Parker 426312501000-250 Polypak Seal 1in Id 1-1/4in Od

Product Description

The PARKER 426312501000-250 is a Polypak seal designed for hydraulic and pneumatic systems requiring a reliable, low-friction dynamic seal. It measures 1 inch inside diameter by 1-1/4 inch outside diameter with a 1/8 inch thickness and is rated for operating temperatures from -20 degrees F to 250 degrees F. The seal handles a maximum operating pressure of 2000 psi, making it suitable for demanding fluid power applications. It installs as a rod or piston seal in hydraulic cylinders and actuators and is typically fitted by hydraulic system technicians or maintenance professionals working on industrial or mobile equipment.

This Polypak seal is used in hydraulic cylinders, pneumatic actuators, and fluid power assemblies where a compact, energized lip seal is needed to prevent fluid bypass. Its low-profile design suits tight gland configurations in both industrial machinery and mobile hydraulic equipment. The 1/4 pipe thread reference in the product data indicates compatibility with standard ported housings of that thread size. Applications span industrial maintenance, OEM hydraulic cylinder builds, and field repair of actuators operating within the stated pressure and temperature range.

Key Features

• Rated to 2000 psi maximum operating pressure for reliable performance in high-pressure hydraulic circuits
• Wide temperature range of -20 degrees F to 250 degrees F suits diverse operating environments
• 1 inch ID by 1-1/4 inch OD profile fits standard hydraulic cylinder gland dimensions
• 1/8 inch seal thickness allows installation in compact gland designs
• Polypak lip-seal design provides low breakout friction and consistent dynamic sealing
• Sold individually, allowing single-unit replacement without excess inventory

Compatibility

Designed as an OEM-style replacement Polypak seal for hydraulic cylinders and actuators requiring a 1 inch ID by 1-1/4 inch OD seal with a 1/8 inch thickness and a 1/4 pipe thread housing configuration.

Installation Notes

Installation is performed by hydraulic system technicians or qualified maintenance personnel. Depressurize and isolate the hydraulic circuit fully before disassembling any cylinder or actuator. Lubricate the seal lip with clean system fluid before installation to prevent damage during initial startup. Avoid using sharp tools near the sealing lip, as nicks or cuts will cause immediate leakage under pressure.