DANFOSS / EATON SS 1/2 ST SERIES SOCKET X 1/2 MNPT

Description & Features

Designed for demanding fluid transfer applications, the Danfoss / Eaton SS 1/2 ST Series Socket x 1/2 MNPT is a stainless steel quick disconnect coupling socket with a ball lock internal connection. The female half connects via push-to-connect and mates to a 1/2" male NPT port, supporting flow rates up to 22 gallons per minute and operating in temperatures as low as -40°F.

Buna-N seals and a straight-through valve design make this coupling well-suited for use across a broad range of industries, including chemical processing, food and beverage, injection molding, medical, marine, pressure washing, and steam cleaning. No special tools are required for connection or disconnection, and the design exceeds ISO 16028 operating pressure standards.

Part of the Hansen ST Series from Eaton's Aeroquip brand, this coupling is manufactured at the Van Wert, Ohio facility and carries a 1/2" port size.

SKU: LL4S25

Supplier Part Number (MPN): LL4S25

Specifications

Brand
Danfoss
Connection Size 1
1/2 in
Connection Size 2
1/2 in
Connection Type
Male ORB BSP
Connection Type 1
Male ORB BSPP
Connection Type 2
Male ORB BSPP
Dimensions
1.34 in Dia x 2.03 in L
Fitting Type
Coupling
Fluid Compatibility
Versatile Fluids
Hex Size
1.13 in
Latch Type
Push/Pull
Material
Stainless Steel
Material Construction
Stainless Steel
Maximum Operating Pressure
3600 psi
Operating Temperature
-40 to 250 deg F
Seal Material
NBR
Series
ST Series
Thread Size
1/2-14
Valve Type
Straight

Product Questions & Answers (1)

Question by: Hubert K on Sep 10, 2025, 7:52 AM
Reckon this'll work okay for pressure washing equipment?
Answer by: Customer Support on Sep 11, 2025, 1:01 PM
It's well-suited for pressure washing, yes. The stainless steel construction and Buna-N seals hold up across a range of temperatures, and it exceeds ISO 16028 operating pressure standards.

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