How a Custom Hydraulic Cylinder Is Manufactured, Stage by Stage
A custom hydraulic cylinder is not picked from a catalogue — it is engineered around a machine's duty cycle, mounting envelope and working pressure. Understanding the manufacturing sequence helps procurement teams ask the right questions before releasing an order.
1. Drawing review and design freeze
Every custom build starts with the customer drawing or application data: bore, stroke, working pressure, mounting style, rod end, port sizes, cushioning and duty cycle. Where only an application is supplied, our engineers calculate bore and rod diameter from the required push and pull force, then check the rod for buckling over the extended stroke.
The design is frozen only after the mounting envelope, pin centres and port orientation are confirmed in writing. This avoids the most common cause of rework on custom cylinders — a cylinder that performs correctly but does not fit the machine.
2. Barrel preparation from honed tube
The barrel is cut from precision honed tube so the bore already carries the correct H8/H9 tolerance and mirror finish. Cutting to length, facing and boring for the end cap register follow, with the bore protected throughout to prevent scoring.
3. Piston rod machining and hard chrome plating
Rod stock is straightened, turned and ground, then hard chrome plated and polished. Thread forms, rod eyes and cross holes are machined before plating wherever possible so that the plated surface is not interrupted by later machining.
4. Welding and machining of end assemblies
Gland housings, clevises, trunnions and port bosses are welded using MIG or TIG depending on section thickness and material. Welded assemblies are then re-machined so that seal grooves and bearing surfaces stay concentric with the bore after weld distortion.
5. Assembly, testing and packing
- Components are cleaned and assembled in a controlled area with the specified seal package.
- Each cylinder is hydrostatically tested above its rated working pressure and checked for external leakage and internal bypass.
- Stroke, retracted length and pin centres are verified against the approved drawing.
- Rods are coated with rust preventive, ports are plugged and units are packed with VCI film for domestic or export dispatch.
Frequently asked questions
What information do you need to quote a custom hydraulic cylinder?
Bore, stroke, working pressure, mounting type, rod end detail and port size — or a drawing. If you only have the application, share the required force, speed and machine envelope and our engineers will propose a specification.
Can you manufacture a replacement cylinder from a sample?
Yes. We reverse-engineer a sample cylinder into a manufacturing drawing, confirm it with you and then build to that approved drawing.