5-axis CNC milling drawing: Al 7075-T6 block with pockets, toolpath and dimensions

CNC for Hydraulic

Valve bodies. Cylinder bores. Pressure tested.

Q: Cylinder bore finish requirements?

Hydraulic cylinder bores typically require: diameter tolerance ±0.025 mm (H7 class), surface finish Ra 0.4 µm, crosshatch pattern 30-45° for seal lubrication retention. Production workflow: precision bore (CNC) → rough hone → finish hone with crosshatch. The crosshatch pattern is critical — it retains hydraulic fluid film for consistent seal performance.

Q: Pressure testing capabilities?

Standard hydraulic testing: 1.5× working pressure for 5 minutes (industrial), 2× working pressure for aerospace. Our pressure testing: hydraulic pump to 500 bar, helium leak detection for critical applications. Test documentation provided with parts. For aerospace hydraulic components, witnessed pressure testing with customer or third-party inspection available.

Q: O-ring port manufacturing?

SAE J1926 straight thread O-ring ports (UNF thread + O-ring seal) standard on hydraulic manifolds. Metric ISO 6149 ports available. Critical dimensions: thread, O-ring seat (controlled diameter and depth), spotface for fitting bottom. Typical tolerance ±0.05 mm on all features. Our manifolds test-fitted with production fittings before shipment.

Q: Deep hole drilling for cylinder tubes?

Long hydraulic cylinders (1-2m) require deep hole drilling — straight holes impossible with conventional twist drills. Gun drilling produces ±0.1 mm straightness per 100 mm of depth. For longer cylinders, BTA drilling for larger diameters. Post-drilling honing brings bore to final finish and tolerance.

Q: Chrome plating of cylinder rods?

Hard chrome plating on hydraulic rods: 25-50 µm thick, hardness 60+ HRC, Ra 0.2 µm finish. Chrome provides wear resistance against seals and corrosion resistance. Our rod production: CNC turning + induction hardening (for 4140 rod) + grinding + chrome plating + final polish. Chrome thickness documented per order.

Q: NACE compliance for oil & gas hydraulic?

NACE MR0175 compliance for sour-service (H2S) hydraulic components: specific material selection (316L, Monel, Inconel), hardness control (typically <22 HRC on flow-wetted surfaces), no cadmium or zinc plating. Full material certification and hardness testing documentation. For oil & gas customers, standard capability with documented compliance.

CNC machining of hydraulic system components: valve bodies, cylinder tubes, manifold blocks, piston rods, specialty fittings. Deep hole drilling for long bores, precision boring and honing for seal surfaces, pressure testing to verify integrity.

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Fluid, valve & pressureWuxi, ChinaMOQ 1 partDFM review included

Technical plate for Valve bodies. Cylinder bores. Pressure tested.

How we run it

CNC for hydraulic components

Hydraulic component manufacturing requires specific processes — deep hole drilling, precision boring, honing, pressure testing. We handle the full workflow.

3-7 daysTypical lead time

MOQ 1No minimum quantity

<4 hQuote response

ISO 9001Quality system

01 · Hydraulic categories

Hydraulic components we machine.

Valve bodies

Directional control valves, pressure control valves, flow control valves. Precision bore finishes for spool fit.

Cylinder tubes

Hydraulic cylinder tubes with honed bore and chrome-plated rod. Complete cylinder assemblies.

Piston rods

Hydraulic cylinder rods. Induction hardened or chrome plated for wear resistance.

Manifold blocks

Hydraulic manifold blocks with internal porting and O-ring face port connections.

Flange adapters

Hydraulic flanges per SAE J518 Code 61 and 62 standards. NPT and metric port adapters.

Check valves

Check valve bodies, poppet valves, pilot-operated check valves.

Filter housings

Hydraulic filter housings, strainer hardware, specialty filtration components.

Accumulator hardware

Hydraulic accumulator shell components, valve hardware, mounting.

Custom fittings

O-ring boss, JIC 37°, SAE 45° fittings in specialty sizes and configurations.

Hydraulic component manufacturing requires specific processes — deep hole drilling, precision boring, honing, pressure testing. We handle the full workflow.

02 · Hydraulic customers

Customers we serve.

Industrial hydraulic OEMs

Industrial machinery manufacturers — stamping presses, injection molders, machine tools

Mobile equipment

Construction equipment (Caterpillar, Komatsu, Volvo) — cylinder and valve components

Aerospace hydraulic

Aircraft hydraulic systems (flight controls, landing gear) — high-pressure precision

Oil & gas hydraulic

Downhole hydraulic tools, wellhead hardware — NACE-compliant where required

Agricultural equipment

Tractor, combine, implement hydraulic components

Marine hydraulic

Ship steering, winch, cargo handling hydraulic systems

Railway hydraulic

Locomotive and rail car hydraulic components

Heavy industrial

Mining equipment, forestry equipment hydraulic hardware

Defense hydraulic

Military vehicle hydraulic systems, weapon system actuators

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CNC, 3D printing, injection molding, sheet metal, casting, finishing — one quality system, one partner.

FAQ

Valve bodies — questions

Cylinder bore finish requirements?

Hydraulic cylinder bores typically require: diameter tolerance ±0.025 mm (H7 class), surface finish Ra 0.4 µm, crosshatch pattern 30-45° for seal lubrication retention. Production workflow: precision bore (CNC) → rough hone → finish hone with crosshatch. The crosshatch pattern is critical — it retains hydraulic fluid film for consistent seal performance.

Pressure testing capabilities?

Standard hydraulic testing: 1.5× working pressure for 5 minutes (industrial), 2× working pressure for aerospace. Our pressure testing: hydraulic pump to 500 bar, helium leak detection for critical applications. Test documentation provided with parts. For aerospace hydraulic components, witnessed pressure testing with customer or third-party inspection available.

O-ring port manufacturing?

SAE J1926 straight thread O-ring ports (UNF thread + O-ring seal) standard on hydraulic manifolds. Metric ISO 6149 ports available. Critical dimensions: thread, O-ring seat (controlled diameter and depth), spotface for fitting bottom. Typical tolerance ±0.05 mm on all features. Our manifolds test-fitted with production fittings before shipment.

Deep hole drilling for cylinder tubes?

Long hydraulic cylinders (1-2m) require deep hole drilling — straight holes impossible with conventional twist drills. Gun drilling produces ±0.1 mm straightness per 100 mm of depth. For longer cylinders, BTA drilling for larger diameters. Post-drilling honing brings bore to final finish and tolerance.

Chrome plating of cylinder rods?

Hard chrome plating on hydraulic rods: 25-50 µm thick, hardness 60+ HRC, Ra 0.2 µm finish. Chrome provides wear resistance against seals and corrosion resistance. Our rod production: CNC turning + induction hardening (for 4140 rod) + grinding + chrome plating + final polish. Chrome thickness documented per order.

NACE compliance for oil & gas hydraulic?

NACE MR0175 compliance for sour-service (H2S) hydraulic components: specific material selection (316L, Monel, Inconel), hardness control (typically <22 HRC on flow-wetted surfaces), no cadmium or zinc plating. Full material certification and hardness testing documentation. For oil & gas customers, standard capability with documented compliance.

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