Welded Hydraulic Cylinders

Welded hydraulic cylinders have their cap and mountings welded directly to the barrel, giving a compact, rigid and shock-resistant body. They are the standard choice for mobile hydraulics such as excavators, loaders, cranes, tippers and agricultural machinery.

Fenitsa builds welded body cylinders to OEM drawings with custom mountings, ports and strokes.

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Welded hydraulic cylinder

Welded vs Tie-Rod Cylinders

Welded and tie-rod cylinder comparison
FeatureWelded bodyTie-rod
EnvelopeCompact, no external rodsLarger due to tie rods
Shock and vibrationExcellentGood
MountingsFully custom, weldedStandard ISO mountings
ServiceabilityHead removable, cap weldedFully dismountable
Typical marketMobile equipment, OEMIndustrial machinery

How We Build Them

  1. 1

    Engineering

    Load, buckling and pressure checks on your drawing.

  2. 2

    Barrel and rod

    Honed tube and hard-chromed, induction-hardened rod.

  3. 3

    Welding

    Cap, port bosses and mountings welded and inspected.

  4. 4

    Machining and assembly

    Head, piston and seals assembled to specification.

  5. 5

    Testing

    Every cylinder is pressure and leak tested before shipment.

Applications

  • Excavators and loaders

    Boom, arm and bucket cylinders.

  • Cranes and lifts

    Luffing, outrigger and telescopic boom cylinders.

  • Tippers and trailers

    Tipping and steering cylinders.

  • Agricultural machinery

    Front loaders, balers and implements.

What to Send for a Quote

  • Drawing or sampleOr bore, rod, stroke and closed length.
  • PressureWorking and peak pressure.
  • Mountings and portsPin sizes, port threads and orientation.
  • QuantityPrototype and series volumes.

Design Considerations

What makes a welded cylinder last.

Weld quality. The cap-to-barrel weld carries the full cylinder force on every stroke. Joint preparation, welding procedure and post-weld inspection determine fatigue life, especially on excavator and loader cylinders that see millions of load cycles.Heat and distortion. Welding near the honed bore can distort the tube. Welds are positioned and sequenced so the bore stays within tolerance, and critical cylinders are checked after welding.Rod and bearing length. Mobile cylinders see side loads from machine deflection. A generous bearing length between the piston and the head, and a correctly sized induction-hardened, chrome-plated rod, protect the seals and prevent rod bending.Testing. Each cylinder is pressure tested above working pressure and checked for internal and external leakage before shipment.

Mounting Options

  • Cross tube / pin eye

    Most common on mobile equipment; accepts bushings or spherical bearings.

  • Clevis

    Two-sided pin connection for high loads.

  • Trunnion

    Welded trunnion on the barrel reduces buckling length on long strokes.

  • Flange or feet

    Fixed mounting for linear push applications.

  • Threaded rod end

    Accepts rod eyes or customer attachments.

  • Custom brackets

    Welded to your drawing.

Typical Materials

Welded cylinder materials
PartMaterial
BarrelE355 (ST52) honed seamless tube
RodC45 induction-hardened, hard-chrome plated
Cap, head, pistonC45 / S355 steel
SealsPU, NBR, PTFE or FKM depending on duty and temperature

Welded Cylinders Built to Your Drawing

Send your drawing; we reply with a technical review, price and lead time.

Custom CylindersHydraulic Cylinder ManufacturerTie-Rod Cylinders
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Welded Cylinder FAQ

What is a welded hydraulic cylinder?

A cylinder whose cap (and often the port bosses and mountings) is welded directly to the barrel instead of being clamped with tie rods. The result is a compact, rigid body that tolerates shock and vibration.

Welded vs tie-rod: what is the difference?

Welded cylinders are more compact and robust and allow custom mountings; tie-rod cylinders follow ISO dimensions and are easier to service in the field. Mobile equipment usually uses welded designs, industrial machines often tie-rod.

Can welded cylinders be repaired?

Yes. The head is usually threaded or bolted, so seals, rod and piston can be replaced. Only the barrel-cap weld is permanent.

Do you build welded cylinders to drawing?

Yes. We build to your drawing or sample, including special mountings, ports and rod-end threads.