Cat 5K-5959 O-Ring Seal – NBR/Nitrile – 1.975" ID

Genuine Cat 5K-5959 O-Ring Seal designed to provide a reliable, fluid-tight seal in Cat engines and heavy equipment. This O-ring is manufactured from 75A NBR (Nitrile) material for resistance to wear, extrusion, and compression set.

The 5K-5959 is commonly used for sealing coolant line connections and is compatible with a wide range of Cat engines, trucks, construction equipment, and other heavy-duty machinery.

Product Specifications

• Brand: Caterpillar (Cat)
• Part Number: 5K-5959
• Part Number Format: 5K5959
• Type: O-Ring Seal
• Material: NBR / Nitrile
• Hardness: 75A
• Inside Diameter: 1.975" (50.17 mm)
• Cross-Section Diameter: 0.21" (5.33 mm)
• Dash Size: 329
• Application: Sealing / Coolant Line Connections
• Condition: New

Applications

Cat lists the 5K-5959 for numerous applications, including select:

• Cat 3406, 3408, 3408B engines
• Cat 3412 and G3412 engines
• Cat 3508, 3512 and 3516 engines
• Cat 3208 marine engines
• Cat 773, 775 and 777 off-highway trucks
• Cat 963, 973 and 983 track loaders
• Cat D4, D5, D7, D8, D9, D10 and D11 track-type tractors
• Cat 966, 980, 988, 990, 992 and 994 wheel loaders
• Various Cat excavators, motor graders, scrapers, compactors and other equipment

Always verify the part number against your specific machine or engine before ordering.