We provide on-demand custom CNC machining services, covering turning, milling, EDM, wire-cutting and other processes. We produce precision metal and plastic parts from prototype to mass production.
High-precision 3/4/5-axis CNC milling for custom metal & plastic components, from rapid prototyping to mass production.
We provide professional CNC milling services to produce complex, tight-tolerance custom machined parts. Equipped with advanced milling machines and strict quality inspection systems, we deliver durable, high-precision components for industrial, medical, automation and aerospace industries.
Choose the machining route
Complex surfaces, angled features, deep cavities and multi-face precision relationships.
TOLStrict tolerance control down to ±0.005mm
FINIn-house surface finishing to ensure consistent appearance & performance
Multi-axis capability map
3 AXIS
Available route
4 AXIS
Available route
5 AXIS
Available route
Milling Axis
3/4/5 Axis
Tolerance Range
±0.005mm ~ ±0.05mm
Max Processing Size
1200*800*600mm
Surface Roughness
Ra 0.8μm – Ra 3.2μm
File Format
STEP, IGES, STL, DXF, DWG
Lead Time
3–5 days for prototypes, 10–15 days for mass production
Machining sample / selection reference
Light metals
Selecting the right material is critical for part performance, cost, and durability. We provide a comprehensive library of plastics and metals, each verified for consistent quality. Our team offers expert guidance to match your design requirements with the ideal material, ensuring optimal strength, finish, and performance in the final application.
At ZHD Precision, we provide a full range of CNC milling surface finishes that enhance both functionality and appearance, improving durability, resistance to corrosion, and aesthetics as part of our comprehensive CNC machining process.
Selected finish
Anodizing
Finish decision
A dedicated electrochemical oxidation process for aluminum parts. Classified into standard and hard anodizing, it forms a dense protective oxide film to enhance surface corrosion resistance and wear resistance.
Tightest custom capability
±0.005mm
Metals
ISO 2768-m
Plastics
ISO 2768-c
CNC milling tolerances define how precisely part dimensions are controlled during machining.
Our precision CNC milling services follow ISO 2768-m for metals and ISO 2768-c for plastics, delivering stable, repeatable dimensional accuracy across 3-axis, 4-axis, and 5-axis CNC milling.
3-axis
±0.02–±0.05mm
Simple flat and prismatic parts
4-axis
±0.015–±0.03mm
Indexed rotational and side features
5-axis
±0.008–±0.02mm
Complex angled and multi-face relationships
Component family index
Selected component
Equipment shells, enclosures, fixture parts
Process selection is reviewed around geometry, datum relationships, surface condition and the final assembly interface.
Chapter 1
Walls & internal geometry
Chapter 2
Cavities & drilled features
Chapter 3
Tool access & special features
Chapter 4
Finishing & complex surfaces
WallInternal radius
Design chapter 1
1.5–3.0mm aluminum / 2.0–4.0mm steel
Maintain uniform wall thickness at 1.5–3.0 mm for aluminum parts and 2.0–4.0 mm for steel parts to avoid deformation and machining instability.
R0.8–R1.5 minimum fillet
Avoid sharp internal corners; use minimum fillet radius ≥ R0.8–R1.5 to match standard end mill tools and reduce tool wear.
Cavity ratioHole depth
Design chapter 2
Maximum recommended 3:1 depth-to-width
Limit deep and narrow cavities; keep the depth-to-width ratio no more than 3:1 to prevent tool deflection, vibration and poor surface finish.
Standard drilling within 5:1 depth-to-diameter
Design hole depth with depth-to-diameter ratio within 5:1 for standard drilling; deeper holes require step drilling or special tooling.
Slot widthUndercut access
Design chapter 3
Minimum feature or slot width 1.0mm
Keep minimum feature width and slot width ≥ 1.0 mm, compatible with standard 1mm–6mm CNC cutting tools for stable machining.
Reduce undercuts deeper than 5mm
Reduce unnecessary undercut features deeper than 5 mm to avoid extra 4-axis or 5-axis processing and extra production cost.
Finish allowanceCurved geometry
Design chapter 4
Reserve 0.05–0.15mm for finishing
Reserve surface treatment allowance of 0.05–0.15 mm for anodizing, plating and powder coating to guarantee final dimension tolerance.
Simplify radii smaller than R3 where possible
Simplify complex curved structures with radius smaller than R3 where possible to lower processing difficulty, cost and lead time.
Share the CAD model before release so wall thickness, radii, tool reach, finishing allowance and datum strategy can be reviewed together.
Request a Milling DFM ReviewA controlled production workflow for Precision CNC Milling Services | Custom CNC Milled Parts Manufacturer, from engineering review and task preparation to final inspection and delivery.
Gate 01
Confirm the Precision CNC Milling Services | Custom CNC Milled Parts Manufacturer requirements, review drawings, prepare inspection tools and arrange the required materials before production starts.
Gate 02
Create and verify a qualified master sample for Precision CNC Milling Services | Custom CNC Milled Parts Manufacturer. Mass-produced parts are manufactured and inspected against the approved sample standard.
Gate 03
Technicians and operators verify the first article, then QC confirms dimensions, appearance and key requirements before batch production continues.
Gate 04
Operators and QC staff perform regular checks during Precision CNC Milling Services | Custom CNC Milled Parts Manufacturer. Any issue is reported, isolated and handled promptly to keep the process stable.
Gate 05
Approved parts move into the warehouse or next process according to the production plan, with records kept for traceability.
Gate 06
Only parts that pass final inspection, documentation review and packing confirmation are released for delivery.
Read recent technical articles related to this service before preparing your RFQ.
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1. Why CNC matters for complex metal housings 2. What the part tells you about the manufacturing route 3. Key features buyers should evaluate 4. Why cast-and-machined aluminum is so common 5. Selection criteria that actually help 6. Practical buyer cautions 7. What to ask before you place an order 8. Next step
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1. Why CNC machining matters for cast aluminum housings 2. What this kind of part is designed to do 3. Why high-pressure die casting is often paired with CNC machining 4. Key features buyers should evaluate 5. Common mistakes when sourcing this type of housing 6. What to ask a supplier before ordering 7. How this connects to real buyer decisions 8. FAQ: quick buyer questions 9. Next step
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1. Why CNC machining matters on a complex cast housing 2. What buyers should look for first 3. How the casting and machining stages work together 4. Common sourcing mistakes with machined cast housings 5. Practical selection advice for engineering and procurement teams 6. FAQ: a few questions buyers usually ask 7. What to do next
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1. Why CNC matters on cast housings and functional bodies 2. What this type of part is trying to achieve 3. Quick buyer takeaway: what to check before you approve the part 4. Why cnc machining is the critical step 5. Design and sourcing criteria that matter most 6. Common mistakes buyers still make 7. Practical questions to ask a supplier 8. Next step
The general tolerance is ±0.02~±0.05mm for 3-axis, ±0.015~±0.03mm for 4-axis, and ±0.008~±0.02mm for 5-axis.3
Recommended minimum wall thickness is1.5mm for aluminum and 2.0mm for steel to prevent deformation.
Standard end mills are circular; minimum inner fillet R0.8~R1.5 is required to avoid tool collision and poor finishing.
The safe depth-to-diameter ratio is 5:1. Excessively deep holes require customized tools.
3-axis for simple flat parts; 4-axis for rotational parts; 5-axis for complex curved & angular parts with one-time clamping.3
Reserve 0.05~0.15mm extra margin for anodizing, plating and powder coating.
The minimum feasible slot width is 1.0mm with standard cutting tools.
Yes. Undercuts deeper than 5mm require 4/5-axis machining, which increases production cost.
Vertical CNC milling machines, with their vertically oriented spindles, are ideal for precision work on smaller components, offering excellent visibility and versatility for tasks like drilling and boring. Horizontal CNC milling machines, featuring horizontally oriented spindles, excel in handling larger, heavier workpieces and provide enhanced stability and efficient chip removal. For projects requiring extensive material removal and high durability, horizontal milling is preferred. In contrast, vertical milling is best for intricate, detailed work. Choosing between these types depends on your specific CNC milling services needs, whether for precision or bulk machining.
We provide professional CNC milling solutions, free DFM analysis and technical consultation for your projects.
