Flanges

Caterpillar Hydraulic Flanges for Strong, Reliable High-Pressure Flow

Caterpillar hydraulic flanges are engineered to create secure, leak-free connections for your fluid power systems, handling pressures from 3,000 up to 6,000 PSI depending on the series. Code 61 (standard) flanges typically handle moderate pressures, while Code 62 and Caterpillar’s own series with thicker flange heads are built for the toughest demands up to 6,000 PSI, with a more robust construction for increased safety and longevity. These flanges are commonly used on pumps, motors, and heavy-duty hydraulic lines throughout Caterpillar machinery, ensuring both performance and durability.

Caterpillar flanges use a simple, effective design: a male head with an o-ring groove forms a tight seal against a flat, unthreaded female port, secured with four bolts in a rectangular pattern. The thicker head on Caterpillar-specific options provides extra strength for high-pressure applications, especially on large equipment and pumps where standard flanges might not be enough.

Available in multiple sizes and configurations (such as 1P4576, 1P4577, 1P5765, 1P5766, 5P8077, and 8T9403), each flange is matched to your Caterpillar equipment model for a perfect, worry-free fit. Regular inspection and replacement of flanges help avoid leaks, pressure loss, and potential system failure especially important in construction, mining, and industrial environments.

At Propel Parts, you’ll find a broad selection of high quality replacement hydraulic flanges directly matched to your Caterpillar machine’s requirements. Quick part lookups, expert support, and fast delivery mean you can minimize downtime and maintain hydraulic integrity.

Flanges are connections used in fluid power systems. Code 61 flanges are referred to as standard. They are used for pressure between 3000 and 5000 PSI depending on the size. Code 62 flanges are rated for 6000 psi for all sizes. There also is a series of flanges that have a thicker flange head that are also rated at 6000 psi for all sizes.