One Supplier. One Quality System.
2.3 Million Parts Delivered in 2025.
Since 2006, Donlouco has supplied precision CNC-machined and forged steel parts to hydraulic cylinder manufacturers across Ireland, the UK & Europe. CNC machining is carried out in our own facility in Jiashan, China, managed from our head office in Cork.
All components are made to exact customer specifications, ISO 9001 & EN 1090 certified, and delivered plug-and-play ready to go straight onto your cylinder line.
Hydraulic Cylinder Parts & Assemblies.
Every hydraulic cylinder component is made to exact customer specification, from simple threaded weld ports to complex forged rod ends and ported valve blocks.
The Donlouco Advantage for
Hydraulic Manufacturers.
Our own CNC facility in Jiashan, Irish management and engineering in Cork, and a proven record with some of Europe's largest cylinder manufacturers, at a globally competitive price.
Our Own Factory in Jiashan
Your parts are CNC machined by Donlouco staff, on Donlouco machines, in a facility we own. The engineers who read your drawing in Cork work for the same company that runs the machine.
Full Traceability on Every Order
All shipments include raw material certification, dimensional reports and surface finish reports. Complete documentation for every part, every time.
Critical Quality & ISO Certified
ISO 9001 and EN 1090 approved for CE marking. All staff trained to European and US standards, with rigorous quality control and testing at every stage.
Plug & Play Delivery
Parts arrive ready to go straight onto your cylinder line, with no additional processing on receipt. Door-to-door delivery with customs managed by us.
Proven Cost & Quality Performance
A 100% quality pass rate on our largest hydraulics programme in 2025. China's cost base, with an Irish company accountable for every part and its documentation.
Flexible Manufacturing Capacity
Increase your capacity with minimal investment and no capital expenditure on your side, from small batches to high-volume annual programmes.
Precision CNC Machining for Hydraulic Components.
Hydraulic cylinder parts are CNC machined in our own facility in Jiashan, across a wide range of steels, including carbon steel, stainless steel and speciality alloys.
3, 4 and 5-axis machining centres let us manufacture large and small hydraulic components with complex geometries and fine surface finishes.
- 3, 4 & 5-Axis CNC Milling, including gantry machining.
- CNC turning on multi-tool combination machines.
- Machining accuracy: ±0.005mm general tolerance.
- Surface finish: Ra < 0.8μm.
- Machining of steel, cast steel or cast iron.
Valve port standards we machine to:
Forging for Hydraulic Cylinder Parts.
Cylinder bases, flanged parts and rod eyes are forged by approved partners to Donlouco tooling and specification, then CNC machined and inspected in our own facility. Forged parts are stronger and more durable than cast or machined-from-solid alternatives.
Optimised grain flow and material density give forged components the mechanical properties that demanding hydraulic applications need.
- Forging capacity up to 1,600 Ton (Die).
- Part weights from 0.5kg to 200kg+.
- Secondary CNC machining in our own facility, plus heat treatment as required.
- All steel grades to meet customer and European standards.
- Forging tools designed, managed & reverse-engineered by Donlouco.
- Full tensile, impact and dimensional testing available at approval stage.
Quality Control & Certifications.
Donlouco is ISO 9001 and EN 1090 approved for CE marking. Rigorous quality control and testing at every stage give you a sustainable supply of hydraulic parts that last.
- All parts checked at production stage in our own facility.
- All parts re-checked before shipping, with no exceptions.
- Full traceability: raw material certs, dimensional & surface finish reports.
- Tensile & impact testing available at approval stage and by sampling.
- All staff trained to European & US standards.
- Donlouco engineers in Cork and Jiashan: one company from drawing to dispatch.
Comprehensive testing: tensile testing a hydraulic rod end.
Common Questions About Our Hydraulic Parts.
Can't find the answer you need? Contact our team directly.
Donlouco supplies a full range of hydraulic cylinder components, including head glands, gland nuts, cylinder end caps, forged steel bases, pistons, ported valve blocks, clevis mounts, rod ends, forged steel eyes, and ends with fitted spherical bearings. Custom and non-standard parts are also available on request.
Yes. Donlouco owns and operates its CNC machining facility in Jiashan, China, through a wholly owned local company, managed from our head office in Cork. Hydraulic parts are CNC machined and inspected there by Donlouco staff. Forgings are produced by approved partners to our tooling and specification, then machined and inspected in our own facility.
The most common are rod eyes and clevises, which pivot in one plane on a pin; spherical bearing ends, which also take angular misalignment; trunnion mounts, which pivot on the cylinder body; and flange mounts, which fix the cylinder for straight-line push or pull. Donlouco manufactures all of these to customer drawing.
Yes. Donlouco is ISO 9001 and EN 1090 approved, and all hydraulic cylinder parts are manufactured and inspected to these standards. Every shipment includes full traceability documentation: raw material certifications, dimensional reports and surface finish reports.
Forged parts such as rod ends, steel eyes and cylinder bases offer greater strength, optimised grain flow and better fatigue resistance than machined-from-solid or cast alternatives. CNC machined parts offer tighter tolerances and suit complex geometry such as ported valve blocks, gland nuts and pistons. Donlouco provides both, including secondary CNC machining of forged blanks in our own facility.
Yes. Donlouco specialises in custom hydraulic cylinder gland parts, including non-standard profiles and special thread forms. Send us your drawings or specifications and our engineering team will return a full commercial and technical quotation, typically within one week.
From initial enquiry to first delivery, the typical lead time is 10–12 weeks for new parts that need tooling and sample approval. Repeat orders for established parts are significantly faster. All scheduling is managed by Donlouco from Ireland, with door-to-door delivery to your facility.
Donlouco supplies hydraulic cylinder parts to manufacturers across Ireland, the United Kingdom, Germany, France, the Netherlands, Belgium, Italy, Spain and Scandinavia. All shipments are managed door-to-door from our head office in Cork, Ireland.
Send Us a Drawing.
We'll Return a Full Quote Within One Week.
Full commercial and technical quotation for your hydraulic cylinder parts. ISO 9001 and EN 1090 certified, machined in our own facility and delivered to your door.
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