Cylinder Division


Heavy Duty Roundline Hydraulic Cylinders, Series RDH - Miller Fluid Power

Hydraulic Cylinders, Heavy Duty Roundline —
Miller Fluid Power Series RDH

Series RDH industrial grade heavy duty roundline hydraulic cylinders provide extremely long cycle life and are field-repairable. 3,000 psi rated Series RDH is configurable in 9 standard mounts, strokes to suit your needs and many standard options.

Miller Fluid Power Series RDH industrial grade roundline welded hydraulic cylinders provide value through proven reliability, efficient performance and the quality that you expect from every Miller Fluid Power Cylinder Division product line. Each Series RDH hydraulic cylinder incorporates design features that are superior in a 3,000 psi roundline welded cylinder. These features include standard composite wear rings both in the head and on the piston, energized bi-directional piston seal and hard chrome plated piston rods.

The Tri-Lip Rod Seal in combination with the Double-Service Wiperseal™ comprises a sealing system that delivers dry rod performance.The one-piece piston is piloted to the piston rod and sealed with an O-ring to eliminate oil bypass through the joint. Anti-extrusion design o-ring Body End Seals provide leak-free service. Magnetic piston for actuating Miller Fluid Power ALS switches through carbon steel cylinders and EPS or CLS sensors are available for stroke position sensing. Port mounted counterbalance valves add versatility by offering hose break protection, preventing loads from drifting and controlling overrunning loads.

Every Series RDH cylinder is individually tested before leaving our plant to assure proper performance and leak-free operation. All Miller Fluid Power cylinder products carry an eighteen month warranty.


  • Energy
  • Industrial
  • Natural Resources
  • Processing


  • Tri-Lip Rod Seal for positive no-leak sealing
  • Non-metallic wear rings at both head and piston
  • Optional magnetic piston and switches for position sensing
  • Port mounted counterbalance valves for cylinder control
  • Every cylinder tested to assure reliability
  • 18 month warranty


  • Energy Production, Development and Service
  • Power Generation
  • Factory Automation
  • Mining
  • Oil and Gas
  • Lumber and Wood