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Danfoss / Eaton Cplng HK Series

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Description & Features

Designed for versatility across numerous industries, the Danfoss / Eaton Cplng HK Series Quick Disconnect Couplings Plug excels in fluid transfer applications. Whether deployed in agriculture, construction, or transportation, this coupling ensures reliable performance under demanding conditions. It features a robust carbon steel construction with a male-to-female connection, utilizing a 3/8" NPTF push-to-connect mechanism, facilitating swift and tool-free connections.

The coupling boasts a flow rate of 2.9 gallons per minute and exceeds ISO 16028 operating pressures, ensuring superior performance and safety. Compatible with a range of fluids, the coupling is certified to ISO 7241-1 Series B standards, making it a reliable choice for general industry, military, and aerospace applications. The Buna-N seal material enhances durability, while the ball lock internal connection type ensures secure and leak-free operation.

SKU: 3K21VAA

Supplier Part Number (MPN): 3K21VAA

Specifications

Brand
Danfoss
Connection Size 1
3/8 in
Connection Size 2
3/8 in
Connection Style
Manual
Connection Type
FNPT
Connection Type 1
Female NPTF
Connection Type 2
Female NPTF
Dimensions
0.88 in Dia x 1.66 in L
Finish
Zinc Trivalent
Fitting Type
Coupling
Fluid Compatibility
Hydraulic Fluids
Hex Size
7/8 in
Latch Type
Push/Pull
Material
Steel
Material Construction
Carbon Steel
Maximum Operating Pressure
4000 psi
nmfc
50
Operating Temperature
-40 to 250 deg F
Seal Material
NBR
Series
HK1-8 Series
Thread Size
3/8-18
Valve Type
2-Way

Product Questions & Answers (1)

Question by: Larry Y on Jan 9, 2026, 3:45 PM
What kind of stuff is this coupling good for? I see a lot of different applications listed.
Answer by: Customer Support on Jan 11, 2026, 6:15 AM
This coupling works well in agriculture, construction, fluid transfer, and transportation, but it’s also used in military, aerospace, and even food and beverage applications. It's pretty versatile.

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