Reducer coupling | A4 | WS 9635

A reducing socket in acid-proof stainless steel A4 (AISI 316), also known as a reducer coupling or reducing bush, is designed for connecting two pipe fittings with different thread dimensions. The socket has female pipe threads (BSP) at both ends—a larger and a smaller dimension—and is used where a transition between two pipe sizes is required with a tight and corrosion-resistant threaded connection. It is suitable for professional installations where long service life and consistent performance are critical.

APPLICATION AREA

The product is used in plumbing installations, marine environments and boat installations, the process industry, food and chemical industries, water treatment, and compressed air systems. It is intended for applications where a pipe or nipple with a larger dimension is to be connected to a smaller dimension, and where the material choice provides the necessary protection against corrosion and mechanical stress. The reducing socket is available in the dimensions 1/2" x 1/4", 3/4" x 1/2", 1" x 1/2", and 1" x 3/4".

TECHNICAL SPECIFICATIONS

• Product type: Pipe fitting
• Product family: Reducing socket (reducer coupling, reducing bush)
• Material grade: A4 (AISI 316, acid-proof stainless steel)
• Standard: WS 9635
• Thread dimension: 1/2" x 1/4" – 1" x 3/4" (female pipe thread, BSP)
• Design: Reducing socket with female threads at both ends
• Surface finish: Bright, untreated
• Environment: Marine / Outdoor / Indoor
• Delivery unit: Piece

FREQUENTLY ASKED QUESTIONS (FAQ)

What is a reducing socket?

A reducing socket is a pipe fitting with female threads at both ends, where one end has a larger dimension than the other. It is used to transition from one pipe dimension to a smaller one, for example, from 3/4" to 1/2". The socket is often combined with a hexagonal nipple to connect two internally threaded parts.

How do I read the dimension, for example 1" x 3/4"?

The first number indicates the larger thread dimension and the second the smaller one. A 1" x 3/4" reducing socket therefore has a 1" female thread at one end and a 3/4" female thread at the other. The inch dimension refers to the nominal size of the pipe thread, not the actual diameter in millimeters.

What is the difference between a reducing socket and a reducing nipple?

A reducing socket has female threads at both ends, while a reducing nipple (reducing hex nipple) has male threads at both ends. Choose a reducing socket when the parts to be connected have male threads.

Does an A4 reducing socket withstand saltwater?

A4 (AISI 316) contains molybdenum, which provides better resistance to chlorides and pitting corrosion than A2 (AISI 304). A4 is therefore called acid-proof and is the recommended choice in saltwater, marine environments, pool areas, and in contact with chemicals.