Stainless Steel Unions | McMaster-Carr

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201 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

Metal Pipe and Pipe Fittings

Low-Pressure Stainless Steel Threaded Pipe Fittings

Use these corrosion-resistant fittings in a low-pressure pipe line.

High-Pressure Stainless
Steel Threaded Pipe Fittings

Use these heavy duty, corrosion-resistant fittings in high-pressure flow applications.

Precision Extreme-Pressure Stainless
Steel Threaded Pipe Fittings

These fittings are made to tighter tolerances than other stainless steel pipe fittings. They are also known as instrumentation fittings.

Medium-Pressure Stainless
Steel Threaded Pipe Fittings

Choose these fittings when you want the same high-quality found in our low-pressure pipe fittings, but need more strength to handle higher pressures.

Low-Pressure Socket-Connect Stainless
Steel Unthreaded Pipe Fittings

Socket-connect fittings are easier to weld than butt-weld fittings because the fitting doesn't need to align perfectly to the pipe. Slip the pipe into the socket and weld.

Low-Pressure Press-Connect Stainless
Steel Unthreaded Pipe Fittings

Press these fittings onto stainless steel pipe using a crimping tool for a permanent, leak-tight connection that's faster than threading or welding and doesn't require heat.

High-Pressure Socket-Connect
Stainless Steel Unthreaded Pipe Fittings

Socket-connect fittings are easier to weld than butt-weld fittings because the fitting doesn't need to align perfectly to the pipe. Slip the pipe into the socket and weld.

High-Pressure Iron and Steel Threaded Pipe Fittings

These fittings can stand up to high-pressure applications. Use them in noncorrosive environments.

Low-Pressure Press-Connect
Steel Unthreaded Pipe Fittings

Crimp these fittings onto steel pipe to form a tightly sealed connection that’s faster than threading or welding and doesn’t require heat.

High-Pressure Socket-Connect
Steel Unthreaded Pipe Fittings

Socket-connect fittings are easier to weld than butt-weld fittings because the fitting doesn't need to align perfectly to the pipe. Slide the pipe into the socket and weld.

Plastic Pipe and Pipe Fittings for Water

Thick-Wall Plastic Pipe Fittings for Water

Connect these fittings to Schedule 80 pipe. With thicker, stronger walls than standard-wall fittings, they can handle heavy duty supply applications, such as water processing, wastewater treatment, and irrigation.

Standard-Wall Plastic Pipe Fittings for Water

Connect these fittings to Schedule 40 plastic pipe—they are the industry standard for residential and commercial low-pressure plumbing and water supply applications. They are plastic for good corrosion resistance.

Metal Pipe and Pipe Fittings

Low-Pressure Stainless Steel Threaded Pipe Fittings

High-Pressure StainlessSteel Threaded Pipe Fittings

Precision Extreme-Pressure StainlessSteel Threaded Pipe Fittings

Medium-Pressure StainlessSteel Threaded Pipe Fittings

Low-Pressure Socket-Connect StainlessSteel Unthreaded Pipe Fittings

Low-Pressure Press-Connect StainlessSteel Unthreaded Pipe Fittings

High-Pressure Socket-ConnectStainless Steel Unthreaded Pipe Fittings

High-Pressure Iron and Steel Threaded Pipe Fittings

Low-Pressure Press-ConnectSteel Unthreaded Pipe Fittings

High-Pressure Socket-ConnectSteel Unthreaded Pipe Fittings

Plastic Pipe and Pipe Fittings for Water

Thick-Wall Plastic Pipe Fittings for Water

Standard-Wall Plastic Pipe Fittings for Water

High-Pressure Stainless
Steel Threaded Pipe Fittings

Precision Extreme-Pressure Stainless
Steel Threaded Pipe Fittings

Medium-Pressure Stainless
Steel Threaded Pipe Fittings

Low-Pressure Socket-Connect Stainless
Steel Unthreaded Pipe Fittings

Low-Pressure Press-Connect Stainless
Steel Unthreaded Pipe Fittings

High-Pressure Socket-Connect
Stainless Steel Unthreaded Pipe Fittings

Low-Pressure Press-Connect
Steel Unthreaded Pipe Fittings

High-Pressure Socket-Connect
Steel Unthreaded Pipe Fittings