Dayco 108581 3/4" JIC to 3/4" SAE O-Ring Boss Hydraulic Swivel Coupling

The Dayco 108581 is a hydraulic swivel coupling designed to connect fluid power lines using a 12RJ4-12SB configuration — a 3/4" JIC (37° flare) female swivel on one end mated to a 3/4" SAE O-Ring Boss (ORB) male on the other. This fitting type is widely used in mobile hydraulics, agricultural equipment, construction machinery, and industrial fluid power systems.

Key Features:

• 12RJ4 End: 3/4" female JIC (37° flare) swivel nut — provides a leak-resistant, high-pressure connection to JIC-style hydraulic lines
• 12SB End: 3/4" male SAE O-Ring Boss (ORB) port — seals via a face-seating O-ring for reliable zero-leak performance
• Swivel design allows for easy installation and alignment without twisting the hose or line
• Constructed of steel with a finish suited for demanding hydraulic environments
• Compatible with hydraulic oil, petroleum-based fluids, and common hydraulic system media
• Dayco quality engineering ensures dimensional accuracy and pressure-rated performance

The Dayco 108581 swivel coupling is an essential adapter for plumbing hydraulic circuits where a JIC hose end must mate to an SAE O-Ring Boss port. Its swivel feature simplifies routing and reduces installation stress on adjacent fittings and hoses.