Parker 426318701125-312 Polypak Seal 1-1/8 Id 1-1/2 Od

Product Description

The PARKER 426318701125-312 is a Polypak seal designed for use in hydraulic and pneumatic systems where reliable dynamic sealing is required. With an inside diameter of 1-1/8 inches, an outside diameter of 1-1/2 inches, and a cross section of 3/16 inches, this seal provides a precise fit in standard gland applications. The seal depth is 5/16 inches and the part is rated for an operating temperature range of -20 to 250 degrees F. Licensed hydraulic technicians, millwrights, and fluid-power mechanics typically specify this seal during cylinder rebuilds and actuator maintenance work.

This Polypak seal is suited for single-acting hydraulic cylinder and actuator applications where a low-friction, pressure-energized lip seal is preferred over a traditional O-ring. The profile allows the seal to be self-energizing under system pressure, maintaining consistent contact across a wide pressure range. It is appropriate for both industrial hydraulic equipment and mobile fluid-power systems operating within the rated temperature and pressure limits.

Key Features

• Inside diameter: 1-1/8 inches for precise gland fit
• Outside diameter: 1-1/2 inches
• Cross section: 3/16 inches with 5/16 inches seal depth
• Maximum operating pressure: 2000 psi
• Temperature range: -20 to 250 degrees F
• Polypak lip-seal profile provides pressure-energized sealing action

Compatibility

Designed as an OEM-style replacement Polypak seal for hydraulic cylinders and actuators requiring a 1-1/8 inches ID by 1-1/2 inches OD seal groove with a 3/16 inches cross section.

Installation Notes

Installation should be performed by a qualified hydraulic technician with the system fully depressurized and isolated from all pressure sources before disassembly. Lubricate the seal lightly with the system fluid before installation to avoid lip damage during insertion. Avoid using sharp tools or metal scrapers in the gland area, as nicks in the bore or seal lip will cause premature leakage. Verify gland dimensions against the seal specifications before assembly.