Aerospace CNC Machining for Seattle Area Programs
Seattle area buyers can draw on a machining base built around Boeing's Everett and Renton factories, and the Kent Valley space companies increasingly do exactly that. The work goes well when the purchase order states which approvals count, because a Boeing qualified shop and a rocket startup's requirements are not the same thing.
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What "Seattle" means to an aerospace buyer
For machining, Seattle is shorthand for the Puget Sound corridor, not the city limits. The jobs come from Everett and Renton aircraft production, the Kent and Tukwila space companies south of the city, and the Redmond and Kirkland satellite plants on the Eastside.
That spread matters. A part designed in Kent, machined near Everett and finished somewhere in between can cross the region twice, and I-5 and I-405 traffic decides how long that takes. Buyers who want to witness a first article or walk a part back for rework should say where the hardware will be inspected and delivered, so the supplier choice fits the route.
The Kent Valley space cluster
Kent and its neighbors hold the region's launch and in-space companies, and they buy a steady stream of development and production parts. Kent's own space history runs back to the Boeing Space Center, where Boeing developed the Lunar Roving Vehicle for Apollo.
- Blue Origin has been in Kent since 2000. Its O'Neill Building headquarters and R&D center, 232,885 square feet on a 30.7 acre site, opened in January 2020, and a 2022 report described a further 210,000 square feet of leased warehouse space on former Boeing land near the old Space Center.
- Stoke Space was founded in Kent in 2019 by former Blue Origin engineers. It is building Nova, a fully reusable medium lift rocket, with a rocket test facility at Moses Lake in eastern Washington.
- Starfish Space, also founded by Blue Origin alumni, builds the Otter satellite servicing vehicle at its Tukwila headquarters.
Typical machined work for these programs includes combustion and turbomachinery parts in nickel superalloys, valve bodies and manifolds, structural brackets and rings, test stand plumbing hardware and ground support fixtures. Quantities are small and revisions come quickly. For alloy behavior and cost, see nickel superalloys and large part machining.
Have a part like this?Send it in under a minute. A person replies within 1 business day.How space startups use the aircraft machining base
Space companies here rarely build a supply chain from nothing. They hire shops that already hold AS9100, run five axis machines and know first article inspection from Boeing work, then teach them a different pace.
The scale of the aircraft side explains why those shops exist. Boeing describes its Everett plant as the largest manufacturing building in the world by volume. Renton builds the 737 and its wings, and in 2026 Boeing opened the North Line in Everett, its first 737 MAX final assembly line outside Renton, with Renton built wings trucked north to it. Decades of that production trained a deep bench of machinists, inspectors and finishers.
| Item | Typical aircraft production order | Typical space startup order |
|---|---|---|
| Quantity | Recurring lots on a schedule | One to a handful, often with spares |
| Design maturity | Released, rarely changed | Frequent revisions between lots |
| Process sources | Boeing D1-4426 approved processors | The buyer's own approved list or engineering approval |
| Inspection | AS9102 first article, then sampling | Often full inspection of every flight part |
| Cleanliness | General shop cleanliness | Precision or oxygen clean levels on fluid parts |
A shop that does both well is worth a lot. Say up front which column your order belongs in.
Special process approvals buyers check
Before a part goes out for anodize, plating, heat treat, passivation or NDT, confirm that the processor is approved for the exact specification on your drawing. That one check prevents most paperwork rejections at receiving.
- Boeing work. Boeing clause Q019 requires approved processors under D1-4426, "Approved Process Sources," and a certificate with each shipment naming the process specification and revision, processing dates and each processor's name and address.
- Quality system. Boeing's D6-82479 expects production suppliers to hold a 9100 certificate from an accredited registrar listed in the IAQG OASIS database. Any buyer can use OASIS to confirm a certificate is current and covers the right scope.
- Space and defense work. Your own specifications and approved source lists govern. If you will accept a processor because it is Nadcap accredited or on a prime's list, write that down, and if you will not, name the sources you require.
More detail is on our pages for aerospace special processes, heat treatment and nondestructive testing.
Sea-Tac, the ports and moving hardware
Seattle-Tacoma International Airport is the obvious way to move small, urgent parts in and out of the region. It sits in the city of SeaTac, about 14 miles south of downtown and close to the Kent Valley, and the Port of Seattle owns it.
The airport handled 460,062 metric tons of air cargo in 2024. Heavier and slower freight can use the Seattle and Tacoma marine terminals, which the two ports run jointly as the Northwest Seaport Alliance.
For machined parts, the practical advice is about handling, not routes. Flight parts with finished surfaces need packaging that survives sorting hubs, and anything outsized, such as a stand or lifting fixture, needs a crate and a carrier who will not stack it. See shipping flight hardware and receiving inspection.
Rain, condensation and finished parts
Western Washington stays damp for months at a time, which is enough to rust a steel part that sits unprotected. Plan protection for every step between the last machine operation and installation.
The National Weather Service's current normals give Seattle about 39 inches of precipitation over roughly 156 rainy days a year, with November the wettest month and summer the driest. Inside unheated warehouses and truck trailers, cold metal picks up condensation when warm damp air arrives. Shops here know this, but a buyer should still:
- Require a temporary preservative or a sealed bag with desiccant on carbon and alloy steel parts awaiting plating or assembly.
- Ask that parts waiting at an outside processor be stored indoors and bagged, not left on pallets at a dock.
- Inspect for staining on receipt, before the paperwork is signed, since corrosion found weeks later is hard to assign.
What Seattle area buyers put on the purchase order
A complete PO is the fastest way to a correct part. The items below are the ones most often missing on Seattle area orders, especially from fast moving space programs.
- Drawing number and revision, plus any model or CAD revision that controls.
- Material specification and condition, with mill certs traceable to heat or lot.
- Each special process by specification and revision, and which processor approvals you accept.
- Quality system expectation, usually AS9100, and AS9102 first article requirements.
- Cleanliness level and test method for fluid system parts.
- Preservation and packaging, including desiccant or corrosion inhibitor.
- Export classification, and a note that ITAR, EAR or CUI data moves only by secure transfer.
- Delivery point and whether you want to witness inspection.
The RFQ checklist expands on each item and AS9102 first article inspection covers the FAI forms. For controlled drawings, read our confidentiality process first. The statewide view, including Boeing flow-downs and defense bases, is on the Washington page, and the full service is at aerospace CNC machining. Spacecraft buyers may also want satellite manufacturers.
Send a Seattle machining request
Aerospace Sourcing works for buyers anywhere in the United States. We match your machining job to qualified suppliers, flow down your process approvals, inspection and packaging requirements, check the certs, and give you one quote, one lead time and one point of contact even when the part passes through several shops. A person replies within one business day, and every order ships with a certificate of conformance.
If you have a valve body, bracket or fixture for a Kent Valley, Everett or Eastside program, start a CNC request and list the process specifications you need so the right processor is lined up before the first chip is cut.
Send the job. A person replies within 1 business day.
Part, quantity and date are enough to start. Drawings and the mutual NDA follow by reply, and controlled programs never send technical data through this site.
We have it.
Reference . A person replies within 1 business day. Watch for our email from [email protected].
Questions
Can Seattle area aircraft shops machine rocket engine parts?
Many can, since five axis capability, AS9100 systems and first article experience carry over from aircraft work. Rocket engine parts often add nickel superalloys, tight cleanliness levels and full inspection of every flight part, so check the shop's experience with those materials and its access to approved processors for your specifications. Writing those requirements into the request helps the right shops quote and keeps the others from wasting your time.
How do I check that a processor is approved for my specification?
For Boeing work, check the D1-4426 Approved Process Sources listing for the exact specification and process, through your procurement contact or Boeing's supplier site. For quality system certificates, the IAQG OASIS database shows whether a 9100 certificate is current. For space and defense work, compare the processor against your own approved source list or your customer's. Ask for the processor's certificate with every shipment.
Is Sea-Tac a good option for shipping urgent flight parts?
For small, urgent parts it usually is. Seattle-Tacoma International Airport sits about 14 miles south of downtown, close to the Kent Valley, and handled 460,062 metric tons of air cargo in 2024. The bigger risk is handling, so finished flight parts need packaging that survives sorting hubs. Oversized fixtures and stands are usually better on a dedicated truck in an engineered crate.
Do I need special packaging because of Seattle's weather?
For steel parts, yes. Seattle averages about 39 inches of precipitation over roughly 156 rainy days a year, and condensation in unheated warehouses and trailers can stain bare steel within days. Ask for a temporary preservative or sealed bags with desiccant, indoor storage at outside processors, and inspect for corrosion when the parts arrive.
Can I send ITAR drawings for a Seattle program through your website?
No. Send the non-controlled details first, such as material, envelope size, quantity, finish and need date. Every supplier signs a flow-down NDA before seeing customer files, controlled data moves only by secure transfer to US persons, and suppliers do not learn who the end customer is unless you approve it. Our confidentiality page explains the steps.
Do you have a shop or office in Seattle?
No. Aerospace Sourcing serves buyers across the United States and does not run machines. We take your request, match it to qualified suppliers that fit the requirements, flow down your approvals and inspection needs, check the paperwork and deliver with a certificate of conformance. You get one quote, one lead time and one point of contact.
Related
Sources
- Blue Origin: Blue Origin opens new headquarters in Kent, Washington
- Kent Reporter: Washington State Space Summit puts Kent front and center (2023)
- Kent Reporter: Blue Origin leases warehouse space for further expansion (2022)
- Starfish Space: Starfish Space secures $29 million to advance Otter development
- Boeing: Everett production facility
- Boeing: New 737 North Line opens (2026)
- Boeing clause Q019: D1-4426 Approved Process Source, Deliverable (10/08/2024)
- Boeing: D6-82479 Rev K, Quality Management System Requirements for Suppliers
- Port of Seattle: SEA completes pandemic recovery with record 2024 volumes
- Wikipedia: Seattle-Tacoma International Airport
- Port of Seattle: The Northwest Seaport Alliance
- FOX 13 Seattle: Seattle's new climate normals, warmer and wetter
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