R Series

Hydraulic Mill-Type Cylinder

Bore Sizes: 4″ – 16″ | Available in pressure ratings of 300 Bar (Metric), 3000 PSI and 5000 PSI 

mill type cylinder

More Features, Less Maintenance, Use the R Series

Designed in response to our customers’ need for a more durable, more reliable product to reduce their replacement and maintenance costs.


  • Reduce design and development costs
  • Extra bearing surface accommodates additional side loading
  • Advanced gland design keeps the cylinder interior clean for increased seal longevity
  • Custom mounts to suit any application
  • Heavy duty construction with steel flanged end caps and heavy wall tubing
  • 4 wrench flats on piston rod + option to accept LDT
  • Extra-long heavy duty rod bushing with dual wipers
  • Made-to-order stroke lengths
  • High pressure rating – well above industry standards
  • Wide ductile iron piston for long bearing
  • Dual buffer rod seals
  • Custom mounts to suit any application
  • Fully backed by Cowan Dynamics’ warranty and service/support guarantee


5000 psi

Bore Size: 4” to 16”
Piston Rod Diameter: 2” to 10”


3000 psi

Bore Size: 4” to 16”
Piston Rod Diameter: 2” to 10”


Metric Cylinder: 300 bar

Bore Size: 40mm to 200mm
Piston Rod Diameter: 22mm to 140mm

Download Our R Brochures

In Market Example

Improving the control of the production of steel plates on a Duo rolling mill.
In Market Example of Mill-Type Hydraulic Cylinder - R Series