Parker 426312500875-250 Polypak Seal 7/8 X 1-1/8 in

Product Description

The PARKER 426312500875-250 is a Polypak seal designed for use in hydraulic and pneumatic systems requiring reliable dynamic sealing under pressure. This seal measures 7/8 inches inner diameter by 1-1/8 inches outer diameter with a 1/8 inch thickness and is rated for operating pressures up to 2000 psi. The temperature range spans -20 degrees F to 250 degrees F, making it suitable for a broad range of fluid power applications. It is installed by hydraulic technicians, maintenance mechanics, and fluid power specialists as a replacement or service seal in cylinders and actuators.

This Polypak seal is used in hydraulic cylinder and actuator assemblies in both industrial and mobile equipment environments. It performs as a rod or piston seal where a compact, energized lip seal profile is required. The 1/4 pipe thread reference in the product data suggests compatibility with fittings or ports of that size. Applications span light industrial machinery, fluid power circuits, and maintenance repair operations where standard Polypak geometry is specified.

Key Features

• 2000 psi maximum operating pressure for demanding hydraulic service
• Temperature range of -20 degrees F to 250 degrees F covers most industrial fluid media
• Compact Polypak profile provides energized lip sealing in limited-space cylinder bores
• 7/8 inches ID x 1-1/8 inches OD x 1/8 inches thick for precise dimensional fit
• Single-piece packaging suits individual service and repair jobs

Compatibility

Designed as an OEM-style replacement Polypak seal for hydraulic cylinders and actuators requiring a 7/8 inches ID by 1-1/8 inches OD by 1/8 inches thick seal rated to 2000 psi.

Installation Notes

Installation should be performed by a qualified hydraulic technician or fluid power mechanic. Depressurize and isolate the hydraulic circuit completely before disassembly. Lubricate the seal with compatible hydraulic fluid before installation to avoid lip damage during insertion. Follow the equipment manufacturer's service manual for proper groove dimensions and assembly sequence.