Simplex r556 Hydraulic Cylinder 55 Ton 6.19 in Stroke

Product Description

The SIMPLEX r556 is a single-acting, general purpose hydraulic cylinder rated at 55 tons (489.3 kN) capacity with a 6.19-inch stroke. Built for industrial applications, it delivers controlled linear force in one direction and relies on an external load or spring for return. The cylinder features a threaded collar for flexible fixturing, a positive internal stop that limits piston travel at end of stroke, and a wiper seal that extends service life by keeping contaminants out of the cylinder bore. Licensed hydraulic technicians and industrial maintenance crews are the primary installers of this unit.

The r556 belongs to the SIMPLEX R-Series line, which spans a wide range of tonnages and stroke lengths for general purpose industrial use. Typical applications include structural lifting, pressing, pushing, pulling, and maintenance jacking in industrial facilities, fabrication shops, and heavy construction environments. The threaded collar design opens up additional fixturing options compared to smooth-barrel cylinders, making this unit adaptable across a broader set of tooling setups and work-holding configurations.

Key Features

• 55-ton (489.3 kN) rated capacity for heavy industrial lifting and pressing tasks
• 6.19-inch stroke provides substantial travel range for general purpose applications
• Single-acting design delivers force on the advance stroke; retraction relies on load or external return force
• Threaded collar construction allows versatile fixturing and expanded application possibilities
• Positive internal stop limits piston travel at end of stroke, protecting the cylinder from overextension
• Wiper seal reduces contamination ingress and extends cylinder service life

Compatibility

Designed as an OEM-style replacement or direct-use hydraulic cylinder for general purpose industrial single-acting hydraulic systems requiring 55-ton capacity and a 6.19-inch stroke.

Installation Notes

Installation should be performed by a qualified hydraulic technician familiar with high-pressure hydraulic systems. Always depressurize and bleed the hydraulic circuit completely before connecting or disconnecting the cylinder. Ensure all hydraulic fittings are rated for the system operating pressure and are compatible with the cylinder port thread type before assembly. Secure the cylinder in a stable, aligned position to prevent side-loading, which can damage seals and reduce service life.

Technical Specifications

• Capacity: 55 tons (489.3 kN)
• Stroke: 6.19 inches (157.2 mm)
• Cylinder Action: Single-Acting
• Series: R-Series
• Application Type: General Purpose Industrial

Standard Information

• Brand: SIMPLEX
• Manufacturer Part Number: r556