CAT 9J-6252 Cylinder Rod Bearing Cap

CAT 9J-6252 is a genuine Caterpillar hydraulic pipe thread protection cap/dust cover. It is suitable for hydraulic system pipe fittings, ports, or valve core ends, preventing dust, moisture, and impurities from entering and causing seal failure or component wear. The following are precise original factory specifications and application information; replacement parts are not included.

Core Technical Parameters

Item Details
Part Model: CAT 9J-6252 (Pipe Thread Protective Cap, Internal Thread Dust Cover)

Material: Nitrile rubber (NBR) + steel core, rubber hardness Shore A 70±5, steel core is Q235 carbon steel, surface galvanized and passivated

Key Dimensions: Compatible thread specifications 1/2″-14 NPT (internal thread), outer diameter 28.5 mm, height 18.0 mm, thread length 12.0 mm, sealing lip thickness 2.0 mm

Performance Parameters: Operating temperature -30℃ to +100℃, oil resistance compatible with CAT special hydraulic oil, waterproof rating IP67, anti-aging performance ≥ 5 years (at room temperature)

Single Weight: Approx. 0.02 kg (0.044 lbs)

Tolerance Standards: Thread tolerance 6H, outer diameter tolerance ±0.1 mm, height tolerance ±0.2 mm, sealing lip thickness tolerance ±0.1 mm

Core Features A steel core support ensures the strength of the threaded connection, while a rubber sealing lip tightly fits the pipe fitting end face to prevent impurities from entering, suitable for static protection conditions in hydraulic systems.

Structure and Core Characteristics

Composite Structure Design: The outer layer of nitrile rubber provides elastic sealing and cushioning, while the inner steel core enhances the strength of the threaded connection, preventing stripping or deformation during installation, suitable for the thread protection requirements of hydraulic pipe fittings.

NBR Rubber Material: Resistant to hydraulic oil, wear-resistant, and anti-aging, suitable for the harsh operating conditions of engineering machinery hydraulic systems, protecting the pipe fitting threads and sealing surface from damage.

Precise Thread Fit: The internal thread precisely matches the 1/2″-14 NPT pipe fitting, and the sealing lip tightly fits the fitting end face, forming double protection and effectively blocking dust, moisture, and impurities from entering.

Easy Installation and Removal: The elastic rubber design allows for quick manual tightening or disassembly without special tools, suitable for rapid protection needs during equipment maintenance.

Compatible Models and Application Scenarios

Compatible Equipment: CAT 320, 325, and 330 series excavators, 950, 966, and 972 series loaders, and the hydraulic piping systems of some bulldozers and graders, such as the main hydraulic circuit, pilot hydraulic circuit, and hydraulic pipe joints of the working device.

Core Purpose: Installed at the end of hydraulic pipe joints not connected to pipelines, or at oil ports after disassembly during maintenance, to prevent dust, moisture, and impurities from entering the hydraulic system, protecting seals and valve cores, avoiding hydraulic oil contamination, and reducing the risk of system failure.