HK Series (Stainless Steel)
ISO 7241-1 B Interchange
Fluid transfer & Hydraulic application
Danfoss Hansen HK stainless steel coupling is a general
purpose industrial interchange coupling available in
valved or non-valved designs, offered in 303/316 grades
of stainless steel for excellent corrosion resistance in rugged
applications. The HK Series features a ball latch mecha
nism with automatic self-sealing poppet valves
Product Features
• Meets dimensional requirements to ISO standard
7241-1 Series B
• 303/316 Stainless steel construction for greater corrosion resistance
and uid compatibility
• Self-sealing poppet valves provide excellent high and low pressure
sealing
• Standard body material: 303 or 316 Stainless Steel
• Standard seal material: Nitrile (NBR)
• Seal options available in PTFE, Neoprene, FKM, EPDM, and Kalrez®
European Pressure Equipment Directive
Couplings with nominal diameters up to and including 25 mm
are designed and manufactured under Article 4.3 of the Eu
ropean Pressure Equipment Directive 2014/68/EU. Couplings
with nominal diameters greater than 25 mm are designed and
manufactured in accordance with stipulations of Module A of the
European Pressure Equipment Directive 2014/68/EU. They should
not be used to convey unstable gases.
Group 1 = Hazardous media / Group 2 = Other media
Physical Characteristics
| Series | Body Size (in) | ISO Size (mm) | Nominal Flow Diameter (mm) | Max Pressure Non-Hazardous (bar) | Max Pressure Non-Hazardous (psi) | Max Pressure Hazardous (bar) | Max Pressure Hazardous (psi) | Rated Flow (lpm) | Rated Flow (gpm) | Air Inclusion (cc max.) | Fluid Loss (cc max.) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1HK | ⅛ | 5 | 4.4 | 344 | 5,000 | 344 | 5,000 | 3 | 0.8 | 0.6 | 0.5 |
| 2HK | ¼ | 6.3 | 5.9 | 255 | 3,700 | 255 | 3,700 | 12 | 3 | 1.2 | 0.9 |
| 3HK | ⅜ | 10 | 7.8 | 255 | 3,700 | 255 | 3,700 | 23 | 6 | 2.9 | 2.1 |
| 4HK | ½ | 12.5 | 10 | 293 | 4,250 | 293 | 4,250 | 45 | 12 | 3.6 | 3.5 |
| 6HK | ¾ | 20 | 17 | 242 | 3,500 | 242 | 3,500 | 100 | 26 | 11.5 | 9.3 |
| 8HK | 1 | 25 | 19.6 | 207 | 3,000 | 207 | 3,000 | 189 | 50 | 18.0 | 16.9 |
| 10HK | 1¼** | — | 26.7 | 118 | 1,700 | 37 | 537 | 288 | 76 | 48.0 | 48.0 |
| 12HK | 1½ | 40 | 35.1 | 152 | 2,200 | 29 | 421 | 375 | 99 | 91.3 | 91.3 |
| 20HK | 2½ | 50 | 46 | 104 | 700 | 21 | 305 | 757 | 200 | 209.9 | 209.9 |
* For questions related to vacuum please contact Danfoss.
** No ISO Standard available for the 10HK
Applications & Markets
• Agriculture
• Hydraulic Tool
• General Industry
• Construction
• Fluid Transfer
• Transportation
• Military
• Law Enforcement/Rescue
• Chemical
• Oil and Gas
• Consumer Products
• HVAC
• Food and Beverage
• Trucks
• Aerospace
• Medical
Flow Data
Seal Elastomer Data*
| Seal Elastomer** | Max. Operation Temperature Range |
|---|---|
| Nitrile (NBR) | -40°C to +121°C / -40°F to +250°F |
| Neoprene | -54°C to +100°C / -65°F to +212°F |
| EPDM | -54°C to +149°C / -65°F to +300°F |
| FKM | -29°C to +204°C / -15°F to +400°F |
* For reference only, based on Danfoss recommended temperatures.
** For seals not listed, contact Danfoss.
HK Series (Stainless Steel)
ISO 7241-1 B Interchange
Sockets/Female
| Part Number (303 Stainless) | Part Number (316 Stainless) | Body Size (in) | ISO Size (mm) | Thread Size (NPTF) | Thread Size (BSPP) | Thread Size (SAE) | Fig. | A (in) | B (in) | Across Flats (in) | A (mm) | B (mm) | Across Flats (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LL1H11 | ML1H11 | ⅛ | 5 | ⅛-27 | – | – | 1 | 1.91 | 0.98 | 0.56 | 48.5 | 24.9 | 14.2 |
| LL1H4 | – | ⅛ | 5 | – | – | ⅞-20 | 1 | 2.06 | 0.98 | 0.69 | 52.3 | 24.9 | 17.5 |
| LL2H16 | ML2H16 | ¼ | 6.3 | ¼-18 | – | – | 1 | 2.26 | 1.14 | 0.75 | 57.4 | 29.0 | 19.1 |
| LL2H16BS | ML2H16BS | ¼ | 6.3 | – | ¼-19 | – | 1 | 2.31 | 1.14 | 0.75 | 58.7 | 29.0 | 19.1 |
| LL2H6 | – | ¼ | 6.3 | – | – | ⅞-18 | 1 | 2.40 | 1.14 | 0.88 | 61.0 | 29.0 | 22.4 |
| LL3H21 | ML3H21 | ⅜ | 10 | ⅜-18 | – | – | 1 | 2.56 | 1.42 | 0.88 | 65.0 | 36.1 | 22.4 |
| LL3H21BS | ML3H21BS | ⅜ | 10 | – | ⅜-19 | – | 1 | 2.56 | 1.42 | 0.88 | 65.0 | 36.1 | 22.4 |
| LL3H8 | – | ⅜ | 10 | – | – | ¾-16 | 1 | 2.74 | 1.42 | 1.00 | 69.6 | 36.1 | 25.4 |
| LL4HP26 | ML4HP26 | ½ | 12.5 | ½-14 | – | – | 1 | 2.96 | 1.86 | 1.13 | 75.2 | 47.2 | 28.7 |
| LL4HP26BS | ML4HP26BS | ½ | 12.5 | – | ½-14 | – | 1 | 2.96 | 1.86 | 1.13 | 75.2 | 47.2 | 28.7 |
| LL4HP10 | – | ½ | 12.5 | – | – | ¾-14 | 1 | 3.05 | 1.86 | 1.25 | 77.5 | 47.2 | 31.8 |
| LL6HP31 | ML6HP31 | ¾ | 20 | ¾-14 | – | – | 1 | 3.48 | 2.22 | 1.31 | 88.4 | 56.4 | 33.3 |
| LL6HP31BS | ML6HP31BS | ¾ | 20 | – | ¾-14 | – | 1 | 3.48 | 2.22 | 1.31 | 88.4 | 56.4 | 33.3 |
| LL6HP12 | – | ¾ | 20 | – | – | 1⅛-12 | 1 | 3.67 | 2.22 | 1.38 | 93.2 | 56.4 | 35.1 |
| LL8HP36 | ML8HP36 | 1 | 25 | 1-11½ | – | – | 1 | 4.13 | 2.61 | 1.75 | 104.9 | 66.3 | 44.5 |
| LL8HP36BS | ML8HP36BS | 1 | 25 | – | 1-11 | – | 1 | 4.13 | 2.61 | 1.75 | 104.9 | 66.3 | 44.5 |
| LL8HP16 | – | 1 | 25 | – | – | 1⅜-12 | 1 | 4.13 | 2.61 | 1.88 | 104.9 | 66.3 | 47.8 |
A=Overall Length, B=Maximum Diameter
To obtain connected length of coupling, add dimensions A (Fig. 1) and E (Fig. 3) together.
Sockets/Female
| Part Number | Body Size (in) | ISO Size (mm) | Thread Size (NPTF) | Thread Size (BSPP) | Fig. | A (in) | B (in) | Hex (in) | A (mm) | B (mm) | Hex (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| LL10H41* | 1¼ | – | 1¼-11½ | – | 2 | 4.51 | 2.73 | 2.38 | 114.6 | 69.3 | 60.5 |
| LL10H41BS* | 1¼ | – | – | 1¼-11 | 2 | 4.51 | 2.73 | 2.38 | 114.6 | 69.3 | 60.5 |
| LL12H41 | 1½ | 40 | 1¼-11½ | – | 2 | 4.82 | 3.23 | 2.38 | 122.4 | 82.0 | 60.5 |
| LL12H41BS | 1½ | 40 | – | 1¼-11 | 2 | 4.82 | 3.23 | 2.38 | 122.4 | 82.0 | 60.5 |
| LL12H46 | 1½ | 40 | – | 1½-11½ | 2 | 4.82 | 3.23 | 2.38 | 122.4 | 82.0 | 60.5 |
| LL12H46BS | 1½ | 40 | – | 1½-11 | 2 | 4.82 | 3.23 | 2.38 | 122.4 | 82.0 | 60.5 |
| LL20H51 | 2½ | 50 | 2-11½ | – | 2 | 5.55 | 4.11 | 3.75 | 141.0 | 104.4 | 95.3 |
| LL20H51BS | 2½ | 50 | – | 2-11 | 2 | 5.55 | 4.11 | 3.75 | 141.0 | 104.4 | 95.3 |
| LL20H56 | 2½ | 50 | 2½-8 | – | 2 | 6.14 | 4.11 | 3.75 | 156.0 | 104.4 | 95.3 |
| LL20H56BS | 2½ | 50 | – | 2½-11 | 2 | 6.14 | 4.11 | 3.75 | 156.0 | 104.4 | 95.3 |
| LL20H61 | 2½ | 50 | 3-8 | – | 2 | 7.00 | 4.11 | 4.00 | 177.8 | 104.4 | 101.6 |
| LL20H61BS | 2½ | 50 | – | 3-11 | 2 | 7.00 | 4.11 | 4.00 | 177.8 | 104.4 | 101.6 |
A=Overall Length, B=Maximum Diameter
* ISO 7241-1 Series B does not include 1-¼ inch body size couplings;therefore, Series 10HK is not covered by this standard.
To obtain connected length of coupling, add dimensions A (Fig. 2) and E (Fig. 4) together.
Plugs/Male
| Part Number (303 Stainless) | Part Number (316 Stainless) | Body Size (in) | ISO Size (mm) | Thread Size (NPTF) | Thread Size (BSPP) | Thread Size (SAE) | Fig. | C (in) | D (in) | E (in) | Hex (in) | C (mm) | D (mm) | E (mm) | Hex (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LL1K11 | ML1K11 | ⅛ | 5 | ⅛-27 | – | – | 3 | 1.26 | 0.65 | 0.44 | 0.56 | 32.0 | 16.5 | 11.2 | 14.2 |
| LL1K4 | – | ⅛ | 5 | – | – | ⅞-20 | 3 | 1.41 | 0.79 | 0.59 | 0.69 | 35.8 | 20.1 | 15.0 | 17.5 |
| LL2K16 | ML2K16 | ¼ | 6.3 | ¼-18 | – | – | 3 | 1.52 | 0.87 | 0.56 | 0.75 | 38.6 | 22.1 | 14.2 | 19.1 |
| LL2K16BS | ML2K16BS | ¼ | 6.3 | – | ¼-19 | – | 3 | 1.52 | 0.87 | 0.56 | 0.75 | 38.6 | 22.1 | 14.2 | 19.1 |
| LL2K6 | – | ¼ | 6.3 | – | – | ⅞-18 | 3 | 1.66 | 1.01 | 0.70 | 0.88 | 42.2 | 25.7 | 17.8 | 22.4 |
| LL3K21 | ML3K21 | ⅜ | 10 | ⅜-18 | – | – | 3 | 1.76 | 1.01 | 0.61 | 0.88 | 44.7 | 25.7 | 15.5 | 22.4 |
| LL3K21BS | ML3K21BS | ⅜ | 10 | – | ⅜-19 | – | 3 | 1.76 | 1.01 | 0.61 | 0.88 | 44.7 | 25.7 | 15.5 | 22.4 |
| LL3K8 | – | ⅜ | 10 | – | – | ¾-16 | 3 | 1.94 | 1.15 | 0.79 | 1.00 | 49.3 | 29.2 | 20.1 | 25.4 |
| LL4KP26 | ML4KP26 | ½ | 12.5 | ½-14 | – | – | 3 | 2.03 | 1.30 | 0.76 | 1.13 | 51.6 | 33.0 | 19.3 | 28.7 |
| LL4KP26BS | ML4KP26BS | ½ | 12.5 | – | ½-14 | – | 3 | 2.03 | 1.30 | 0.76 | 1.13 | 51.6 | 33.0 | 19.3 | 28.7 |
| LL4KP10 | – | ½ | 12.5 | – | – | ¾-14 | 3 | 2.11 | 1.37 | 0.84 | 1.19 | 53.6 | 34.8 | 21.3 | 30.2 |
| LL6KP31 | ML6KP31 | ¾ | 20 | ¾-14 | – | – | 3 | 2.36 | 1.52 | 0.71 | 1.31 | 59.9 | 38.6 | 18.0 | 33.3 |
| LL6KP31BS | ML6KP31BS | ¾ | 20 | – | ¾-14 | – | 3 | 2.36 | 1.52 | 0.71 | 1.31 | 59.9 | 38.6 | 18.0 | 33.3 |
| LL8KP36 | ML8KP36 | 1 | 25 | 1-11½ | – | – | 3 | 2.54 | 1.59 | 0.89 | 1.63 | 72.4 | 40.4 | 22.6 | 41.4 |
| LL8KP36BS | ML8KP36BS | 1 | 25 | – | 1-11 | – | 3 | 2.85 | 1.88 | 0.97 | 1.63 | 72.4 | 47.8 | 24.6 | 41.4 |
| LL8KP16 | – | 1 | 25 | – | – | 1⅜-12 | 3 | 2.85 | 2.17 | 0.97 | 1.88 | 72.4 | 55.1 | 24.6 | 47.8 |
C=Overall Length, D=Maximum Diameter, E=Exposed Length when Connected
To obtain connected length of coupling, add dimensions A (Fig. 1) and E (Fig. 3) together.
Plugs/Male
| Part Number | Body Size (in) | ISO Size (mm) | Thread Size (NPTF) | Thread Size (BSPP) | Fig. | C (in) | D (in) | E (in) | Hex (in) | C (mm) | D (mm) | E (mm) | Hex (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LL10K41* | 1¼ | – | 1¼-11½ | – | 4 | 4.25 | 2.74 | 2.33 | 2.38 | 108.0 | 69.6 | 59.2 | 60.5 |
| LL10K41BS* | 1¼ | – | – | 1¼-11 | 4 | 4.25 | 2.74 | 2.33 | 2.38 | 108.0 | 69.6 | 59.2 | 60.5 |
| LL12K41 | 1½ | 40 | 1¼-11½ | – | 4 | 4.76 | 3.23 | 2.67 | 2.38 | 120.9 | 82.0 | 67.8 | 60.5 |
| LL12K41BS | 1½ | 40 | – | 1¼-11 | 4 | 4.76 | 3.23 | 2.67 | 2.38 | 120.9 | 82.0 | 67.8 | 60.5 |
| LL12K46 | 1½ | 40 | – | 1½-11½ | 4 | 4.76 | 3.23 | 2.67 | 2.38 | 120.9 | 82.0 | 67.8 | 60.5 |
| LL12K46BS | 1½ | 40 | – | 1½-11 | 4 | 4.76 | 3.23 | 2.67 | 2.38 | 120.9 | 82.0 | 67.8 | 60.5 |
| LL20K51 | 2½ | 50 | 2-11½ | – | 4 | 5.49 | 4.33 | 2.97 | 3.75 | 139.4 | 110.0 | 75.4 | 95.3 |
| LL20K51BS | 2½ | 50 | – | 2-11 | 4 | 5.49 | 4.33 | 2.97 | 3.75 | 139.4 | 110.0 | 75.4 | 95.3 |
| LL20K56 | 2½ | 50 | 2½-8 | – | 4 | 6.08 | 4.33 | 3.56 | 3.75 | 154.4 | 110.0 | 90.4 | 95.3 |
| LL20K56BS | 2½ | 50 | – | 2½-11 | 4 | 6.08 | 4.33 | 3.56 | 3.75 | 154.4 | 110.0 | 90.4 | 95.3 |
| LL20K61 | 2½ | 50 | 3-8 | – | 4 | 6.94 | 4.62 | 4.42 | 4.00 | 176.3 | 117.3 | 112.3 | 101.6 |
| LL20K61BS | 2½ | 50 | – | 3-11 | 4 | 6.94 | 4.62 | 4.42 | 4.00 | 176.3 | 117.3 | 112.3 | 101.6 |
C=Overall Length, D=Maximum Diameter, E=Exposed Length when Connected
* ISO 7241-1 Series B does not include 1-¼ inch body size couplings; therefore, Series 10HK is not covered by this standard.
To obtain connected length of coupling, add dimensions A (Fig. 2) and E (Fig. 4) together.
Dust Plugs and Dust Caps Accessories
| Coupling Series | Plug Dust Cap Part No. (Metal) | Plug Dust Cap Part No. (Vinyl) | Socket Dust Plug Part No. (Metal) | Socket Dust Plug Part No. (Vinyl) |
|---|---|---|---|---|
| 1HK | XPDC1HK* | XPPDC1HK | SDC1HK* | XPSDC1HK |
| 2HK | XPDC2HK* | XPPDC2HK | SDC2HK* | XPSDC2HK |
| 3HK | XPDC3HK* | XPPDC3HK | SDC3HK* | XPSDC3HK |
| 4HK | XPDC4HK** | XPPDC4HK(RD)*** | SDC4HK** | XPSDC4HK(RD)*** |
| 6HK | XPDC6HK** | XPPDC6HK(RD)*** | SDC6HK** | XPSDC6HK(RD)*** |
| 8HK | XPDC8HK** | XPPDC8HK(RD)*** | SDC8HK** | XPSDC8HK(RD)*** |
| 12HK | XPDC12HK** | – | SDC12HK** | – |
| 20HK | XPDC20HK** | – | SDC20HK** | – |