Skip to content
LL3H21 Hansen® by Danfoss | Quick Disconnect Coupling | HK1-8 Series | 3/8" Female NPTF x 3/8" ISO 7241-1 B | Socket | NBR Seal | 303 Stainless Steel

LL3H21 Hansen® by Danfoss | Quick Disconnect Coupling | HK1-8 Series | 3/8" Female NPTF x 3/8" ISO 7241-1 B | Socket | NBR Seal | 303 Stainless Steel

$0.00 - $0.00
$0.00
$105.16
$105.16 - $105.16
$105.16

Hansen® by Danfoss
HK Series | ISO 7241-1 B Interchange

Fluid Transfer and Hydraulic Quick Disconnect Coupling

Danfoss Hansen HK stainless steel coupling is a general purpose industrial interchange coupling offered in 303/316 grades of stainless steel for excellent corrosion resistance in rugged applications.

The HK Series features a ball latch mechanism with automatic self-sealing poppet valves.
Can I get a discount on my purchase?

Our listed prices are our lowest possible price with current costing but when volumes/value are high enough sometimes we can pass on a discount from the manufacturer.

Some products have predefined quantity discounts that will apply automatically, those pages have a table near the price describing the discount teirs.

If you feel your purchase quantity of a particular product is very large and want us to investigate with the manufacturer please feel free to Contact Us.

What if my item is out of stock?

All customers get an email regarding the shipping time frame of their purchase, usually within the business day. If your item is in stock we will ship within 1 business day, otherwise, the email will contain a lead time. If you do not receive this email, we recommend checking your email's spam folder. If you have any questions at that point please do not hesitate to Contact Us or chat below!

Can I get free shipping?

Shipping will calculate as free instantly if your order value exceeds $5000.

Some exceptions apply.

Free Freight is only available for the Contiguous USA.

Specifications for Variant SKU: LL3H21 Danfoss
Brand: Hansen
Series: HK1-8 Series
Shape (Orientation): Straight
Ends Configuration: 3/8in Female NPTF, 3/8in ISO-B QD Interchange
Material(s): 303 Stainless Steel
Seal Material(s): Buna-N/Nitrile Rubber
Product Features:
  • Self-sealing poppet valves provide excellent high and low pressure sealing.
  • 303/316 Stainless steel construction for greater corrosion resistance and fluid compatibility
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
ISO Standard:
  • Meets dimensional requirements to ISO standard 7241-1 Series B.
Materials:
  • Standard body material: 303 or 316 Stainless Steel.
  • Standard seal material: Nitrile (NBR) (40°F to +250°F | -40°C to +121°C)
European Pressure Equipment Directive:
  • Couplings with nominal diameters up to and including 25mm are designed and manufactured under Article 4.3 of the European 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

Series Body Size ISO Size Nominal Flow
Diameter		 Max. Operating
Pressure		 Rated
Flow*		 Air
Inclusion		 Fluid
Loss
Non Hazardous
Liquids & Gases
(Group 2)		 Hazardous
Liquids & Gases
(Group 1)
in. mm mm bar psi bar psi lpm gpm cc.max. cc.max.
1HK 1/8" 5mm 4.4mm 344 bar 5,000 psi 344 bar 5,000 psi 3 lpm 0.8 gpm 0.6 cc.max. 0.5 cc.max.
2HK 1/4" 6.3mm 5.9mm 255 bar 3,700 psi 255 bar 3,700 psi 12 lpm 3 gpm 1.2 cc.max. 0.9 cc.max.
3HK 3/8" 10mm 7.8mm 255 bar 3,700 psi 255 bar 3,700 psi 23 lpm 6 gpm 2.9 cc.max. 2.1 cc.max.
4HK 1/2" 12.5mm 10mm 293 bar 4,250 psi 293 bar 4,250 psi 45 lpm 12 gpm 3.6 cc.max. 3.5 cc.max.
6HK 3/4" 20mm 17mm 242 bar 3,500 psi 242 bar 3,500 psi 100 lpm 26 gpm 11.5 cc.max. 9.3 cc.max.
8HK 1" 25mm 19.6mm 207 bar 3,000 psi 207 bar 3,000 psi 189 lpm 50 gpm 18.0 cc.max. 16.9 cc.max.
10HK 1-1/4"** - 26.7mm 118 bar 1,700 psi 37 bar 537 psi 288 lpm 76 gpm 48.0 cc.max. 48.0 cc.max.
12HK 1-1/2" 40mm 35.1mm 152bar 2,200 psi 29 bar 421 psi 375 lpm 99 gpm 91.3 cc.max. 91.3 cc.max.
20HK 2-1/2" 50mm 46mm 104bar 1,500 psi 21 bar 305 psi 757 lpm 200 gpm 209.9 cc.max. 209.9 cc.max.

For questions related to vacuum please contact Danfoss.
** No ISO Standard available for the 10HK
Socket/Female (Figure 1)
Plugs (Male) (Figure 2)
HK1-8 Series
Part Number
303 Stainless Steel		 Part Number
316 Stainless Steel		 Body
Size		 ISO
Size		 Type Female
Thread		 Figure Dimensions
NBR Seal NBR Seal A B Across
Flats		 C D E Hex
LL1H11 ML1H11 1/8" 5mm Socket/Female 1/8-27 Fem. NPTF 1 1.91"
(48.5mm)		 0.98"
(24.9mm)		 0.56"
(14.2mm)		 - - - -
LL1K11 ML1K11 1/8" 5mm Plug/Male 1/8-27 Fem. NPTF 2 - - - 1.26"
(32.0mm)		 0.65"
(16.5mm)		 0.44"
(11.2mm)		 0.56"
(14.2mm)
 
LL1H4 - 1/8" 5mm Socket/Female 7/16-20 Fem. SAE ORB 1 2.06"
(52.3mm)		 0.98"
(24.9mm)		 0.69"
(17.5mm)		 - - - -
LL1K4 - 1/8" 5mm Plug/Male 7/16-20 Fem. SAE ORB 2 - - - 1.41"
(35.8mm)		 0.79"
(20.1mm)		 0.59"
(15.0mm)		 0.69"
(17.5mm)
 
LL2H16 ML2H16 1/4" 6.3mm Socket/Female 1/4-18 Fem. NPTF 1 2.26"
(57.4mm)		 1.14"
(29.0mm)		 0.75"
(19.1mm)		 - - - -
LL2K16 ML2K16 1/4" 6.3mm Plug/Male 1/4-18 Fem. NPTF 2 - - - 1.52"
(38.6mm)		 0.87"
(22.1mm)		 0.56"
(14.2mm)		 0.75"
(19.1mm)
 
LL2H16BS ML2H16BS 1/4" 6.30mm Socket/Female 1/4-19 Fem. BSPP 1 2.31"
(58.7mm)		 1.14"
(29.0mm)		 0.75"
(19.1mm)		 - - - -
LL2K16BS ML2K16BS 1/4" 6.30mm Plug/Male 1/4-19 Fem. BSPP 2 - - - 1.52"
(38.6mm)		 0.87"
(22.1mm)		 0.56"
(14.2mm)		 0.75"
(19.1mm)
 
LL2H6 - 1/4" 6.3mm Socket/Female 9/16-18 Fem. SAE ORB 1 2.40"
(61.0mm)		 1.14"
(29.0mm)		 0.88"
(22.4mm)		 - - - -
LL2K6 - 1/4" 6.3mm Plug/Male 9/16-18 Fem. SAE ORB 2 - - - 1.66"
(42.2mm)		 1.01"
(25.7mm)		 0.70"
(17.8mm)		 0.88"
(22.4mm)
 
LL3H21 ML3H21 3/8" 10mm Socket/Female 3/8-18 Fem. NPTF 1 2.56"
(65.0mm)		 1.42"
(36.1mm)		 0.88"
(22.4mm)		 - - - -
LL3K21 ML3K21 3/8" 10mm Plug/Male 3/8-18 Fem. NPTF 2 - - - 1.76"
(44.7mm)		 1.01"
(25.7mm)		 0.61"
(15.5mm)		 0.88"
(22.4mm)
 
LL3H21BS ML3H21BS 3/8" 10mm Socket/Female 3/8-19 Fem. BSPP 1 2.56"
(65.0mm)		 1.42"
(36.1mm)		 0.88"
(22.4mm)		 - - - -
LL3K21BS ML3K21BS 3/8" 10mm Plug/Male 3/8-19 Fem. BSPP 2 - - - 1.76"
(44.7mm)		 1.01"
(25.7mm)		 0.61"
(15.5mm)		 0.88"
(22.4mm)
 
LL3H8 - 3/8" 10mm Socket/Female 3/4-16 Fem. SAE ORB 1 2.74"
(69.6mm)		 1.42"
(36.1mm)		 1.00"
(25.4mm)		 - - - -
LL3K8 - 3/8" 10mm Plug/Male 3/4-16 Fem. SAE ORB 2 - - - 1.94"
(49.3mm)		 1.15"
(29.2mm)		 0.79"
(20.1mm)		 1.00"
(25.4mm)
 
LL4HP26 ML4HP26 1/2" 12.5mm Socket/Female 1/2-14 Fem. NPTF 1 2.96"
(75.2mm)		 1.86"
(47.2mm)		 1.13"
(28.7mm)		 - - - -
LL4KP26 ML4KP26 1/2" 12.5mm Plug/Male 1/2-14 Fem. NPTF 2 - - - 2.03"
(51.6mm)		 1.30"
(33.0mm)		 0.76"
(19.3mm)		 1.13"
(28.7mm)
 
LL4HP26BS ML4HP26BS 1/2" 12.5mm Socket/Female 1/2-14 Fem. BSPP 1 2.96"
(75.2mm)		 1.86"
(47.2mm)		 1.13"
(28.7mm)		 - - - -
LL4KP26BS ML4KP26BS 1/2" 12.5mm Plug/Male 1/2-14 Fem. BSPP 2 - - - 2.03"
(51.6mm)		 1.30"
(33.0mm)		 0.76"
(19.3mm)		 1.13"
(28.7mm)
 
LL4HP10 - 1/2" 12.5mm Socket/Female 7/8-14 Fem. SAE ORB 1 3.05"
(77.5mm)		 1.86"
(47.2mm)		 1.25"
(31.8mm)		 - - - -
LL4KP10 - 1/2" 12.5mm Plug/Male 7/8-14 Fem. SAE ORB 2 - - - 2.11"
(53.6mm)		 1.37"
(34.8mm)		 0.84"
(21.3mm)		 1.19"
(30.2mm)
 
LL6HP31 ML6HP31 3/4" 20mm Socket/Female 3/1-14 Fem. NPTF 1 3.48"
(88.4mm)		 2.22"
(56.4mm)		 1.31"
(33.3mm)		 - - - -
LL6KP31 ML6KP31 3/4" 20mm Plug/Male 3/4-14 Fem. NPTF 2 - - - 2.36"
(59.9mm)		 1.52"
(38.6mm)		 0.71"
(18.0mm)		 1.31"
(33.3mm)
 
LL6HP31BS ML6HP31BS 3/4" 20mm Socket/Female 3/4-14 Fem. BSPP 1 3.48"
(88.4mm)		 2.22"
(56.4mm)		 1.31"
(33.3mm)		 - - - -
LL6KP31BS ML6KP31BS 3/4" 20mm Plug/Male 3/4-14 Fem. BSPP 2 - - - 2.36"
(59.9mm)		 1.52"
(38.6mm)		 0.71"
(18.0mm)		 1.31"
(33.3mm)
 
LL6HP12 - 3/4" 20mm Socket/Female 1-1/16-12 Fem. SAE ORB 1 3.67"
(93.2mm)		 2.22"
(56.4mm)		 1.38"
(35.1mm)		 - - - -
LL6KP12 - 3/4" 20mm Plug/Male 1-1/16-12 Fem. SAE ORB 2 - - - 2.54"
(64.5mm)		 1.59"
(40.4mm)		 0.89"
(22.6mm)		 1.38"
(35.1mm)
 
LL8HP36 ML8HP36 1" 25mm Socket/Female 1-11-1/2 Fem. NPTF 1 4.13"
(104.9mm)		 2.61"
(66.3mm)		 1.75"
(44.5mm)		 - - - -
LL8KP36 ML8KP36 1" 25mm Plug/Male 1-11-1/2 Fem. NPTF 2 - - - 2.85"
(72.4mm)		 1.88"
(47.8mm)		 0.97"
(24.6mm)		 1.63"
(41.4mm)
 
LL8HP36BS ML8HP36BS 1" 25mm Socket/Female 1-11 Fem. BSPP 1 4.13"
(104.9mm)		 2.61"
(66.3mm)		 1.75"
(44.5mm)		 - - - -
LL8KP36BS ML8KP36BS 1" 25mm Plug/Male 1-11 Fem. BSPP 2 - - - 2.85"
(72.4mm)		 1.88"
(47.8mm)		 0.97"
(24.6mm)		 1.63"
(41.4mm)
 
LL8HP16 - 1" 25mm Socket/Female 1-5/16-12 Fem. SAE ORB 1 4.13"
(104.9mm)		 2.61"
(66.3mm)		 1.88"
(47.8mm)		 - - - -
LL8KP16 - 1" 25mm Plug/Male 1-5/16-12 Fem. SAE ORB 2 - - - 2.85"
(72.4mm)		 2.17"
(55.1mm)		 0.97"
(24.6mm)		 1.88"
(47.8mm)
HK10/12/20 Series
Socket/Female (Figure 3)
Plugs (Male) (Figure 4)
Part Number
303 Stainless Steel		 Body Size ISO
Size		 Type Female
Thread		 Figure Dimensions
NBR Seal A B Hex C D E Hex
LL10H41* 1-1/4" - Socket/Female 1-1/4-11-1/2 Fem. NPTF 1 4.51"
(114.6mm)		 2.73"
(69.3mm)		 2.38"
(60.5mm)		 - - - -
LL10K41* 1-1/4" - Plug/Male 1-1/4-11-1/2 Fem. NPTF 2 - - - 4.25"
(108.0mm)		 2.74"
(69.6mm)		 2.33"
(59.2mm)		 2.38"
(60.5mm)
 
LL10H41BS* 1-1/4" - Socket/Female 1-1/4-11 Fem. BSPP 1 4.51"
(114.6mm)		 2.73"
(69.3mm)		 2.38"
(60.5mm)		 - - - -
 
LL12H41 1-1/2" 40mm Socket/Female 1-1/4-11-1/2 Fem. NPTF 1 4.82"
(122.4mm)		 3.23"
(82.0mm)		 2.38"
(60.5mm)		 - - - -
LL12K41 1-1/2" 40mm Plug/Male 1-1/4-11-1/2 Fem. NPTF 2 - - - 4.76"
(120.9mm)		 2.74"
(69.6mm)		 2.67"
(67.8mm)		 2.38"
(60.5mm)
 
LL12H41BS 1-1/2" 40mm Socket/Female 1-1/4-11 Fem. BSPP 1 4.82"
(122.4mm)		 3.23"
(82.0mm)		 2.38"
(60.5mm)		 - - - -
LL12K41BS 1-1/4" 40mm Plug/Male 1-1/4-11 Fem. BSPP 2 - - - 4.76"
(120.9mm)		 2.74"
(69.6mm)		 2.67"
(67.8mm)		 2.38"
(60.5mm)
 
LL12H46 1-1/2" 40mm Socket/Female 1-1/2-11-1/2 Fem. NPTF 1 4.82"
(122.4mm)		 3.23"
(82.0mm)		 2.38"
(60.5mm)		 - - - -
LL12K46 1-1/2" 40mm Plug/Male 1-1/2-11-1/2 Fem. NPTF 2 - - - 4.76"
(120.9mm)		 2.74"
(69.6mm)		 2.67"
(67.8mm)		 2.38"
(60.5mm)
 
LL12H46BS 1-1/2" 40mm Socket/Female 1-1/2-11 Fem. BSPP 1 4.82"
(122.4mm)		 3.23"
(82.0mm)		 2.38"
(60.5mm)		 - - - -
LL12K46BS 1-1/2" 40mm Plug/Male 1-1/2-11 Fem. BSPP 2 - - - 4.76"
(120.9mm)		 2.74"
(69.6mm)		 2.67"
(67.8mm)		 2.38"
(60.5mm)
 
LL20H51 2-1/2" 50mm Socket/Female 2-11-1/2 Fem. NPTF 1 5.55"
(141.0mm)		 4.11"
(104.4mm)		 3.75"
(95.3mm)		 - - - -
LL20K51 2-1/2" 50mm Plug/Male 2-11-1/2 Fem. NPTF 2 - - - 5.49"
(139.4mm)		 4.33"
(110.0mm)		 2.97"
(75.4mm)		 3.75"
(95.3mm)
 
LL20H61 2-1/2" 50mm Socket/Female 3-8 Fem. NPTF 1 7.00"
(177.8mm)		 4.11"
(104.4mm)		 4.00"
(101.6mm)		 - - - -
LL20K61 2-1/2" 50mm Plug/Male 3-8 Fem. NPTF 2 - - - 6.94"
(176.3mm)		 4.62"
(117.3mm)		 4.42"
(112.3mm)		 4.00"
(101.6mm)

* ISO 7241-1 Series B does not include 1-1/4 inch body size couplings; therefore, Series 10HK is not covered by this standard
A=Overall Length, B=Maximum Diameter
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. 2) together.
To obtain connected length of coupling, add dimensions A (Fig. 3) and E (Fig. 4) together.

Danfoss (Eaton - Aeroquip)

Danfoss (Eaton - Aeroquip)

Danfoss is a global technology leader in power management solutions that make electrical, hydraulic and mechanical power operate more efficiently, reliably, safely and sustainably. Danfoss hydraulic pumps, motors, transmissions, valves, cylinders, controls, hose and fittings offer a unique combination of proven technology and innovative design that translates directly into reliable performance and enhanced uptime.

Shop Parts by Danfoss (Eaton - Aeroquip)