Product Description
CAT 8H9520 is a lip-type encased nitrile rubber (NBR) seal designed for heavy-duty industrial applications in CAT equipment. It features a 35.03 mm outside diameter, 7.92 mm axial width, and is compatible with models 815B, 3306, 3408, 3412, and related series. Seal construction conforms to SB (Single Lip, Bonded Type) configuration, manufactured from NBR with 75 durometer hardness. This seal is cross-referenced with CTP 144384 and CTC-8H9520, and included in kit 5R1425.
Specifications
Compatibility
| Compatible With CAT Models | 815B, 3306, 3408, 3412, 3408B |
Material
| Seal Material | Nitrile Rubber (NBR) – 75 Durometer |
| Material Hardness | 75 Shore A |
Part Numbers
| OEM Part Number | 8H9520 |
| Manufacturer Part Number | 8H-9520 |
| Cross-Reference Part Numbers | Supersedes and replaces part numbers: CTP 144384, CTC-8H9520 |
| Equivalent Part Numbers | 8H9520, CTC-8H9520, 144384 |
Frequently Asked Questions
Q: What are the physical dimensions of the CT 8H9520 seal?
A: The CT 8H9520 is a lip-type encased nitrile rubber seal with an outside diameter of 35.03 mm and axial width of 7.92 mm. It is constructed as a single lip bonded type (SB configuration) with 75 durometer NBR hardness. These dimensions make it suitable for heavy-duty industrial applications in CAT engine and equipment assemblies.
Q: Which Caterpillar equipment models are compatible with the CT 8H9520?
A: The CT 8H9520 is compatible with CAT models 815B, 3306, 3408, 3412, and 3408B. Verify that your equipment matches one of these model designations before ordering. This seal is also included in kit 5R1425 for bulk sealing applications.
Q: What cross-reference part numbers should I know for the CT 8H9520?
A: The CT 8H9520 is cross-referenced as CTP 144384 and CTC-8H9520. If you encounter these older part numbers in documentation or inventory systems, they refer to the same seal. The OEM part number is 8H9520, and the manufacturer designation is 8H-9520.
Q: Why is nitrile rubber (NBR) used for this seal, and how durable is it?
A: Nitrile rubber at 75 durometer hardness provides excellent resistance to oil, fuel, and hydraulic fluids common in CAT industrial equipment. The bonded lip construction maintains seal integrity under high pressure and temperature cycling. NBR seals are designed for extended service life in heavy-duty applications but will degrade over time with exposure to ozone and certain synthetic fluids. Replace when visible wear, hardening, or leakage occurs.
