CNC Parts Assembly Services
Mechanical sub-assemblies for complex, high-value components in difficult alloys
AXALLOY Precision is a Shenzhen-based CNC machining partner focused on complex parts and sub-assemblies made from difficult-to-machine alloys. We support international engineering, procurement and quality teams from prototype development through low-volume and repeat production.
Difficult Alloy Expertise
Specialty in Inconel, Hastelloy, titanium, PH stainless, duplex, cobalt alloys and selected specialty metals.
Prototype to Production
From 1-off engineering builds through controlled repeat batches with consistent process control.
Documented Quality
Material traceability, FAIs, dimensional reports and project-specific records on every order.
Proactive Communication
DFM/DFA feedback, process planning and dependable updates throughout your project.
Where AXALLOY Fits Best
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Complex geometry, thin walls, critical interfaces and tight assembly stack-ups
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High-value prototypes, low-volume or high-mix programs, and repeat production
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Projects requiring material certification, first article inspection and traceability
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Teams that value manufacturability, process control and communication over lowest unit price
Industries Served
Aerospace, medical devices, semiconductor equipment, energy, oil and gas, marine, robotics, automation and precision industrial equipment.
Global Markets
North America, Europe, the UK, Australia, New Zealand and advanced manufacturing markets in Asia.
What We Assemble
Mechanical sub-assemblies and kitted sets that integrate precision-machined parts with standard hardware and verified fits.
Sub-Assembly Types
- -Valve bodies, nozzles, manifolds and fluid-handling sub-assemblies
- -Precision housings and brackets with bushings, bearings and alignment pins
- -Rotational sub-assemblies: shafts, sleeves, couplings and threaded components
- -Thin-wall and multi-component structures with controlled GD&T stack-ups
- -Sealing features: O-rings, gaskets, surface finishes and flatness-controlled interfaces
- -Kitting: matched and serialized parts packaged by BOM, lot and work order
Typical Assembly Operations
- -Threaded fasteners, helicoils and inserts (metric/imperial)
- -Press-fits, slip/interference fits and bearing/bushing installation
- -O-ring and seal installation per drawing and spec
- -Marking, part identification and serialization
- -Cleaning, passivation and coating per specification
- -Final fit checks, torque checks, functional feel checks and documentation
Note: We assemble per customer documentation and specifications. Any adhesives, lubricants or locking compounds are applied when defined in the BOM or drawing.
Core Machining + Assembly Capability
Our in-house precision manufacturing supports the full mechanical assembly process.
Multi-Axis Milling
- 3-axis, 4-axis and 5-axis machining
- Max 3-axis: 1,000 x 600 x 600 mm
- Max 5-axis: 500 x 400 mm
- Positioning accuracy: ±0.005 mm
- Milling tolerance down to ±0.005 mm
CNC Turning & Mill-Turn
- Max turning: 500 x 1,000 mm
- Mill-turn up to 400 x 800 mm
- Typical tolerance: ±0.005-0.008 mm
- Roundness down to 0.005 mm
Swiss CNC Turning
- Diameter range: 0.5-32 mm
- Repeatability: ±0.003 mm
- Threads down to M0.8
- For small precision components
EDM Services
- Wire and sinker EDM
- Cutting accuracy down to ±0.005 mm
- Internal corner radii to R0.05 mm (sinker)
- For sharp internal features and hard alloys
Precision Grinding
- Surface, cylindrical and centerless
- Grinding tolerance down to ±0.002 mm
- Flatness to 0.003 mm
- Surface finish Ra down to 0.2 m
Special Processes
- Heat treatment
- Passivation and coating
- Deburring, cleaning and marking
- Complete finishing solutions
Assembly-Critical Geometric Controls
We routinely support demanding tolerances that ensure proper fit and function in complex assemblies.
±0.005 mm
Dimensional tolerances
0.010 mm
Position tolerance
0.005 mm
Flatness capability
0.008 mm
Concentricity
Surface Finish Capabilities
Materials We Handle
We focus on difficult alloys and specialty metals where controlled machining and assembly practices matter.
Nickel Alloys
Inconel 625/718/725, Hastelloy C-22/C-276, Monel 400/K-500, Haynes 188/230/282, Waspaloy, Nimonic, Rene
Titanium
Grades 2, 5, 9, 12 and 23
Stainless Steels
316L, 321, 410, 420, 440C, 15-5 PH, 17-4 PH
Duplex & Super Duplex
2205 and 2507
Cobalt Alloys
Stellite, L605, MP35N
High-Temperature Steels
A286, Nitronic 50/60
Specialty Metals
Nitinol, molybdenum, tungsten and copper-nickel alloys
Tool Steels
A2, D2, H13, M2
Our approach evaluates material behavior, geometry, tolerances, surfaces, inspection strategy and quantities before defining machining and assembly processes.
Inspection and Quality Assurance
CMM Measurement
700 x 1,000 x 600 mm; accuracy up to 1.8 + L/300 m
Optical Measurement
Accuracy: ±0.002 mm
Thread Inspection
Gauges and optical measurement
Surface Roughness
Ra 0.05-40 m
Hardness Testing
Rockwell, Brinell and Vickers
Controlled Environment
Temperature-controlled inspection room with calibrated equipment
Quality Documentation
- -Material test reports and mill certificates
- -Certificates of Conformance
- -First Article Inspection reports and ballooned drawings
- -Full dimensional inspection reports
- -Surface roughness and hardness reports
- -Heat treatment and coating certificates
- -Material and lot traceability
- -Special process records and inspection photos (upon request)
- -Custom documentation to project needs (upon request)
Process and Controls
A structured approach from drawing review through clean and pack.
Drawing & BOM Review
DFA/DFM feedback on tolerances, thread specs, fits, surface finishes and special processes.
Fixture & Process Planning
Alignment, clamping, sequence and inspection strategy for stack-ups.
Prototype Through Pilot
Validate assembly sequence and critical-to-quality features.
In-Process Inspection
Gauge checks for press-fits, torque checks and fit/function verification.
Final Inspection
Dimensional verification, surface finish checks, marking and documentation.
Clean & Pack
Cleaning and protection per spec; export-ready packaging with identification and traceability.
Lead Times and Volumes
Prototype: 5-10 business days | Standard: 10-20 business days | Expedited: Available
Who We Work With
Engineering Teams
Mechanical, design and manufacturing engineers seeking stable, manufacturable assembly routes.
Procurement
Sourcing and commodity managers evaluating capability, responsiveness and supply risk.
Quality Teams
SQEs and quality managers requiring inspection evidence and controlled documentation.
Note: We are not an ideal fit for purely commodity parts purchased on lowest price or projects with incomplete technical requirements.
RFQ Checklist for CNC Parts Assembly
To quote effectively and plan a robust assembly process, please share:
- 2D drawings (assemblies and components) and 3D models
- BOM with item-level specs, preferred suppliers and any customer-supplied items
- Defined materials and certifications required
- Critical features and GD&T, surface finishes, threads and fits
- Special processes (heat treatment, passivation, coating) and acceptance criteria
- Inspection scope (FAI, dimensional report, custom plans)
- Quantities (prototype, pilot, production) and target dates
- Packaging, labeling and shipment requirements
Supported File Formats
3D CAD
STEP/STP, IGES/IGS, X_T/X_B, SLDPRT, SAT
2D Drawings
PDF, DWG, DXF
Images
JPG, PNG, TIFF
Compressed
ZIP, RAR
Frequently Asked Questions
Do you source standard hardware for assemblies?
Yes. We can procure standard fasteners, inserts and seals per your BOM, or assemble customer-supplied hardware. Lot and material traceability are maintained as required.
Can you install helicoils and threaded inserts?
Yes. We install helicoils and solid inserts per callouts, with documented torque/installation parameters when specified.
How do you control fits and stack-ups?
We plan machining and inspection around GD&T, verify critical bores and features with CMM/optical methods and use in-process gauges for press and slip fits.
What cleanliness levels can you support?
We provide cleaning per drawing/spec and deliver protected, export-ready packaging. If specific cleanliness or handling requirements are needed, please include them in the RFQ.
Can you provide FAIs and full dimensional reports?
Yes. We provide FAIs, ballooned drawings and full dimensional reports when specified.
Start Your Project
Discuss your CNC parts assembly needs with AXALLOY Precision. We'll review drawings and BOMs, provide manufacturability feedback and propose a controlled process from machining through assembly and inspection.
- -Email your RFQ with drawings and BOMs
- -Include required documentation and target dates
- -We respond with capability confirmation, questions and a detailed quotation
AXALLOY Precision
CNC machining and mechanical assembly for difficult alloys, from prototype to controlled repeat production.