What Does “Non-Standard” Mean in Hydraulic Cylinders?
A non-standard hydraulic cylinder (also called a custom or bespoke cylinder) is one manufactured to specific dimensions, pressure ratings, mounting configurations, or seal specifications that fall outside the dimensional standards of off-the-shelf catalogue products.
Standard hydraulic cylinders follow widely adopted bore/stroke series — such as ISO 6020 or ISO 6022 for mill-type cylinders, or NFPA T3.6.7 for tie-rod designs. Any cylinder that deviates from these standard series in bore diameter, stroke, port size, mounting style, seal material, or surface finish is classified as non-standard.
Why Choose a Non-Standard Hydraulic Cylinder?
Most industrial machinery — particularly metallurgical equipment, custom press lines, material handling systems, and OEM production machines — has space constraints, load profiles, and duty cycles that no off-the-shelf cylinder can optimally serve. Non-standard manufacturing allows engineers to:
- Match exact envelope dimensions (bore, stroke, retracted and extended length)
- Achieve the precise working pressure for the load without over-engineering
- Select seal materials appropriate for the operating temperature and fluid type
- Specify mounting flanges, clevis eyes, or trunnions to interface directly with existing structures
- Apply surface treatments (hard chrome, electroless nickel, PTFE coating) to resist corrosion or wear
Key Parameters That Define a Custom Hydraulic Cylinder
When ordering a non-standard hydraulic cylinder, you need to specify the following parameters:
- Bore diameter (ID) — The inside diameter of the cylinder tube, which determines the thrust force at a given pressure.
- Rod diameter — The diameter of the piston rod; larger rods handle higher column loads and buckling resistance.
- Stroke length — The total travel distance of the piston from fully retracted to fully extended.
- Working pressure — The maximum continuous operating pressure (bar or PSI).
- Mounting style — Front flange, rear flange, side lugs, clevis, trunnion, or foot mounting.
- Port size and position — The thread size and location of hydraulic inlet/outlet ports.
- Seal material — NBR, FKM (Viton), polyurethane, or PTFE depending on temperature and fluid.
- Surface finish — Hard chrome plating on rod, honing specification on bore (typically Ra 0.2–0.4μm).
How Wuxi Hengshui Manufactures Non-Standard Cylinders
Wuxi Hengshui Machinery Co., Ltd. specialises entirely in non-standard custom hydraulic cylinder manufacturing. Our production process begins with your drawings (DWG, DXF, PDF, STEP) or a physical sample, and proceeds through:
- Engineering review and drawing confirmation
- Raw material procurement (Huai Steel tube, Tianjin Seamless pipe)
- CNC rough and finish machining
- Precision honing to Ra 0.2μm
- Component cleaning and assembly with Merkel or Parker seals
- 100% hydrostatic pressure test at 1.5× rated working pressure
- Surface coating, packing, and export shipment
MOQ is 1 piece. Lead time is typically 15–25 working days. Contact our sales team at sales@wx-hxy.com with your drawings or specifications for a free quotation within 24 hours.