Which Hydraulic Cylinder Is Best for Pressing Applications?

by | Jul 23, 2026 | single acting cylinder

Choosing the best hydraulic cylinder for a pressing application requires matching the cylinder type, bore size, stroke, and mounting to the force, geometry, and duty cycle of the specific press. Pressing is one of the most force-intensive hydraulic cylinder applications — hydraulic cylinders for pressing must generate high compressive force on the downstroke while maintaining precise position under load and returning reliably for the next cycle. This guide covers every aspect of hydraulic press cylinder selection from force calculation to mount type.

Compact hydraulic cylinder for pallet pressing high compressive force application

Why Single Acting Is Standard for Hydraulic Press Cylinders

A hydraulic press cylinder applies its force in one direction — downward onto the workpiece. Once the pressing operation is complete, the tooling must retract to allow the pressed part to be removed and a new workpiece loaded. In virtually all press applications, the tooling and ram assembly weighs enough that gravity provides reliable and adequate retraction — making a single acting hydraulic cylinder the natural match for the work cycle.

Single acting press cylinders offer additional advantages over double acting: the one-line circuit is simpler and lower cost; the absence of a rod-end port eliminates the risk of rod-end seal damage from press ram flash and debris; and the cylinder body can often be made more compact because no provision for the return pressure line is needed. For small tabletop presses where the ram weighs under 5 kg and gravity return is insufficient, a spring return single acting cylinder bridges the gap without adding a second hydraulic line.

Hollow Plunger vs Piston-Rod for Press Applications

Standard hydraulic press cylinders below 50 tonnes typically use the conventional piston-and-rod design — the same cylinder used in other applications. Above 50 tonnes, the hollow plunger design becomes increasingly preferred for press duty:

Piston-Rod Press Cylinder (< 50 tonnes)

Conventional bore-and-rod design. Rod diameter is smaller than the bore — rod buckling under high compressive load must be checked using Euler’s formula when stroke exceeds 10× rod diameter. Standard stock availability in most bore sizes. Easy to source seal kits.

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Hollow Plunger Press Cylinder (> 50 tonnes)

Plunger diameter equals the force-generating area. The larger diameter provides inherently higher column stiffness — far less susceptible to buckling under high compressive force. No separate piston seal — only one gland seal. Higher force in a more compact cross-section at very high tonnages.

Press Force Reference Table — Bore vs Force at Common Pressures

Bore (mm) Force at 20 MPa (kN / tonnes) Force at 25 MPa (kN / tonnes) Force at 31.5 MPa (kN / tonnes)
80 100.5 kN / 10.2t 125.7 kN / 12.8t 158.3 kN / 16.1t
100 157.1 kN / 16.0t 196.4 kN / 20.0t 247.4 kN / 25.2t
125 245.4 kN / 25.0t 306.8 kN / 31.3t 386.5 kN / 39.4t
160 402.1 kN / 41.0t 502.7 kN / 51.2t 633.4 kN / 64.6t
200 628.3 kN / 64.1t 785.4 kN / 80.1t 989.6 kN / 100.9t
250 981.7 kN / 100.1t 1227.2 kN / 125.1t 1545.2 kN / 157.6t
Heavy duty hydraulic cylinder high tonnage pressing and structural application

Rod Buckling Check for Press Cylinders

Press cylinders operate in compression — the load pushes back against the rod throughout the pressing stroke. This compressive loading creates a buckling risk that increases with stroke length and decreases with rod diameter. For any press cylinder where the stroke exceeds 10 times the rod diameter, a formal buckling check using Euler’s column formula is mandatory. The buckling safety factor must be at least 3.5 under the maximum press force.

A press cylinder that passes the force calculation but fails the buckling check requires either a larger rod diameter (increasing the bore to maintain force output), a shorter stroke (reducing the unsupported length), or an external guide to prevent lateral displacement of the ram. Contact Ever-Power with bore, stroke, rod diameter, and maximum press force for a free buckling safety check before ordering.

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Frequently Asked Questions

1. Which hydraulic cylinder is best for pressing applications?+
For most pressing applications, a single acting hydraulic cylinder — either a standard piston type or a hollow plunger — is the best choice. The pressing work cycle matches single acting perfectly: high force on the downstroke (extension) and gravity or tooling weight for the return stroke. A hollow plunger cylinder is preferred for high-tonnage pressing (above 50 tonnes) because the larger plunger diameter provides greater column stiffness without the rod buckling risk of a conventional piston-rod design at high compressive loads.
2. How much force does a hydraulic press cylinder need?+
Required pressing force depends on the material and process: forming sheet metal requires 50–500 kN per square metre of contact area; bearing press-fitting requires 10–150 kN depending on interference fit and shaft diameter; rubber moulding presses require 5–20 MPa over the mould area; and concrete casting presses require 1–10 MPa over the form area. Calculate bore size from the required force and system pressure: Bore = 2 × √(Force ÷ (π × Pressure)), then apply a 1.5× safety factor to the required force before calculating.
3. Should a press cylinder be single acting or double acting?+
Single acting is standard for most hydraulic press cylinders because pressing force is required only on the downstroke and the tooling weight provides gravity return. Double acting is used when the return stroke must be powered — either because the tooling is too light to fall under gravity, because the return must work against spring resistance, or because the press cycle speed requirement exceeds what gravity return can achieve. A double acting press cylinder adds complexity and cost that single acting avoids for most applications.
4. What bore size hydraulic cylinder do I need for a 20 tonne press?+
For a 20 tonne (196.2 kN) press at 20 MPa system pressure with a 1.5× safety factor: factored force = 294.3 kN; required bore area = 294,300 ÷ 20,000,000 = 0.01472 m²; bore = 2 × √(0.01472 ÷ π) = 136.9 mm → use 160 mm standard bore. At 25 MPa, the required bore reduces to approximately 125 mm standard. Higher system pressure allows a smaller bore for the same press force — relevant when the press frame or bed size is constrained.
5. What is the best stroke length for a press hydraulic cylinder?+
Press cylinder stroke should equal the maximum distance between the tooling closed position and the maximum open gap needed to load and unload the workpiece, plus 10–20 mm clearance at each end. For a press with 200 mm working stroke and 50 mm clearance each end, specify 300 mm stroke. Avoid specifying excessive stroke — long-stroke press cylinders have greater rod buckling risk under high compressive loads and require checking the rod diameter against Euler’s column formula.