Series 2H / 2HD / 2HB
& 3H / 3HD / 3HB

Heavy Duty Hydraulic Cylinders

Parker heavy duty hydraulic tie rod Series 2H/2HD & 3H/3HD and bolted Series 2HB/3HB cylinders offer highest initial quality, best in class delivery, optimized performance, extended service life, longer intervals between maintenance and improved serviceability.

Series 2HB & 3HB Non-Tie Rod Style with Bolt-On Gland


  • Improved fatigue life compared to welded flange construction
  • Easier to service than tie rod styles in long strokes
  • Clean appearance improves machine aesthetics
  • Lower weight in long strokes

Aligned to industrial market demands

Industrial Markets

Piston Seal Technology for the 21st Century

View Selection Guide
Standard HP

Standard HP style with poly­urethane piston seal – excellent for most cycling and load holding applications.

Optional KP

Optional KP style with filled PTFE piston seal – low friction, high heat resistance for cycling and load holding service.

Optional RP

Optional RP style with thermo­plastic piston seal – superior extrusion resistance to extreme pressure spikes with drift-free performance.

Optional WP

Optional WP style mixed media piston seal – low\friction primary seal with redundant elastomer delivers superior per­for­mance with dissimilar media on either side of the piston.

Series 2H / 3H Design Improvements Increase Reliability

Class 1 service polyurethane rod wiperseal and o-rings as body end seals and rod gland static seal offer superior abrasion and extrusion resistance for longer service life.

High compressive strength non-metallic piston wear rings, that minimize tube scoring, are standard on all configured piston selections.

Cap cushion performance options are selectable as floating check bushing type for normal applications or solid orifice style for more demanding high speed and load operation.

Cartridge style needle valve with captive micro adjust screw for precision cushion tuning.

Washers under each tie rod nut prevent galling, ensuring correct tie rod pre-stress and pressure envelope integrity.

Steel head and cap blocks are precision size, finished on all sides and are bored and grooved for concentric alignment of mating parts.

Piston-to-rod connection is pre-stressed to maximize fatigue life. An o-ring on the piston ID ensures a leak free joint and anaerobic adhesive further secures the threaded connection.

One common piston is used for 4 piston seal styles. When changing operating conditions require a different seal style, the piston and rod assembly is unchanged.