OEM CNC Machined Hydraulic Machinery Parts from China Per Drawing
We are a China-based custom CNC machining workshop dedicated to manufacturing hydraulic machinery parts strictly to customer drawings, CAD models and physical samples. As an experienced source of CNC machined hydraulic parts in China, we mill, turn, grind, hone and finish hydraulic manifold blocks, hydraulic valve blocks, valve spools and sleeves, hydraulic cylinder components, pump and motor parts, hydraulic fittings, flanges and many other precision hydraulic components — from a single prototype or one replacement spare to repeat batches and full high-volume production programs.
Per Drawing or Per Sample
Production from PDF, DWG, STEP, IGES or Parasolid files, or directly from a physical sample with reverse engineering and inch/metric conversion.
One Piece to Mass Production
Single-piece spares, first articles, small batches, scheduled repeat orders and large CNC production runs all follow the same process controls.
Hydraulic-Specific Features
Cross-drilled oil galleries, O-ring glands, SAE and metric ports, spool-to-sleeve clearance fits and fully deburred intersecting holes.
Materials & Finishes
Carbon steel, alloy steel, stainless steel, ductile iron, aluminum, brass, bronze and engineering plastics, with more than twelve finish options.
Hydraulic systems leave no room for leak paths, mismatched spool clearances or burrs carried by the oil flow. Our process planning starts from the function of the part: sealing surfaces are machined to a controlled roughness, spool bores are finished for a consistent clearance, intersecting galleries receive edge-break deburring at every cross hole, and each port thread and cavity is cut to the geometry its seal actually requires.
Whether you are looking for a China supplier of CNC milled hydraulic manifold blocks, CNC turned hydraulic fittings, ground hydraulic piston rods, honed cylinder tubes, electroless nickel plated hydraulic valve blocks or custom-machined directional and proportional valve spools, the same workshop carries your component from verified raw material through machining, surface treatment and final dimensional inspection.
CNC Machined Hydraulic Parts Produced in Our Workshop
A selection of custom hydraulic components recently produced on our CNC milling, turning and grinding equipment. Every item is manufactured to the customer's own drawing or sample.
Custom Hydraulic Parts We Machine Per Drawing
We do not sell a fixed catalog. Each item below can be customized in material, dimension, port pattern, thread standard and surface treatment according to your drawing, model or physical sample.
Hydraulic Manifold & Valve Blocks
- Monoblock and sectional hydraulic manifold blocks
- Custom CNC hydraulic blocks and integrated valve blocks
- Transition blocks, junction blocks and sandwich plates
- Cartridge valve blocks and logic valve cover plates
- Lift blocks, counterbalance blocks and test bench blocks
Hydraulic Valves & Valve Internals
- Valve bodies, bonnets and end caps
- Hydraulic valve spools and matched valve sleeves
- Directional spools, proportional spools and servo spools
- Poppets, valve seats, check valve cartridges
- Relief, needle, throttle and flow-control valve stems
Hydraulic Cylinder Components
- Hydraulic pistons, piston rods and cushion sleeves
- Cylinder glands, end caps, rod guides and barrels
- Honed cylinder tubes and skive-burnished tubes
- Mounting flanges, clevises, trunnions and eye brackets
- Wear rings, guide rings and spacer bushings
Pump & Hydraulic Motor Parts
- Gear pump bodies, gear sets and drive shafts
- Vane pump rotors, vanes and cam rings
- Piston pump cylinder blocks and valve plates
- Swash plates, slipper shoes and retainer plates
- Orbital motor rotors, output shafts and mounting flanges
Hydraulic Fittings, Flanges & Adapters
- Male and female hydraulic adapters and reducers
- JIC, ORB, BSPP, NPT and metric threaded fittings
- SAE flange halves, socket-weld and counter flanges
- Hydraulic couplings, elbows, tees, crosses and standpipes
- Banjo bolts, bulkhead fittings and welded nipples
Cartridge Valve & Circuit Components
- Cartridge valve cavities and cavity plugs
- Compensator spools and pressure compensator parts
- Flow divider and priority valve components
- Load-sensing valve parts and logic elements
- Relief cartridge bodies and adjustment screws
Power Unit & Accessory Parts
- Pump brackets, bell housings and adapter flanges
- Filter heads, filter housings and filler bases
- Pressure gauge adapters and sensor/transducer bodies
- Accumulator end caps, gas valve bodies and pistons
- Cooler end covers and tank-mounted transition plates
Sealing, Wear & Polymer Parts
- CNC machined TPU seal rings and U-cup seals
- POM backup rings and PEEK seal rings
- Wear bands, guide bands and spacer rings
- Nylon, PTFE and UHMWPE machined inserts
- Rotary seal seats and polymer bearing sleeves
Machining and Inspection Equipment for Hydraulic Parts
The production and verification equipment used every day to manufacture and check CNC machined hydraulic parts before they leave the workshop.
CNC Milling Service
3-axis, 4-axis and 5-axis CNC milling centers produce hydraulic manifold blocks, valve bodies, pump housings and custom blocks with cross-drilled galleries, threaded ports, O-ring grooves and precise mounting faces.
CNC Turning Service, China
CNC lathes and turn-mill machines produce shafts, piston rods, pistons, sleeves, bushings, adapters, fittings and flanges, combining operations in one clamping wherever possible to preserve concentricity between sealing diameters.
2D Profile Projector Measuring
A digital optical profile projector checks small profiles, chamfers, radii, thread forms, spool land edges and seal-ring cross sections that cannot be captured reliably with hand-held measuring tools.
CMM Testing
A coordinate measuring machine verifies hole position, pitch, true position, flatness, parallelism, perpendicularity and bore-to-face relationships on manifold blocks and valve bodies against the drawing.
Materials Machined for Hydraulic Applications
Raw material heat and lot numbers are recorded for every order, and alloy composition is verified by spectrometer before cutting. The material list below covers the grades most commonly specified on hydraulic machinery drawings.
Carbon & Free-Cutting Steel
- 1045 / C45 / S45C medium carbon steel blocks and bars
- Q235, A36 and 1020 structural carbon steel
- 1215 and 12L14 free-cutting steel for fittings
- Typical for manifold blocks, adapters and brackets
Alloy & Bearing Steel
- 4140 / 42CrMo and 4340 high-strength alloy steel
- 35CrMo, 27SiMn and 20CrMnTi case-hardening grades
- GCr15 / 52100 bearing steel for sleeves and races
- Typical for high-pressure blocks, shafts and gears
Stainless & Corrosion-Resistant Steel
- 304 / 304L and 316 / 316L austenitic stainless
- 410, 420 and 17-4PH precipitation-hardening stainless
- Duplex stainless for marine hydraulic fittings
- Typical for corrosive, wash-down and offshore use
Gray & Ductile Cast Iron
- HT200 / HT250 gray iron for pump and valve bodies
- QT450, QT500 and QT600 ductile (nodular) iron
- Cast steel blanks for heavy-duty hydraulic structures
- Typical for gear pumps, motors and housings
Aluminum, Brass & Bronze
- 6061, 6082, 7075 and 2024 aluminum blocks and bars
- H59 / H62 brass and leaded brass for fittings
- Tin bronze and aluminum bronze for bushes and guides
- Typical for lightweight blocks and wear components
Engineering Plastics & Elastomers
- POM / Delrin, PA66 and cast MC nylon parts
- PEEK, PVDF, UHMWPE and filled PTFE components
- TPU machined seal rings and polyurethane wear parts
- Typical for seals, backup rings and guide elements
In-House CNC Machining Processes for Hydraulic Components
A complete process chain under one schedule allows tight features — bores, galleries, threads, ground seats and lapped fits — to be coordinated without stacked lead times.
3 / 4 / 5-Axis CNC Milling
Milling of hydraulic manifold blocks, valve bodies, custom blocks, mounting pads and multi-face features with precision-fixtured setups for accurate port-to-face relationships.
CNC Turning & Turn-Mill
Turning of piston rods, shafts, pistons, sleeves, bushings and hydraulic fittings; live-tool turn-mill completes cross holes and flats in a single clamping.
Deep-Hole & Gun Drilling
Straight deep oil galleries and intersecting cross holes in manifold blocks, with controlled drill walk, chamber deburring and clean flow paths.
Precision Grinding
Surface grinding, cylindrical grinding and centerless grinding for piston rods, spools, valve seats and sealing faces that demand roundness and fine finish.
Honing & Skive Burnishing
Honed spool bores and cylinder bores with a controlled cross-hatch pattern; skive-burnished cylinder tubes for smooth seal travel and long seal life.
Wire & Sinker EDM
Wire-cut profiles and sinker-EDM cavities for spool notches, irregular openings, hardened parts and features that are difficult or fragile to cut by milling.
Threading & Port Machining
NPT, BSPP (G), metric, UNF and SAE O-ring boss threads, plus standard cartridge valve cavities cut with spot drills, port tools and thread mills.
Deburring & Part Marking
Cross-hole and gallery deburring, vibratory and hand finishing, edge-break control and permanent laser engraving of part numbers and lot codes.
Dimensional Accuracy and Surface Quality We Achieve
Hydraulic performance is decided in microns: spool response depends on matched clearance, sealing depends on surface roughness, and leak-free assembly depends on geometric accuracy. The capability ranges below reflect features routinely produced on our equipment.
General & Precision Tolerances
General non-critical features follow common medium-grade machining practice comparable to ISO 2768-m, while tight machined features are held to ±0.005–±0.01 mm as specified on the drawing.
Bore & Shaft Fit Grades
Precision bores are finished to H6 / H7 and shafts to g6 / h6 / f7 as required; overall feature grades range from IT8 on general milling up to IT5–IT6 on ground, honed or lapped fits.
Geometric Tolerance Control
Flatness, parallelism and perpendicularity of sealing and mounting faces are controlled at 0.005–0.02 mm, with cylindricity and coaxiality managed on spool bores and rod seating diameters.
Milled Surface Roughness
Standard CNC milled faces reach Ra 1.6–3.2 µm; fine-finish milling reaches Ra 0.8 µm on manifold sealing pads, valve mounting faces and pump joint surfaces.
Turned & Ground Roughness
CNC turned diameters are typically Ra 0.8–1.6 µm; cylindrical and surface grinding reaches Ra 0.2–0.8 µm on piston rods, spools, seats and bearing journals.
Honed & Lapped Finishes
Honed cylinder and spool bores reach Ra 0.1–0.4 µm with a defined cross-hatch; matched lapped spools and sleeves reach Ra 0.05–0.2 µm with micrometer-level clearance control.
Every sealing surface, O-ring gland face and spool land is planned with its function in mind: edge breaks are kept consistent, sharp internal intersections are removed so they cannot shed burrs into the circuit, and surface roughness is spot-checked with a portable profilometer rather than judged by eye. Hardness after heat treatment is verified with calibrated hardness testers before finish grinding.
Inspection instruments include the coordinate measuring machine, 2D profile projector, digital height gauges, inside/outside micrometers, bore gauges, pin gauges, thread ring and plug gauges for NPT, BSPP, metric and UNF threads, air gauges for matched bores, roughness testers and hardness testers. Parts are degreased after machining, and finished steel components receive anti-rust treatment before packaging.
Surface Treatments Available for CNC Machined Hydraulic Parts
Surface treatment is coordinated with finish machining: plating and coating allowances are planned in advance, and parts requiring post-treatment grinding are finished to final size after treatment.
Electroless Nickel Plating
An even nickel-phosphorus layer over complex hydraulic blocks and valve bodies, giving uniform coverage in deep galleries and stable port dimensions.
Zinc / Zinc-Nickel Plating
Thin, dimension-friendly plating for carbon steel fittings, brackets, shafts and external hydraulic parts, with trivalent passivation films.
Black Oxide (Blackening)
An economical dark conversion finish sealed with oil for internal steel parts, shafts and fasteners where dimensional change must stay minimal.
Manganese / Zinc Phosphating
Phosphate conversion coatings that aid running-in and add corrosion resistance on spools, cylinder parts and welded hydraulic assemblies.
Hard Chrome Plating
Wear-resistant hard chromium on piston rods, pins and journals, followed by precision grinding and polishing to the final diameter and finish.
Nitriding & QPQ Treatment
Gas nitriding, ion nitriding and QPQ salt-bath processing deliver hard, wear-resistant surfaces on spools and gears with very low distortion.
Induction Hardening
Selective surface hardening of piston rods, gear teeth, pins and shaft journals, followed by finish grinding to restore size and roughness.
Anodizing / Hard Anodizing
Standard and hard anodic coatings on aluminum hydraulic blocks, end caps and housings, with natural, black or custom dye coloring.
Stainless Passivation & Pickling
Removal of free iron, scale and embedded contamination from 304/316 stainless hydraulic parts to restore clean corrosion-resistant surfaces.
Powder Coating & E-Coating
Durable exterior films for tank lids, pump brackets, power-unit fabrications and large welded hydraulic structures exposed to weather.
Blasting, Brushing & Polishing
Bead or sand blasting, satin brushing and directional or mirror polishing for cosmetic surfaces, seal preparation and uniform appearance.
PTFE / MoS2 / DLC Coatings
Low-friction solid-film coatings on spools, pins and sleeves that reduce break-away force, stick-slip tendency and running wear.
From a Single Prototype to High-Volume Production
The same drawing-driven process supports one-off replacement spares and monthly blanket orders alike; fixturing and inspection plans are simply scaled to the quantity.
Prototype / Single Piece
One-off CNC machined hydraulic parts from a drawing, sketch or worn physical sample, including reverse engineering of discontinued spares for repairs.
Small Batch
Runs of roughly 5–500 pieces for machine builders, retrofit projects and first-article validation before a design is released to serial production.
Repeat Batch
Campaigns of roughly 500–10,000 pieces with dedicated soft or hydraulic fixtures, fixed tooling lists and lot-by-lot process consistency.
High-Volume Production
Programs above 10,000 pieces run on dedicated milling and turning cells with optimized cycle time, in-process checks and standardized packaging.
How a Custom Hydraulic Part Is Produced Per Drawing or Sample
A fixed six-step route keeps every CNC machined hydraulic component traceable from the incoming drawing or sample to the packed, ready-to-ship part.
Drawing & Sample Intake
Review of PDF, DWG, STEP, IGES or Parasolid files, or dimensional inspection of a physical sample; critical dimensions, threads and ports are clarified up front.
DFM Review & Planning
Material choice, blank route, fixturing concept, tolerance feasibility, spool or port strategy and surface-treatment plan are confirmed before production starts.
Material & Blank Preparation
Sawing of bar stock or sourcing of forgings, castings and tubes; heat and lot numbers are recorded and alloy composition is verified by spectrometer.
CNC Machining
Milling, turning, drilling, grinding, honing or EDM work proceeds operation by operation, with in-process dimensional checks after each key step.
Treatment & Final Inspection
Plating, coating or heat treatment is followed by CMM, profile projector, gauge, hardness and roughness verification against the drawing.
Cleaning & Packaging
Degreasing, anti-rust treatment, capped and plugged ports, individual bagging and export-suitable packing labeled with part number and production lot.
Hydraulic Equipment and Industries Served
CNC machined hydraulic parts produced in our workshop are used across mobile and industrial hydraulic equipment around the world.
Construction & Earthmoving
Excavators, wheel loaders, bulldozers and skid steers — main control valve blocks, travel motor parts and cylinder components.
Injection Molding & Die Casting
Hydraulic machine manifolds, clamping cylinder parts, ejector components and proportional directional valve spools.
Presses & Machine Tools
Hydraulic press blocks, jack cylinders, slide valve parts and accumulator components for forming and shearing equipment.
Agricultural Machinery
Tractor hydraulic lift blocks, hitch valve parts, steering motor components and harvester hydraulic fittings and adapters.
Mobile & Truck-Mounted Equipment
Truck cranes, hook lifts, aerial work platforms, refuse collection vehicles and trailer hydraulic systems.
Marine & Deck Machinery
Winch and deck crane hydraulic components, steering gear parts and corrosion-resistant stainless hydraulic fittings.
Mining, Steel & Metallurgy
Heavy-duty valve blocks, high-pressure manifold systems and hydraulic components for shears, casters and continuous lines.
Energy, Lifting & Logistics
Wind turbine hydraulics, solar tracker drives, lift tables, forklifts and other material-handling and lifting equipment.
Why Buyers Source CNC Machined Hydraulic Parts from Our China Workshop
We compete on hydraulic understanding, measurable precision and repeatable batch quality — not on a fixed standard-product catalog.
Hydraulic-Focused Experience
Years of work on manifold blocks, valve spools, sleeves and cylinder parts mean drawings are reviewed by people who understand valve land geometry, port sealing and oil flow behavior.
Drawing & Sample Flexibility
Parts are produced from CAD models, scanned sketches or worn physical samples, with reverse engineering available for obsolete hydraulic components no longer supplied.
Complete In-House Process Chain
Milling, turning, grinding, honing, EDM and surface-treatment coordination run under one production schedule, removing the lead-time stacking of chained subcontractors.
Measured, Documented Quality
CMM, profile projector, gauges and roughness testers verify critical features, and inspection records are retained by part number and production lot for full traceability.
Flexible Volume, Stable Repeats
The same fixtures, tooling lists and inspection plans are reused on every repeat order, so the tenth batch matches the first batch in size, finish and function.
Export-Ready Communication
English drawing review, inch-to-metric conversion, NPT/BSPP/SAE/metric thread handling and export-standard packaging with capped ports and anti-rust protection.
As a China CNC machining partner for OEM hydraulic machinery parts, we support hydraulic equipment manufacturers, valve assemblers, hydraulic repair workshops and industrial integrators who need custom components made precisely per drawing — whether the requirement is a single custom hydraulic valve spool, a small batch of CNC milled hydraulic manifold blocks, or a monthly blanket order of CNC turned hydraulic fittings and flanges.
Alongside core searches such as "CNC machined hydraulic parts China", our scope covers the full long-tail of hydraulic machining demand: custom hydraulic valve block machining, precision hydraulic spool and sleeve manufacturing, ground and hard-chrome hydraulic piston rods, honed hydraulic cylinder tubes, CNC machined hydraulic pump and motor components, nickel plated hydraulic blocks, machined TPU/POM/PEEK seal rings, hydraulic cartridge valve cavities, SAE and metric hydraulic flanges and adapters, and prototype-to-mass-production supply of any other hydraulic part defined by a customer drawing or sample. Mark the critical dimensions, specify the material and finish, and the component is planned, machined, treated, measured and packed around the way it will actually work inside the hydraulic system.