CNC Turning in Renton, WA
Swiss and live-tooling CNC turning for Boeing 737 MAX landing gear trunnion pins, 15-5 PH H900 hydraulic actuator bodies, Ti-3Al-2.5V APU tube fittings, and 17-4 PH flight-control clevises. ±0.0002" pin diameters. Rz ≤16 µin sealing faces. 1-Day LTL to 98057.
CNC turning for Renton, WA. RivCut supplies CNC turning to engineering and manufacturing teams across Renton and the Pacific Northwest and nearby Everett, Auburn, Kent, and Seattle. Parts are machined 100% in the USA at our Union City, California facility and reach Renton in about 3–4 business days by ground freight — with expedited air and AOG options when a production line is down.
GKN Aerospace Auburn and Boeing Fabrication Auburn feed wing and nacelle sub-assemblies into Renton — creating parallel demand for precision turning along the 737 supply chain that runs down the Duwamish corridor from Renton to Auburn. Every Renton order ships with CMM inspection, full material traceability, and a first-article report on request.
trunnion pin diameters
plated bearing surfaces
via I-5 (830 mi)
on actuator bores
What Is CNC Turning for Renton 737 MAX Programs?
CNC turning in Renton is not a generic rotary machining service — it is a narrow-body precision discipline. The Boeing Renton Factory assembles 38–42 737 MAX aircraft per month, and every landing gear trunnion pin, hydraulic actuator body, and flight-control clevis inside those aircraft starts life as a bar or billet of 4340 steel, 15-5 PH, or Ti-3Al-2.5V. Our Swiss and live-tooling lathes handle the alloys, the tolerances, and the Boeing D1-9000-1 / D6-17487 documentation workflow that Renton buyers expect on day one of an RFQ.
Narrow-Body Tolerances
We hold ±0.0002" on trunnion pin diameters and Rz ≤16 μin on hydraulic sealing faces — the tolerances 737 MAX landing gear demands.
737 MAX Turning Alloys
4340/4130 steel, 15-5 PH H900, 17-4 PH, Ti-3Al-2.5V (Grade 9), and 6061-T6 stocked per MMPDS-2024 with EN 10204 3.1 mill certs.
Boeing D6-17487 Workflow
We read Boeing-native MBD models and deliver CMM reports tied to the same model your engineer released. D1-9000-1 documentation on every lot.
737 MAX Narrow-Body Turning Part Types
The signature turned parts that keep the Boeing Renton Factory's narrow-body line moving.
In Renton, Boeing's 38–42-aircraft-per-month 737 MAX assembly rate drives steady demand for precision turning. Landing gear trunnion pins, flight-control clevises, APU tube fittings, and actuator bodies are consumed at high rates by the Boeing Renton Factory, Safran Landing Systems (Kent), and Exotic Metals Forming (1625 E Valley Rd, Renton) — all within 5 miles of the 737 Logan Ave N final assembly building.
GKN Aerospace Auburn and Boeing Fabrication Auburn feed wing and nacelle sub-assemblies into Renton — creating parallel demand for precision turning along the 737 supply chain that runs down the Duwamish corridor from Renton to Auburn.
4340 Steel Landing Gear Trunnion Pins
Main and nose landing gear trunnion pins in AMS 6414 (4340 HT). Turned to ±0.0002" on pin diameters. Heat treatment to Rc 54–58 coordinated with NADCAP-approved processor. MIL-DTL-5541 corrosion protection where required.
4340 Steel · Rc 54-5815-5 PH H900 Hydraulic Actuator Bodies
Flight-control and landing gear hydraulic actuator cylinders in 15-5 PH H900 (AMS 5659). Bore diameters to ±0.0005". Sealing faces to Rz ≤16 μin. Full heat-lot traceability and AS9102 FAIR on first articles.
15-5 PH H900 · AMS 5659Ti-3Al-2.5V APU Tube Fittings
Thin-wall tube fittings and union joints for the 737 MAX APU and hydraulic systems in Ti-3Al-2.5V (Grade 9, AMS 4943). Wall thickness down to 0.040". Orbital-weld prep and flare-fitting geometry per Boeing plumbing standards.
Ti-3Al-2.5V · AMS 494317-4 PH Flight Control Clevises
Primary flight control rod-end clevises in 17-4 PH H900 (≈190 ksi UTS). Bore and clevis-pin holes to ±0.0003". Perpendicularity held for control-rod pin loading. MIL-A-8625 Type II anodize coordinated where applicable.
17-4 PH H900 · ~190 ksi UTS4130N Drag-Brace Clevis Pins
Nose landing gear drag-brace clevis pins in 4130N normalized. Shank diameter to ±0.0002". Lug and head geometry held for drop-in assembly to Boeing NLG installation. Hard chrome plating coordinated for wear surfaces.
4130N · Hard Chrome6061-T6 Overhead Bin Track Extrusion Profiles
Interior overhead bin track and seat-track extrusion profiles in 6061-T6. Swiss-turned fastener inserts, track-end caps, and stop fittings. MIL-A-8625 Type II anodize standard. Volume production at 737-rate cadence.
6061-T6 · MIL-A-8625
737 MAX MLG Trunnion Pin — 4340 Steel
Turned as a first-article main landing gear trunnion pin for a 737 MAX -8 overhaul program. Delivered to 98057 in 7 business days with a full Boeing D1-9000-1 package and CMM output tied back to the engineer's release model.
on bearing journal
per drawing callout
Renton receiving dock
corrosion protection
- CMM report per Boeing D1-9000-1 AQS documentation requirements
- AMS 6414 (4340 HT) heat-lot traceability to MMPDS-2024
- AS9102 Rev C first article inspection (FAIR) package
- NDA-protected project files — ITAR-compliant handling available
Tolerances. Alloys. Documentation.
Three 737 MAX turning constraints, baked into every Renton CNC turning order.
5-Axis Swiss & Live-Tooling Turning
Narrow-body precision on a single turning center setup.
- ±0.0002" pin diameter capability
- Rz ≤16 μin sealing faces
- Swiss and live-tooling on one floor
- Sub-spindle complete-turn in one setup
Verified Quality — CMM
Every narrow-body turned part is CMM verified before it leaves the floor.
- CMM output tied to MBD release model
- NIST-traceable calibrated gauges
- AS9102 Rev C FAI package included
- MMPDS-2024 material allowables
Boeing 737 Documentation Stack
Renton buyers expect this on day one of an RFQ.
- AS9100D quality management
- Boeing D1-9000-1, D6-82479
- D6-17487 narrow-body process spec
- NADCAP heat-treat/plating via approved processors
From CAD File to Boeing Renton in Days
Three steps. 737 MBD fluent. Built for Renton narrow-body program cadence.
Upload CAD or 737 MBD Release
Send a STEP, IGES, or Boeing 737-compatible MBD file. Specify alloy, heat treatment, sealing-face finish, and any NADCAP-processed plating. We review against D6-17487 rules and respond fast.
We Swiss-Turn & CMM Verify
Your trunnion pin, actuator body, or tube fitting runs on our Swiss and live-tooling lathes. CMM output ties back to your MBD release model. AS9102 FAIR on first articles.
Ship to Boeing Renton Receiving
LTL via I-5 reaches 98057 in 1 day from Union City, CA. Schedule-at-risk? SFO to BFI same-day via Alaska Air Cargo. First article, CMM, and material cert ship with every lot.
Why Renton, WA Companies Choose RivCut for CNC Turning
Renton (pop. ~106k, King County) is the assembly home of the Boeing 737 MAX at 737 Logan Ave N (98057). At 38–42 aircraft per month, the 737 MAX is the highest-production commercial jetliner in history. Local suppliers Exotic Metals Forming, Safran Landing Systems (Kent), and GKN Aerospace (Auburn) depend on precision turning of landing gear hardware, actuator bodies, and tube fittings at high-rate cadence. RivCut machines parts from our Union City, CA facility — 1-day LTL via I-5, with Alaska Air Cargo same-day SFO to BFI when schedule is at risk.
All parts are CNC machined in-house at our Bay Area shop. We never broker or outsource. Learn about RivCut →
Common Questions About CNC Turning in Renton
CNC Turning Materials Available for Renton, WA
4340 steel (AMS 6414), 4130N, 15-5 PH H900 (AMS 5659), 17-4 PH H900, Ti-3Al-2.5V (Grade 9 AMS 4943), Ti-6Al-4V AMS 4928. 6061-T6, 7075-T6511. Every heat lot ships with MMPDS-2024 material certification.
| Alloy Steel (Landing Gear & Structural) | |
|---|---|
| 4340 HT (AMS 6414) | Landing gear trunnion pins, Rc 54-58 |
| 4130N Normalized | Drag-brace clevis pins, weldable airframe steel |
| Stainless Steel (Actuators & Flight Controls) | |
| 15-5 PH H900 (AMS 5659) | Hydraulic actuator bodies, sealing-face parts |
| 17-4 PH H900 | Flight control clevises, ≈190 ksi UTS |
| Titanium | |
| Ti-3Al-2.5V Gr 9 (AMS 4943) | APU tube fittings, thin-wall hydraulic tubing |
| Ti-6Al-4V Gr 5 (AMS 4928) | Pylon and nacelle turned fittings |
| Aluminum | |
| 6061-T6 | Overhead bin track inserts, interior fittings |
| 7075-T6511 | High-strength structural turned parts |
Don’t see your grade? Ask us — we turn 50+ aerospace alloys.
CNC Turning Near Renton
Built for Boeing Renton Factory's Narrow-Body Turning Demand
Renton's turning demand is sized by the 737 MAX assembly rate, not by generic job-shop parts. A 737 MAX main landing gear trunnion pin is turned from 4340 HT bar to ±0.0002 inch on pin diameters — a tolerance class that requires Swiss-style precision and process control that most job shops can't guarantee on steel above Rc 50. The Boeing Renton Factory absorbs 400,000+ parts per aircraft, and a significant fraction are rotationally symmetric: landing gear trunnion pins, drag-brace clevis pins, hydraulic actuator bores, APU tube union fittings. All of them go into Safran Landing Systems (Kent, 12 miles south), Exotic Metals Forming (1625 E Valley Rd, right-bank of the Cedar River), and Boeing Fabrication Auburn before they reach the 737 Logan Ave N flight line. The 15-5 PH H900 actuator body that controls a 737 MAX spoiler sees 3,000 psi hydraulic pressure every flight cycle — the sealing face must be Rz ≤16 µin or the aircraft doesn't fly. That is why Renton CNC turning is a Swiss-tolerance, heat-treat-coordinated, AS9100D discipline. RivCut turns into that demand from Union City, CA with 1-day LTL via I-5, Boeing D1-9000-1 documentation on every lot, and NADCAP heat-treat coordination built into the quote.
Upload Your CNC Turning CAD File for Renton
Landing gear trunnion pins. Hydraulic actuator bodies. APU tube fittings. Flight-control clevises. Quote in hours.
No minimums · AS9100D · Boeing D1-9000-1 · D6-17487 · Ships to 98057 next day