Hex Unions | McMaster-Carr

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Zinc Phosphate Coated

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Fed. Spec. QQ-A-200/8

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270 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.

Stainless Steel Pipe and Pipe Fittings

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.

Iron and Steel Pipe and Pipe Fittings

Low-Pressure Iron and Steel Threaded Pipe Fittings

Use these fittings for low-pressure applications in noncorrosive environments.

Low-Pressure Galvanized Iron
and Steel Threaded Pipe Fittings

The galvanized finish on these fittings provides fair corrosion resistance. Fittings are for use in low-pressure applications.

High-Pressure Iron and Steel Threaded Pipe Fittings

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

High-Pressure Galvanized
Steel Threaded Pipe Fittings

A galvanized finish gives these fittings better corrosion resistance than our plain steel high-pressure fittings. Also known as Pressure Class 3000 fittings.

Medium-Pressure Iron and
Steel Threaded Pipe Fittings

For use in noncorrosive environments, these fittings have better strength than our low-pressure iron and steel pipe fittings.

Medium-Pressure Galvanized Iron
and Steel Threaded Pipe Fittings

A galvanized finish gives these fittings fair corrosion resistance. They have the strength to handle medium-pressure applications.

Medium-Pressure Pipe Fittings
for Joining Dissimilar Metals

Use these unions to connect different metals in a piping or plumbing system. They have a gasket with a plastic sleeve that inhibits destructive corrosion.

Extreme-Pressure Steel Threaded Pipe Fittings

The strongest steel fittings we offer, these can withstand extreme-pressure applications.

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.

Extreme-Pressure Socket-Connect
Steel Unthreaded Pipe Fittings

Also known as Pressure Class 6000 fittings, these heavy duty forged fittings are the strongest steel fittings we offer.

Brass and Bronze Pipe and Pipe Fittings

High-Pressure Brass Threaded Pipe Fittings

These brass fittings have the strength to handle high-pressure applications.

High-Pressure Brass Threaded
Pipe Fittings for Drinking Water

Use these heavy-duty brass fittings for high-pressure drinking water applications.

Low-Pressure Brass and
Bronze Threaded Pipe Fittings

Use these fittings in low-pressure flow applications. They have good corrosion resistance.

Low-Pressure Plated Brass Threaded Pipe Fittings

Used in low-pressure pipe lines, these brass fittings have a plating that makes them shiny and improves corrosion resistance.

Medium-Pressure Brass and
Bronze Threaded Pipe Fittings

Choose these fittings when you need better strength than our low-pressure brass and bronze pipe fittings.

Bronze Unthreaded Pipe Fittings

Also known as Silbraze fittings.

Aluminum Threaded Pipe and Pipe Fittings

Low-Pressure Aluminum Threaded Pipe Fittings

In addition to being lightweight, these aluminum fittings offer good corrosion resistance. Use them in low-pressure flow applications.

High-Pressure Aluminum Threaded Pipe Fittings

Also known as Pressure Class 3000 fittings, these have the highest pressure rating of all the aluminum pipe fittings we offer.

Stainless Steel Pipe and 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

Iron and Steel Pipe and Pipe Fittings

Low-Pressure Iron and Steel Threaded Pipe Fittings

Low-Pressure Galvanized Ironand Steel Threaded Pipe Fittings

High-Pressure Iron and Steel Threaded Pipe Fittings

High-Pressure GalvanizedSteel Threaded Pipe Fittings

Medium-Pressure Iron andSteel Threaded Pipe Fittings

Medium-Pressure Galvanized Ironand Steel Threaded Pipe Fittings

Medium-Pressure Pipe Fittingsfor Joining Dissimilar Metals

Extreme-Pressure Steel Threaded Pipe Fittings

Low-Pressure Press-ConnectSteel Unthreaded Pipe Fittings

High-Pressure Socket-ConnectSteel Unthreaded Pipe Fittings

Extreme-Pressure Socket-ConnectSteel Unthreaded Pipe Fittings

Brass and Bronze Pipe and Pipe Fittings

High-Pressure Brass Threaded Pipe Fittings

High-Pressure Brass ThreadedPipe Fittings for Drinking Water

Low-Pressure Brass andBronze Threaded Pipe Fittings

Low-Pressure Plated Brass Threaded Pipe Fittings

Medium-Pressure Brass andBronze Threaded Pipe Fittings

Bronze Unthreaded Pipe Fittings

Aluminum Threaded Pipe and Pipe Fittings

Low-Pressure Aluminum Threaded Pipe Fittings

High-Pressure Aluminum Threaded Pipe Fittings

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 Galvanized Iron
and Steel Threaded Pipe Fittings

High-Pressure Galvanized
Steel Threaded Pipe Fittings

Medium-Pressure Iron and
Steel Threaded Pipe Fittings

Medium-Pressure Galvanized Iron
and Steel Threaded Pipe Fittings

Medium-Pressure Pipe Fittings
for Joining Dissimilar Metals

Low-Pressure Press-Connect
Steel Unthreaded Pipe Fittings

High-Pressure Socket-Connect
Steel Unthreaded Pipe Fittings

Extreme-Pressure Socket-Connect
Steel Unthreaded Pipe Fittings

High-Pressure Brass Threaded
Pipe Fittings for Drinking Water

Low-Pressure Brass and
Bronze Threaded Pipe Fittings

Medium-Pressure Brass and
Bronze Threaded Pipe Fittings