Overview
The Eaton Aeroquip FD40 series quick disconnect coupling delivers dependable fluid transfer in industrial hydraulic and pneumatic applications. Built with steel construction and designed for rapid connection and disconnection without leakage, the FD40 series meets NFPA standard T3.20.15 and HTMA interchange requirements for maximum compatibility across equipment fleets. Whether you’re servicing heavy equipment, agricultural machinery, or mobile hydraulic systems, this coupling provides the reliability industrial technicians depend on.
Key Features
- Self-sealing design: Female half features self-sealing poppet valves to prevent fluid loss during disconnect
- Industrial interchange standard: Meets MIL-C-4109 dimensional specifications and NFPA/HTMA requirements
- Steel construction: Durable steel body engineered for long service life in demanding environments
- Multiple port sizes: Available in 1/4″, 3/8″, and 1/2″ configurations for flexible system design
- NPT threading: Standard National Pipe Thread ensures compatibility with existing hydraulic and pneumatic infrastructure
- Protective collar design: Prevents accidental snagging and disconnection during operation
Technical Specifications
- Series: Eaton Aeroquip FD40
- Material: Steel
- Available Port Sizes: 1/4″ (06), 3/8″ (06), 1/2″ (08)
- Thread Type: Male NPT (National Pipe Thread)
- Connection Style: Straight-through design (male half)
- Sealing Type: Poppet valve (female half)
- Standard Seal Material: Neoprene
- Compliance: NFPA T3.20.15, HTMA Interchange, MIL-C-4109
Typical Applications
The FD40 series serves industrial and mobile applications where quick, reliable fluid connection is essential:
- Heavy equipment hydraulic systems (excavators, loaders, graders)
- Agricultural machinery (tractors, balers, sprayers)
- Mobile power units and equipment
- Machine tool hydraulic lines
- Forestry and construction equipment
- Compressed air service systems
Compatibility & Replacements
Compatible With
- Hydraulic systems rated for NPT connections
- Pneumatic compressed air systems
- Equipment with SAE and ISO 7241-1 Series B specifications
- Industrial machinery requiring NFPA standard couplings
- Mobile equipment and portable power systems
Replaces / Drop-In Replacement For
The FD40 series directly replaces earlier model quick disconnect couplings that meet NFPA T3.20.15 interchange standards. Verify your specific coupling model number and port configuration (part number format: FD40-XXXX-XX-XX) before ordering. Common replaced models include other FD40 part number variants with different port sizes and thread configurations.
Works With
- SAE J345 standard hose and fitting systems
- ISO 7241-1 Series B quick disconnect systems
- Hydraulic hose assemblies (1/4″ to 1/2″ nominal)
- Pneumatic hose and tubing
- NFPA-compliant equipment and machinery
