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Danfoss / Eaton Hansen and Gromelle 3S21 Socket Brass 3/8-18 IN NPTF Female 3/8 IN Body Size

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Description & Features

The Danfoss / Eaton Hansen and Gromelle 3S21 Socket is a robust component designed for efficient fluid transfer across various industrial applications, including chemical processing, marine environments, and pressure washing. Crafted from durable brass, this socket boasts a 3/8-18 IN NPTF female thread, ensuring a secure and reliable connection. Its quick connect and disconnect functionality simplifies use, requiring no special tools, and exceeds ISO 16028 operating pressures for enhanced performance.

With a straight-through valve type and a flow rate of 15 gallons per minute, this socket is ideal for demanding applications that require consistent performance. The socket features a ball lock internal connection type and is equipped with Buna-N seals, offering excellent compatibility with different fluids. Its compact form factor, with a body size of 3/8 inches and a width of 1.16 inches, makes it a versatile choice for space-constrained environments.

SKU: 3S21

Supplier Part Number (MPN): 3S21

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
1.16 in Dia x 1.75 in L
Fitting Type
Coupling
Fluid Compatibility
Versatile Fluids
Hex Size
1 x 1 in
Latch Type
Push-to-Connect
Material
Brass
Material Construction
Brass
Operating Temperature
-40 to 250 deg F
Seal Material
NBR
Series
ST Series
Thread Size
3/8-18
Valve Type
Straight

Product Questions & Answers (2)

Question by: Kirk P on Jun 9, 2025, 10:00 AM
does this socket work with a standard 3/8 NPTF port or do I need some kind of adapter to hook it up?
Answer by: Customer Support on Jun 11, 2025, 7:32 AM
Straight connection, no adapter needed. The 3S21 has a 3/8-18 NPTF female thread on the port end, so it threads directly onto any standard 3/8-18 NPTF male fitting. The body is brass and the internal lock is ball-style, so once it's threaded in and torqued down you're good to go.
Question by: Lynn M on Aug 2, 2025, 8:37 AM
i’m trying to swap out an old Hansen socket, is this 3S21 the female half with 3/8-18 NPTF threads?
Answer by: Customer Support on Aug 3, 2025, 11:06 AM
The 3S21 is the female half (socket) and it has a 3/8-18 NPTF female pipe thread connection, with a 3/8 inch body size.

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