Technical Foundation
What Is a Hydraulic Cylinder?
A hydraulic cylinder converts pressurized hydraulic fluid into linear mechanical force by pushing a piston, connected to a rod, through a sealed cylindrical bore. Bore diameter and system pressure together determine the cylinder's force output (force equals pressure times piston area), so two cylinders with the same bore but different pressure ratings produce very different available force. Tie rod cylinders use external steel rods running the cylinder's length to clamp the end caps to the barrel, making them field-serviceable and the standard for industrial fixed equipment; welded body cylinders have the end caps welded directly to the barrel, producing a more compact, higher-pressure-rated but non-serviceable unit common in mobile equipment.
Double-acting cylinders receive pressurized fluid on both sides of the piston, extending and retracting under hydraulic power in both directions; single-acting cylinders extend under hydraulic pressure but retract via gravity, spring force, or the load itself. Stroke length (the piston's travel distance) plus the cylinder's collapsed length determine the overall envelope needed for mounting, and mounting style (clevis, flange, trunnion, tie rod-end) must suit how the cylinder pivots or is fixed relative to the load it's moving.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Bore Diameter | Sets piston area; combined with pressure = force output | Larger bore at the same pressure produces proportionally more force |
| Stroke Length | Piston travel distance | Must match the required range of motion; affects the cylinder's collapsed and extended overall length |
| Pressure Rating | System working pressure, typically 2000-3000+ psi | Must equal or exceed the hydraulic system's operating pressure with adequate safety margin |
| Construction Type | Tie rod (serviceable) vs. welded body (compact, higher rated) | Tie rod suits fixed industrial equipment needing field repair; welded body suits mobile equipment with space/pressure constraints |
| Mounting Style | Clevis, flange, trunnion, tie rod-end | Determines how the cylinder pivots or is fixed relative to the load and frame |
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Applications
Where Hydraulic Cylinders Get Used
Hydraulic cylinders are specified anywhere linear force needs to be generated from a hydraulic power source for lifting, pushing, clamping or positioning.
Mobile & Off-Highway Equipment
Welded body and telescopic cylinders providing lift, tilt and dump functions on construction and agricultural equipment.
Industrial Presses & Fixed Machinery
Tie rod cylinders in press and clamping applications where field-serviceability matters for uptime.
Material Handling & Lift Equipment
Cylinders providing controlled lift force in forklifts, scissor lifts and other material handling machinery.
Agricultural Equipment
Hydraulic cylinders actuating implements, loaders and steering systems on tractors and field equipment.
Dump Trucks & Trailers
Telescopic cylinders providing the long stroke needed to raise a dump body through its full range without a proportionally long collapsed length.
Manufacturing & Fabrication Equipment
Custom-specified cylinders integrated into production machinery for clamping, pressing and positioning functions.
FAQ
Hydraulic Cylinders Questions, Answered
How do I calculate the force output of a hydraulic cylinder?
Force equals system pressure multiplied by the piston's effective area (area = π times bore radius squared), so a 3-inch bore cylinder at 2000 psi produces roughly 14,137 lbf of extension force. Retraction force is calculated using the smaller annular area on the rod side, since the rod itself takes up part of that end's cross-section — retraction force is always less than extension force for the same pressure on a double-rod-side cylinder.
Should I choose a tie rod or welded body cylinder?
Tie rod cylinders are field-serviceable — seals and internal parts can be replaced by removing the tie rods without cutting the cylinder apart — making them the standard for fixed industrial equipment where downtime for repair matters. Welded body cylinders are more compact and often rated for higher pressure in a smaller envelope, which is why they dominate mobile equipment where space is constrained, but they generally require full replacement or specialized re-machining if they fail.
What's the difference between single-acting and double-acting cylinders?
A double-acting cylinder has hydraulic ports on both sides of the piston, so fluid pressure both extends and retracts it under power. A single-acting cylinder only has a port on one side — hydraulic pressure extends it, but retraction relies on gravity, an external spring, or the load's own weight, which limits it to applications where that passive retraction force is reliably available.
How do I know what stroke length I need?
Stroke length must equal or exceed the actual travel distance required by the application, but also check the cylinder's collapsed (fully retracted) length fits within the available mounting envelope — a longer stroke cylinder has a longer collapsed length too, which can be a bigger constraint than the stroke itself in tight installations. Telescopic cylinders solve this specifically by nesting multiple stages to get a long stroke from a short collapsed length.
Why is my cylinder losing force or drifting under load over time?
The most common cause is worn or damaged internal seals allowing fluid to bypass the piston internally (bypassing seal wear shows up as the rod slowly retracting under a held load even with the valve closed), which is why cylinder seal kits are stocked as standard repair items. External leaks at the rod seal or fittings are a separate and usually more visible symptom, but internal bypass can occur with no visible external leak at all.
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