Hydraulic Manifold CNC Machining

CNC Machined Hydraulic Manifolds

Precision-machined manifolds with intersecting passages, port drilling, and mounting interfaces. Tolerances to ±0.005mm. Pressure tested to 10,000 PSI.

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±0.005mm
Standard Tolerance
10,000 PSI
Max Pressure Rating
1.5×
Pressure Test Ratio
5-7 Days
Prototype Lead Time
ISO 9001:2015
AS9100D
ISO 13485
NADCAP
CNC machined hydraulic manifold
Engineering Context

Hydraulic Manifold Design Requirements

According to our CNC machining knowledge base, CNC machining is a subtractive manufacturing process where computer programs direct cutting tools to remove material from solid blocks, creating precise parts with complex geometries. A hydraulic manifold is a solid block containing drilled or milled passages that direct fluid between pumps, actuators, and valves.

Functional reliability depends on four machined features: intersecting passages with burr-free edges, port threads meeting class tolerance, sealing surfaces with controlled flatness, and mounting interfaces maintaining positional accuracy. CNC Works AI produces manifolds in aluminum, steel, and stainless steel with full traceability and pressure verification.

  • Passage positional tolerance: ±0.05mm typical
  • Port thread fit: Class 2B/3B or BSPP/UNF per drawing
  • Seating surface flatness: ≤0.02mm over mating area
  • Pressure test: 1.5× working pressure, 30-second hold
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Capabilities

Manufacturing Capabilities for Hydraulic Manifolds

3-Axis & 4-Axis CNC Milling

Standard face milling, drilling, tapping, and boring of manifold faces and port patterns.

Max envelope: 2000 × 1500 × 200 mm

5-Axis Simultaneous Machining

Complex angled ports and intersecting passages machined in a single setup.

Max envelope: 650 × 650 × 300 mm

CNC Turning with Live Tooling

Cylindrical bosses, ports, and bores on manifold extensions.

Max diameter: 431 mm, length: 990 mm

Deep Hole Drilling

Long intersecting passages with controlled straightness and surface finish.

L/D ratios up to 20:1

Precision Tapping & Thread Milling

UNF, BSPP, NPT, and metric threads with class-fit accuracy.

M5 to M42 and equivalent

Deburring & Passage Cleaning

Removal of burrs from intersecting holes to prevent contamination.

Ultrasonic and high-pressure flushing
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Design & Machining

Critical Manifold Machining Considerations

Intersecting passages in hydraulic manifold

1. Intersecting Passages

Internal galleries must maintain straightness and positional accuracy. Drill wander at depth causes misalignment with valve pockets. CNC Works AI uses gun drills and long-reach end mills with through-coolant to control bore straightness.

Straightness: ≤0.1mm per 100mm Ra: 0.8–3.2 μm Deburr: Required at all intersections
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2. Port Threads & Sealing Surfaces

Threaded ports must seal under cyclic pressure. Class-fit threads and controlled surface roughness prevent galling and leakage. Sealing surfaces are machined flat to ISO 2768-f or tighter when specified.

Threads: UNF, BSPP, NPT, Metric Class: 2B/3B, 6H Flatness: ≤0.02mm
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Hydraulic manifold port threads
Hydraulic manifold mounting interface

3. Mounting Interfaces

Bolt patterns and dowel holes locate the manifold relative to valves and pumps. Positional errors cause port misalignment and O-ring extrusion. CMM inspection verifies true position to drawing tolerances.

True Position: ±0.05mm typical Dowel H7: Available Bolt Holes: Clearance or threaded
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4. Undercuts & Valve Pockets

Cartridge valve pockets and undercut features require specialized tooling and 5-axis access. Precise pocket diameter and depth ensure correct valve seating and flow characteristics.

Pocket Tolerance: ±0.01mm Depth: ±0.02mm Surface: Ra 0.4–1.6 μm
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Hydraulic manifold valve pockets
Materials

Material Specifications

MaterialKey PropertiesTypical ApplicationsSurface Treatment
6061-T6 Aluminum Good strength-to-weight, excellent machinability, corrosion resistant Medium-pressure industrial manifolds, aerospace hydraulic blocks Hard anodize Type III, chem film
7075-T6 Aluminum High strength, fatigue resistant, lightweight Mobile hydraulic systems, weight-critical manifolds Hard anodize, PTFE impregnation
316L Stainless Steel Superior corrosion resistance, non-magnetic Marine, chemical, food-grade hydraulic systems Passivation, electropolish
17-4PH Stainless Steel High strength and hardness after H900 heat treatment High-pressure valve blocks, defense, oil & gas Hardened, passivated, electroless nickel
1215 Carbon Steel Excellent machinability, cost-effective General industrial manifolds with plating Electroless nickel, zinc phosphate
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Quality Assurance

Quality Control Process

1

Incoming Inspection

Material certification, hardness verification, and raw-stock dimensional check.

2

In-Process Inspection

First-article inspection, SPC monitoring, and bore diameter checks during machining.

3

Final Verification

CMM measurement of port positions, surface roughness testing, and pressure testing.

4

Documentation

Dimensional report, material cert, pressure-test record, and CoC issued per order.

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Finishing

Surface Treatment Options

FinishSpecificationBenefit
Hard Anodize Type IIIASTM B580, 25–75 μmWear resistance and corrosion protection for aluminum manifolds
Electroless NickelAMS 2404, 5–25 μmUniform coating thickness and corrosion resistance
PassivationASTM A967Restores corrosion resistance of stainless steel after machining
PTFE CoatingThickness 10–50 μmLow friction and chemical resistance for sealing surfaces
Bead BlastGlass bead, 120–220 meshUniform matte finish and stress relief appearance
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Process

Manifold Manufacturing Workflow

1

Design Review

CAD review, DFM analysis, and material selection

2

CAM Programming

Toolpath generation and machining simulation

3

Rough Machining

Exterior profiling and major face milling

4

Drilling & Tapping

Passages, ports, and mounting holes

5

Finish Machining

Sealing surfaces and precision bores

6

Inspection

CMM, pressure test, and surface check

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Request a Technical Quote

Submit your manifold drawing, pressure requirements, and material specification. CNC Works AI will provide DFM feedback and a detailed quote within 24 hours.

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Frequently Asked Questions

Hydraulic manifolds are manufactured for pressure ratings from 3,000 PSI (210 bar) standard duty to 10,000 PSI (700 bar) high-pressure applications. Each manifold is pressure-tested to 1.5× working pressure with a 30-second minimum hold time.

Standard dimensional tolerance is ±0.005mm (±0.0002"). Port positional tolerance is typically ±0.05mm. For precision sealing surfaces, flatness is controlled to ≤0.02mm. Geometric tolerances down to ±0.010 mm are achievable when specified on the technical drawing.

CNC Works AI produces UNF, UNC, BSPP, BSPT, NPT, NPTF, and metric threads (M5 through M42 and larger). Thread fit classes include 2B/3B for inch threads and 6H/6g for metric threads per ISO 965 and ASME B1.1 standards.

CNC machining removes material from a solid block using programmed cutting tools. For manifolds, through-coolant drills and long-reach end mills control bore straightness. After machining, all intersecting holes are deburred and passages are flushed ultrasonically or with high-pressure fluid to remove chips and burrs.

Aluminum 7075-T6 is recommended for weight-critical, high-strength manifolds. It offers tensile strength comparable to many steels while maintaining low density. For welded or corrosion-sensitive applications, 6061-T6 is preferred due to its superior corrosion resistance and weldability.

Available surface treatments include hard anodize Type III per ASTM B580, electroless nickel per AMS 2404, passivation per ASTM A967, PTFE coating, and bead blast. Selection depends on the operating fluid, pressure, and environmental exposure.

Inspection equipment includes CMM (Coordinate Measuring Machine), optical comparators, surface roughness testers, hardness testers, and pressure-test rigs. Every manifold receives a dimensional report and pressure-test record before shipment.

Standard prototype lead time is 5–7 business days. Rush service is available in 7–15 days for urgent projects. Production volumes of 1,000+ units typically deliver within 2–4 weeks depending on complexity and material availability.

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