Parker 426318700875-312 Polypak Seal 0.875 in Id 1.25 in Od

Product Description

The PARKER 426318700875-312 is a Polypak seal designed for dynamic and static sealing applications in hydraulic and pneumatic systems. With a 0.875-inch inner diameter, 1.25-inch outer diameter, and 0.3125-inch thickness, this seal provides a reliable interference fit in standard seal grooves. It is rated for operating temperatures from -20 degrees F to 250 degrees F and handles maximum operating pressures up to 2000 psi. The 5/16-inch pipe thread compatibility suits common hydraulic fittings and actuator bores. Hydraulic technicians and fluid power specialists install this seal during cylinder rebuilds, actuator servicing, and pump maintenance.

This Polypak seal fits residential, commercial, and industrial fluid power assemblies. It is commonly installed in hydraulic cylinders, actuators, and valves where a low-friction, lip-style seal is required to retain fluid under pressure. The -20 degrees F to 250 degrees F temperature rating makes it appropriate for a broad range of indoor and outdoor hydraulic equipment. Its single-piece, self-energizing design simplifies installation in standard seal groove profiles.

Key Features

• 0.875-inch ID and 1.25-inch OD for precise groove fit in standard hydraulic bores
• 0.3125-inch seal thickness for full groove engagement and consistent sealing lip contact
• Rated to 2000 psi maximum operating pressure for demanding hydraulic service
• Temperature range of -20 degrees F to 250 degrees F covers most industrial and mobile hydraulic environments
• Polypak lip-seal design is self-energizing, improving seal performance as system pressure rises
• 5/16-inch pipe thread compatibility for common hydraulic fitting interfaces

Compatibility

Designed as an OEM-style replacement Polypak seal for hydraulic cylinders, actuators, and valves requiring a 0.875-inch ID by 1.25-inch OD by 0.3125-inch thick lip seal rated to 2000 psi.

Installation Notes

Hydraulic technicians should depressurize and bleed the hydraulic system fully before removing the old seal. Inspect the seal groove and bore surface for scoring or burrs that could damage the new seal lip. Lubricate the seal with clean system fluid before installation to avoid lip damage during assembly. Follow applicable fluid power safety standards and equipment manufacturer torque guidance for all hydraulic fittings and end caps.