Features
Pressure & Performance
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Temperature
Features
Pressure & Performance
Temperature
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Fenitsa meets the needs and requirements of the machinery manufacturing sector, especially in pneumatics, to the maximum extent possible.
Some of the images and videos used on the site were created with the help of artificial intelligence.
What Is a Tie-Rod Hydraulic Cylinder?
A tie-rod hydraulic cylinder is built from a honed steel tube closed by a front head and a rear cap, held together by four or more external steel tie-rods. The tie-rods carry the separating force created by the oil pressure, so the heads can be bolted rather than welded. That makes tie-rod cylinders easy to dismantle, reseal and re-test, and it allows standardised mounting dimensions — which is why they are the default choice for industrial machinery.
Fenitsa tie-rod cylinders are built to the CETOP R58 standard for 160 bar working pressure (240 bar test, 250 bar option), with bores from Ø40 to Ø200 mm, rods from Ø28 to Ø125 mm and strokes up to 5,000 mm. Adjustable-stroke, double-rod and tandem versions are available.
Construction
| Part | Fenitsa specification | Function |
|---|---|---|
| Cylinder tube | Honed St52 (E355) steel tube | Pressure vessel; smooth bore for piston seals |
| Piston rod | Ck45 steel, hard chrome ≥ 20 µm, f7 tolerance | Transmits force; chrome resists wear and corrosion |
| Heads and caps | Machined steel, clamped by tie-rods | Close the tube, carry ports, rod bearing and mountings |
| Tie-rods | High-tensile steel rods with nuts | Hold the heads against internal pressure |
| Seals | Piston, rod and wiper seals for mineral oil, −20/+80 °C (up to +200 °C option) | Separate chambers and keep dirt out |
| Mountings | Foot, rear joint (clevis), front/rear flange, front/rear trunnion | Connect the cylinder to the machine |
Force Chart at 160 bar
| Bore / rod (mm) | Push kN | Pull kN | Push t | Push lbf |
|---|---|---|---|---|
| Ø40 / Ø28 | 20.1 | 10.3 | 2.1 | 4,520 |
| Ø50 / Ø28 | 31.4 | 21.6 | 3.2 | 7,063 |
| Ø63 / Ø36 | 49.9 | 33.6 | 5.1 | 11,213 |
| Ø80 / Ø45 | 80.4 | 55.0 | 8.2 | 18,080 |
| Ø100 / Ø56 | 125.7 | 86.3 | 12.8 | 28,250 |
| Ø125 / Ø70 | 196.3 | 134.8 | 20.0 | 44,141 |
| Ø160 / Ø90 | 321.7 | 219.9 | 32.8 | 72,321 |
| Ø200 / Ø125 | 502.7 | 306.3 | 51.3 | 113,001 |
Values are theoretical (F = P × A). Allow a 20–30 % margin and check rod buckling for long push strokes — or use the hydraulic cylinder force calculator.
Mounting Styles and When to Use Them
| Mounting | Load path | Typical use |
|---|---|---|
| Front flange | Rigid; best for push loads | Presses, clamping |
| Rear flange | Rigid; best for pull loads | Lifting, pulling |
| Foot | Side-mounted; creates bending moment on the mounting bolts | Machine beds, horizontal motion |
| Front / rear trunnion | Pivots in one plane | Loads that move through an arc |
| Rear joint (clevis) | Pivots at the rear | Levers, gates, platforms |
| Rod end / rod eye | Pairs with a pivot mounting to avoid side load | Any pivoting application |
Side load is the main enemy of rod bearings and seals. With pivoting loads, combine a pivot mounting at the rear with a rod eye or spherical rod end. See our mounting equipment.
Tie-Rod vs Welded Cylinders
| Tie-rod | Welded | |
|---|---|---|
| Assembly | Heads clamped by external rods | End cap welded, head threaded or bolted |
| Serviceability | Very easy to dismantle and reseal | Possible, but more work |
| Size | Larger outside envelope | Compact, no external rods |
| Standard dimensions | Yes (CETOP / ISO 6020 family) | Mostly manufacturer-specific |
| Best for | Industrial machines, presses, automation | Mobile, agricultural and construction machines |
Options
Adjustable stroke limits travel mechanically for fine-tuning a machine. Double rod versions have a rod through both heads for equal area — and equal speed and force — in both directions. Tandem cylinders put two pistons in line to increase force from the same bore. For anything outside the series, see custom hydraulic cylinders.
Tie-Rod Hydraulic Cylinders – FAQ
What is a tie-rod hydraulic cylinder?
A hydraulic cylinder whose front and rear heads are clamped to the tube by external high-tensile steel rods (tie-rods) running along its length. The rods hold the assembly together against the internal pressure, so no welding is needed and the cylinder can be taken apart for service.
What are the advantages of tie-rod cylinders?
Standardised mounting dimensions, easy dismantling for seal replacement, a wide choice of mountings on the same body, and predictable performance in industrial machines. They are the most common design in presses, injection moulding machines and automation.
Tie-rod or welded cylinder — which should I choose?
Choose tie-rod for industrial machines where standard dimensions and easy servicing matter. Choose a welded cylinder for mobile equipment where space is tight, loads are shock-type and a compact body is needed.
Is this a rotary hydraulic cylinder?
No. This page was previously published under the name “rotary”, a mistranslation of the Turkish “rotlu” (with rods). A tie-rod cylinder moves linearly; a rotary actuator turns a shaft. For rotary motion you need a hydraulic rotary actuator or motor.
Which standard do Fenitsa tie-rod cylinders follow?
They are built to the CETOP R58 standard with 160 bar working pressure and 240 bar test pressure; a 250 bar option is available. CETOP RP 58 H is the European recommendation from which the ISO 6020/2 mounting dimensions for 160 bar compact tie-rod cylinders were developed.
Can tie-rod cylinders be repaired?
Yes — that is one of their main advantages. Loosening the tie-rods releases the heads, so seals, bearings and even the rod or tube can be replaced and the cylinder re-tested.
Request a Tie-Rod Cylinder Quote
Send bore, rod, stroke, mounting and quantity — or a drawing of the cylinder you use today — and receive a quotation from our plant in Konya, Türkiye.