Heavy-duty tie-rod hydraulic cylinders – EPN series

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Innovative safety features

Improve the performance and safety of your hydraulic systems with our complete line of tie-rod heavy-duty NFPA cylinders. These N series cylinders are engineered to withstand extreme environmental conditions and constant use for maximum reliability and long life.

  • Safe – Innovative safety features
  • Reliable – Durable and reliable
  • Sizable – Comprehensive size options

Dependable performance

Integral piston rod barrel and self-regulating conical shock valve ensure smoother, safer operation and less downtime.

Engineered with safety in mind

Our captive bumper screws prevent accidental removal while still allowing for full range of adjustments. The yield strength of the threaded body flange is 22% higher than that of the weld material, which increases shear safety.

Made to last

An extra-wide, high-strength wear band runs smoothly within the precision-honed cylinder to extend piston seal life. Rod and barrel assemblies are one-piece unthreaded for maximum bearing support and wear resistance.

Available in the size you need

Our bores range from 1 in (25.4 mm) to 8 in (203 mm) and travel up to 300 in (8 m). Choose from various mounting and port styles to meet your precise application requirements. Can’t find what you need? Let us customize a solution for you.

Tie rod hydraulic cylinder

Tie Rod Cylinders Use high-strength threaded steel rods to secure both end caps to the cylinder barrel. This method of construction is most commonly found in industrial plant applications. Small bore cylinders typically have four tie rods, while larger bore cylinders may require as many as 16 or 20 tie rods to hold the end caps under the enormous forces generated. The National Fluid Power Association (NFPA) has standardized the dimensions of hydraulic tie rod cylinders. This enables cylinders from different manufacturers to be interchanged within the same mount. Tie-rod cylinders can be completely disassembled for servicing and servicing.

Welded body hydraulic cylinder

Welded cylinders have a number of advantages over tie rod cylinders: Welded cylinders have a narrower body, and generally shorter overall lengths allow them to better fit within the tight confines of machinery. Welded cylinders do not fail due to tie rods being stretched under high pressure and long strokes. Welded designs are also suitable for customization. Special features can easily be added to the block; these may include special ports, custom mounts, valve manifolds, and more. The smooth outer body of the welded cylinder also enables the design of multi-stage telescopic cylinders.

Which Material is Best For Hydraulic Cylinder?

The most commonly used material in hydraulic cylinder construction is steel. This material is generally carbon steel. It can withstand hydraulic oil pressure and is available in many different grades. The higher the hydraulic oil pressure, the thicker and stronger the cylinder wall should be. Steel hydraulic cylinders have a long service life and are more durable in acidic environments.
Cylinder barrels are usually made of honed, cold-drawn seamless or rolled tubes. The surface finish of the cylinder barrel is typically 4 to 16 micro inches. Some cylinders may have non-standard threads or welds. In any case, standardization allows for greater versatility and lower costs. The same goes for connecting rod bearings and piston bearings. Standard threads allow for greater accuracy, while under dimensioning may require derating or special tooling. Also, non-standard threads and sizes can be difficult to mate with other cylinder fittings.