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Double acting welded hydraulic cylinder for the marine lift

Challenge: Utilizing alternative measures to create a rust proof cylinder for a marine environment.

Pneu-Hyd Industries was commissioned by a customer in the marine industry to design a rugged custom welded hydraulic cylinder able to withstand the demands of the harsh marine environment. This cylinder would mount to a crane positioned on the deck of a ship to lift buoys from the water, and the customer needed a no rust solution. The traditional chrome plated rod we normally provide would not be sufficient; so a special nickel plated rod with a .001" chrome layer was determined to be the best solution over other alternatives. It would offer a superior corrosion resistance to the saltwater environment. The cylinder was constructed from various types of steel, employing CNC machining, saw cutting, and certified welding methods.

The finished cylinder had a long, 58.00” stroke; a 5.50” bore size, and a 2.500” rod featuring a chrome overlay and 100K tensile strength. The closed length of the cylinder was 76.00”, and there was one trunnion mount on the barrel and welded tangs to the blank end and the rod end with a 2.75" pin. Special attachments included multiple port locations for various plumbing configurations, four 3/4 - 16 O-ring boss ports. Operating pressure was 1700 psi, and the unit was completely tested at intervals throughout fabrication as well as after completion to assure quality and accuracy. Turnaround time for this project was 5 weeks, completed to customer specification. For more information about this welded marine application hydraulic cylinder or our other large bore specialty use cylinder manufacturing capabilities please see the table below or contact us directly.


Product Description
Double Acting Welded Hydraulic Cylinder

Capabilities Applied/Processes
  • Engineering Design
  • Saw Cutting
  • CNC Machining & VMC Machining
  • Welding
  • Assembly
  • Chrome Plating - Thickness: 0.001"
  • Induction Hardening

Product Specifications
  • Bore Size - 5.50" Bore
  • Stroke - 58.00" Stroke
  • Rod - 2.500" nickel plated rod with 100K Tensile Strength, 0.001" chrome overlay
  • Closed Length - 76.00"
  • Ports - Four 3/4 - 16 O-ring boss ports
  • Mounts - one trunnion mount on barrel of cylinder
  • Mounts - Rod End - Welded tangs to the blank end and the rod end with a 2.75" pin.
  • Operating Pressure - 3000 PSI

Additional Facts

Special Attachments - Multiple port locations for various plumbing configurations.

Material Used

Various types of steel

In process testing/inspection performed

In process testing at work stations and a final inspection report upon completion

Industry for Use

Marine Crane

Delivery/Turnaround Time

5 weeks from the receipt of approval drawing

Delivery Location


Standards Met

Customer Specifications, 2D CAD Drawing

Product Name

Marine Application Cylinders

In addition to our ISO 9001 designation, we also carry a number of industry recognized certifications.

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