Parker 426337504500-625 Polypak Seal 4.5x5.25 in

Product Description

The PARKER 426337504500-625 is a Polypak seal designed for hydraulic and pneumatic cylinder applications where a reliable, low-friction dynamic seal is required. It measures 4.5 inches inner diameter by 5.25 inches outer diameter with a 0.625-inch seal thickness. Rated for operating pressures up to 2000 psi and a temperature range of -20 to 250 degrees F, this seal is well suited for demanding industrial and mobile equipment service. Licensed technicians and maintenance mechanics working on hydraulic cylinders, actuators, and fluid power systems will find this seal a direct-fit replacement for worn or damaged rod and piston seals.

This Polypak seal is intended for use in hydraulic cylinders and fluid power assemblies where a single-acting, pressure-energized seal is needed. The Polypak design is a common configuration in both industrial and mobile hydraulic equipment, including construction machinery, agricultural equipment, and plant maintenance applications. It is suitable for use with 5/8 pipe thread fittings and is compatible with standard hydraulic fluid media within the rated temperature and pressure range.

Key Features

• 4.5 inches ID x 5.25 inches OD x 0.625 inches thick — precise dimensional fit for targeted cylinder bore sizes
• Rated to 2000 psi maximum operating pressure for high-pressure hydraulic service
• Operating temperature range of -20 to 250 degrees F covers a wide range of ambient and fluid temperatures
• Compatible with 5/8 pipe thread fittings
• Polypak seal profile provides reliable dynamic sealing with low breakout friction
• Single-unit packaging allows for individual seal replacement without purchasing a full kit

Compatibility

Designed as an OEM-style replacement Polypak seal for hydraulic cylinders and fluid power actuators requiring a 4.5 inches ID by 5.25 inches OD seal with a 0.625-inch thickness and 5/8 pipe thread interface.

Installation Notes

Installation should be performed by a qualified hydraulic technician or millwright. Fully depressurize and isolate the hydraulic circuit before disassembling any cylinder or actuator. Use a seal installation tool appropriate for the bore size to avoid nicking or rolling the seal lip during assembly. Follow OSHA lockout/tagout procedures and adhere to applicable equipment manufacturer service guidelines.