of paying to expedite late.

Get a machining quote built on your real requirements

Send us your drawing package and requirements through the CNC machining quote form. A person replies within 1 business day. We flow your certs, FAI, material traceability, and special process requirements down to the shop, so the price you see already includes them, and you get one quote, one lead time, and one purchase order even if several shops touch the part. We do not promise a price before we see the drawing. Files with export-controlled data never go through the website; see our confidentiality and export control page. For more on the service itself, see aerospace CNC machining.

Questions

Related

• Aerospace CNC Machining for Space and Defense Buyers
• Aerospace RFQ Checklist for Machined and Fabricated Parts
• AS9102 First Article Inspection: A Buyer's Guide
• Online Marketplace, Local Shop, or Sourcing Partner: Which Fits Your Part?

Sources

• U.S. Bureau of Labor Statistics, Occupational Outlook Handbook: Machinists and Tool and Die Makers (pay, May 2025)
• FRED, St. Louis Fed: Producer Price Index by Industry, Machine Shops (PCU332710332710)
• FRED, St. Louis Fed: PPI by Industry, Other Aluminum Rolling, Drawing, and Extruding (PCU331318331318)
• FRED, St. Louis Fed: PPI by Commodity, Metals and Metal Products, Iron and Steel (WPU101)
• Acquisition.gov, DFARS 252.225-7009 Restriction on Acquisition of Certain Articles Containing Specialty Metals
• SAE International, AS9102C Aerospace First Article Inspection Requirement