Hansen HKFR Series BOP Couplings
Danfoss Hansen HKFR Series quick disconnect couplings are built for hazardous Blow Out Preventer service in the oil and gas industry, pairing ISO 7241-1 Series B interchange with API 16D-oriented fire-test certification.
Hansen HKFR Series
Hansen HKFR Series couplings are specialized hydraulic quick disconnects for hazardous BOP service where secure shutoff, dependable sealing, and clear field identification matter. The series is designed for oil and gas systems that demand rugged construction and a proven fire-test pedigree.
The HKFR platform meets or exceeds ISO 7241-1 Series B interchange requirements and is offered in zinc trivalent plated steel and 316 stainless steel configurations. Standard sleeve lock protection and red BOP identification markings help support safer operation in critical service environments.
Key Features
- Designed for hazardous Blow Out Preventer (BOP) hydraulic service
- Meets or exceeds ISO 7241-1 Series B interchange standards
- Lloyd’s Register certification for fire conditions referenced to API 16D
- Standard sleeve lock helps prevent accidental disconnection
- Red BOP identification on socket and plug halves for fast visual recognition
- Standard seal material: Nitrile (NBR)
- Standard body materials: zinc trivalent plated steel and 316 stainless steel
- Utilizes HK Series dust caps and dust plugs
Certification Notes
All listed HKFR couplings carry Lloyd’s Register certification for fire conditions stated in API 16D. The couplings are qualified to maintain pressure when exposed to 700 degrees C (1,300 degrees F) for five minutes in the connected condition.
Connected-condition certification test pressures: 4HKFR/4KFR at 206 bar (3,000 psi), 6HKFR/6KFR at 206 bar (3,000 psi), and 8HKFR/8KFR plus ML8HKFR/ML8KFR at 275 bar (4,000 psi).
Common Applications
Oil & Gas
- Blow Out Preventer systems
- Rig hydraulic circuits
- Pressure control equipment
- Well servicing units
Critical Service
- Hazardous hydraulic service
- Fire-test certified connections
- Safety-critical fluid transfer
- Field-service replacement programs
Material Options
- Zinc trivalent plated steel
- 316 stainless steel options
- Matching HK dust caps and plugs
- Nitrile-sealed standard configurations
Physical Characteristics
| Series | Body Size (in) | Max Operating Pressure (bar) | Max Operating Pressure (psi) | Min Burst Pressure (bar) | Min Burst Pressure (psi) | Rated Flow (lpm) | Rated Flow (gpm) | Fluid Loss (cc max.) |
|---|---|---|---|---|---|---|---|---|
| 4HKFR | 1/2 | 482 | 7,000 | 1,931 | 28,000 | 28 | 7.5 | 3.5 |
| 6HKFR | 3/4 | 344 | 5,000 | 1,251 | 18,150 | 66 | 17.5 | 9.3 |
| 8HKFR | 1 | 344 | 5,000 | 1,379 | 20,000 | 95 | 25 | 16.9 |
| ML8HKFR | 1 | 344 | 5,000 | 1,379 | 20,000 | 95 | 25 | 16.9 |
Source data taken from Danfoss Hansen HKFR catalog references for connected-condition operation and certification information.
HKFR Series Part Numbers
Below are core Hansen HKFR Series socket and plug configurations commonly used for BOP service. Contact us for certification details, matching accessories, and availability by material.
Sockets (Female)
Use the diagram as a quick reference for socket dimensions:
- A = Overall Length
- B = Body Length
- HEX = Wrench Size
Plugs (Male)
Use the diagram as a quick reference for plug dimensions:
- C = Overall Length
- D = Body Length
- E / HEX = Nose / Wrench Size
Dust Plugs and Dust Caps Accessories
HKFR couplings use matching HK Series dust caps and dust plugs by body size.
Use the diagram as a quick reference for HK dust cap and dust plug accessories.
- Match the accessory series to the coupling body size.
- Metal and vinyl options are shown below.
- HKFR uses the same HK accessory family for equivalent sizes.
| Coupling Series | Plug Dust Cap Metal | Plug Dust Cap Vinyl | Socket Dust Plug Metal | Socket Dust Plug Vinyl |
|---|---|---|---|---|
| 4HK / 4HKFR | XPDC4HK* | XPPDC4HK(RD) | SDC4HK* | XPSDC4HK(RD) |
| 6HK / 6HKFR | XPDC6HK* | XPPDC6HK(RD) | SDC6HK* | XPSDC6HK(RD) |
| 8HK / 8HKFR | XPDC8HK* | XPPDC8HK(RD) | SDC8HK* | XPSDC8HK(RD) |
* Aluminum accessory body