Hansen FD49 Series
Flat Face Couplings
Danfoss Hansen FD49 Series flat face couplings were developed for hydraulic tool service around HTMA and NFPA T3.20.15 requirements, combining Twin-Guard sealing, flush face performance, and connect-or-disconnect capability against pressure up to 500 psi.
Flat face couplings for hydraulic tool circuits and service hookups
The FD49 Series is built for hydraulic tool applications where cleaner disconnects, durable sealing, and dependable connection under moderate residual pressure all matter. Its flush face layout helps reduce fluid loss and contamination, while the Twin-Guard seal system is intended to control low-pressure weepage during demanding field use.
Product Features
Hydraulic Tool Focus
FD49 was developed around HTMA hydraulic tool service and NFPA T3.20.15 expectations for compact, flat face quick disconnect performance.
Twin-Guard Sealing
Twin-Guard sealing is used to help manage low-pressure weepage while supporting a cleaner, flush face connection profile.
Against-Pressure Capability
The series is designed to support connection or disconnection against residual pressure up to 500 psi in the intended service conditions.
FD49 operating profile
| Body Size | Max Operating Pressure | Min Burst Pressure Connected | Vacuum | Rated Flow | Air Inclusion | Fluid Loss |
|---|---|---|---|---|---|---|
| 3/8 | 207 bar / 3,000 psi | 621 bar / 9,000 psi | 28 in./Hg | 38 lpm / 10 gpm | 0.01 cc max. | 0.02 cc max. |
Seal layout and pressure-use guidance
The Danfoss TwinGuard seal system uses channels and Buna-N O-rings to help manage low-pressure weepage while supporting the FD49 flush face connection design.
- FD49 is intended to support connection or disconnection against residual pressure up to 500 psi.
- Use should follow the service conditions established for hydraulic tool circuits and matched FD49 halves.
- Maintaining steady connection force during engagement helps the coupling complete the connection more consistently.
Common applications
- Portable hydraulic tools
- HTMA-style power unit hookups
- Utility and maintenance service circuits
- Mobile or stationary equipment needing flat face dry break connections
FD49 Series flow data
Hansen FD49 Series
| Part Number | Coupling Type | Body Size | Port Size | Nominal Flow Dia. | Thread Size / Style | Fig. | A (in.) | B (in.) | Hex 1 (in.) | Hex 2 (in.) |
|---|---|---|---|---|---|---|---|---|---|---|
| FD49-1000-06-06 | Complete Fitting Socket and Plug | 3/8 | 3/8 | 9/16 | 3/8-18 Female NPT | 1 / 2 | – | – | – | – |
| FD49-1000-08-06 | Complete Fitting Socket and Plug | 3/8 | 1/2 | 9/16 | 1/2-14 Female NPT | 1 / 2 | – | – | – | – |
| FD49-1002-06-06 | Plug/Male | 3/8 | 3/8 | 9/16 | 3/8-18 Female NPT | 1 | 2.62 | – | 1.00 | – |
| FD49-1001-06-06 | Socket/Female | 3/8 | 3/8 | 9/16 | 3/8-18 Female NPT | 2 | 2.74 | 1.20 | 1.00 | 1.06 |
| FD49-1002-08-06 | Plug/Male | 3/8 | 1/2 | 9/16 | 1/2-14 Female NPT | 1 | 2.75 | – | 1.06 | – |
| FD49-1001-08-06 | Socket/Female | 3/8 | 1/2 | 9/16 | 1/2-14 Female NPT | 2 | 2.85 | 1.20 | – | 1.06 |
| FD49-1004-08-06 | Plug/Male | 3/8 | 3/4 | 9/16 | 3/4-16 Female SAE O-Ring | 1 | 2.75 | – | 1.06 | – |
| FD49-1005-08-06 | Socket/Female | 3/8 | 3/4 | 9/16 | 3/4-16 Female SAE O-Ring | 2 | 2.82 | 1.20 | – | 1.06 |
| FD49-1057-06-06 | Plug/Male | 3/8 | 9/16 | 9/16 | 9/16-18 Male SAE O-Ring | 3 | 2.99 | – | 1.00 | – |
| FD49-1014-06-06 | Socket/Female | 3/8 | 9/16 | 9/16 | 9/16-18 Male SAE O-Ring | 4 | 3.22 | 1.20 | 1.00 | 1.06 |
| FD49-1057-08-06 | Plug/Male | 3/8 | 3/4 | 9/16 | 3/4-16 Male SAE O-Ring | 3 | 2.99 | – | 1.00 | – |
| FD49-1014-08-06 | Socket/Female | 3/8 | 3/4 | 9/16 | 3/4-16 Male SAE O-Ring | 4 | 3.22 | 1.20 | 1.00 | 1.06 |
Need help matching an FD49 coupling or accessory?
If you are trying to match an existing FD49 flat face coupling, verify a thread configuration, or confirm the right dust protection option for a hydraulic tool setup, we can help narrow it down.
Contact Us