CAT 171-1879: 1" HEXAGONAL FITTING ADAPTER

The CAT 171-1879 is a Caterpillar hexagonal fitting adapter used in fluid-carrying systems. Cat identifies this part as a 9/16 inch x 1/4 inch fluid-carrying straight adapter designed to meet or exceed industry requirements for operating pressure, assembly, torque capability, and corrosion protection.

Specifications

• Manufacturer: Caterpillar / CAT
• Part Number: 171-1879
• Part Type: Hexagonal fitting adapter / fluid-carrying straight adapter
• Adapter Size: 9/16 inch x 1/4 inch per Cat product listing
• Related Seal for Transmission and Hydraulic Oil: 3J-1907, 9/16-18
• Related Seal for Oil and Fuel: 214-7568, 9/16-18
• Related Seal for Coolant and Urea: 6V-3250, 9/16-18
• System: Fluid lines, adapters, couplings, and fittings

Key Features

• Genuine Cat fitting adapter for compatible fluid-carrying systems.
• Hexagonal body supports wrench engagement during installation.
• Designed for pressure, torque, assembly, and corrosion-resistance requirements.
• Useful for maintenance work on hydraulic, oil, fuel, coolant, or urea-related lines where specified.

Cross References

• Primary CAT part number: 171-1879.
• Confirm seal selection by fluid type and Cat parts documentation before installation.

Machine Compatibility

• Cat listing notes no current compatibility information for this part.
• Verify by machine serial number, system schematic, and adapter thread requirements.

Typical Applications

• Fluid line service and repair.
• Hydraulic adapter replacement.
• Oil, fuel, coolant, or urea line connection work where compatible.
• Caterpillar service parts inventory.

Search Keywords

CAT 171-1879 fitting adapter, Caterpillar 1711879 hexagonal fitting adapter, Cat 9/16 x 1/4 straight adapter, Cat fluid carrying adapter.

CAT hydraulic fitting, Caterpillar adapter fitting, heavy equipment fluid line adapter, HRS Supplies.