Large-bore tie-rod hydraulic cylinders – EPG series

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Designed for smooth operation

Big Bore Tie Rod Cylinders are ready for the toughest jobs in the world. These EPG series cylinders are constructed with extra heavy-duty materials and smart design features for optimum performance and longevity.

  • Construction – Ultra heavy-duty
  • Design – Designed for smooth operation
  • Maintenance – Easy and affordable to service

Advanced design features

Conical cushioning valve improves cushioning for a smoother experience than stepped. Captive bumper screws prevent accidental removal while still allowing full adjustment. The yield strength of the threaded body flange is 22% higher than that of the weld material, which increases shear safety.

Durable and dependable

High yield strength tubes and pistons, rolled tie rod threads, and steel heads and covers create an incredibly durable cylinder. Nitrided steel bearings ensure higher load capacity, longer service life, and excellent corrosion resistance.

The most comprehensive selection on the market

Our standard bores range from 254mm to 762mm (10″ to 30″), and we offer stroke lengths up to 7,620mm (300″). Need a custom bore or a longer stroke length? No problem.

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.