Parker Series 3HB Cylinders

Series 3HB Design Improvements Increase Reliability

A) Primary Seal – Polyurethane Tri-Lip Rod Seal is a proven leak proof design – completely self-compensating and self-relieving to withstand variations and conform to mechanical deflection that may occur. Alternative seal materials are
available to suit your application.

B) Secondary Seal – Polyurethane Rod Wiper –wipes clean any oil film adhering to the rod on the extend stroke and cleans the rod on the return stroke.

C) Rod Gland Assembly – Bronze gland is externally removable without cylinder disassembly. Long inboard bearing surface is ahead of the seals assuring lubrication by cylinder operating fluid.

Parker Crown Wiper™ for Series 2HB 1.50" - 6.00" and 3HB 7.00" & 8.00" bore

For environments that contain fine abrasive particulate specify the Crown Wiper option. The Crown Wiper is a proven superior alternative to piston rod end boots or metallic wipers that can ingest particulate. It has a sharp leading edge to effectively clean the piston rod and a beveled shape to prevent contaminant intrusion by channeling it away from the gland. It also acts as a secondary seal to wipe clean any oil film adhering to the rod on the extend stroke.

Parker Series 3HB Heavy Duty Hydraulic Cylinder

Series 2HB 1.50"-6.00" and 3HB 7.00" & 8.00" bore cylinders are envelope pressure rated at 3,000 psi across the entire bore size and mounting style range. Non-tie rod construction with bolt-on gland and robust Tri-Lip rod sealing system offer superior performance. Head and cap are bolted to flanges that are threaded to each end of the cylinder body and offer several lifetime ownership advantages.

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

Standard Specifications

• Heavy Duty Service – ANSI/(NFPA) T3.6.7R3 - 2009
  Specifications and Mounting Dimension Standards
• Standard Construction – Bolted
• Nominal Pressure – 3000 psi¹
• Standard Fluid – Hydraulic Oil
• Standard Temperature – -10°F to +165°F²
• Bore Diameters – 1.50" through 8.00"

• Piston Rod Diameter – 0.625" through 5.500"
• Mounting Styles – 11 standard styles at various application ratings
• Strokes – Available in any practical stroke length
  See @H & EH Family Model Number / How to Order Page for Series @HB & #HB minimum stroke lengths
• Cushions – Optional at either end or both ends of stroke. “Float Check” standard at cap end of 1.50" - 6.00" bore.
• Rod Ends – Four Standard Choices – Specials to Order

¹ If hydraulic operating pressure exceeds 3000 psi, send application data for engineering evaluation and recommendation. See Section H for actual design factors.

² See Section H for higher temperature service.

In line with Parker's policy of continuing product improvement, specifications on this page are subject to change.

Note: Series 2HB and 3HB Hydraulic Cylinders fully meet ANSI/(NFPA) T3.6.7R3 - 2009 Specifications and Mounting Dimension Standards for Square Head Industrial Fluid Power Cylinders.

Available Mounting Styles

Piston Rod End Dimensions

“Special” Thread Style 3
Special thread, extension, rod eye, blank, etc., are also available.
To order, specify “Style 3” and give desired dimensions for KK, A, W or WF.
If otherwise special, furnish dimensioned sketch.

“Special” Thread Style 3
Special thread, extension, rod eye, blank, etc., are also available.
To order, specify “Style 3” and give desired dimensions for KK, A, W or WF.
If otherwise special, furnish dimensioned sketch.

¹ For special WG dimension, specify “Style 3” and give desired dimension for WG. For other changes, place “S” in the
model code, and describe rod end with dimensioned sketch.
² Style 9 stroke restrictions may apply. See Style 9 Minimum Stroke Table on How to Order page for details.