Metal Pipe Couplings | McMaster-Carr

Quick-Tighten Standard-Wall Iron and Steel Threaded Pipe Nipples and Pipe

Tighten both ends at the same time by turning with a wrench; also known as Schedule 40

Extra-Thick-Wall Iron and Steel Threaded Pipe Nipples and Pipe

Pair with high-pressure fittings; also known as Schedule 160

108 products

Ultra-Thick-Wall Iron and Steel Threaded Pipe Nipples and Pipe

Our strongest threaded pipe for handling extreme pressures; also known as Schedule XXH

84 products

FM-Approved Low-Pressure Iron and Steel Threaded Pipe Flanges

Add an access point to fire water mains and sprinkler systems

Extreme-Pressure Iron and Steel Threaded Pipe Flanges

Create an access point in extreme-pressure lines; also known as Class 1500 flanges

SAE High-Pressure Iron and Steel Threaded Two-Piece Pipe Flanges

Pair with an adapter to build a custom access point in hydraulic lines up to 3,000 psi

High-Pressure Iron and Steel Threaded Pipe Flanges

Create an access point in lines up to 1,400 psi; also known as Class 300 or Class 600 flanges

SAE Extreme-Pressure Iron and Steel Threaded Two-Piece Pipe Flanges

Pair with an adapter for a custom access point in hydraulic lines up to 6,000 psi

12 products

SAE High-Pressure Iron and Steel Threaded Pipe Flanges

Add an access point in hydraulic lines up to 3,000 psi; also known as Code 61 SAE hydraulic flanges

High-Pressure Iron and Steel Threaded Pipe Fitting Assortments

Keep various sizes of high-pressure caps and plugs on hand

Low-Pressure Stainless Steel Threaded Pipe Fittings

Stainless Steel Threaded Pipe and Fittings

For pressures up to 500 psi

1,387 products

Medium-Pressure Stainless Steel Threaded Pipe Fittings

For pressures up to 1,000 psi

175 products

High-Pressure Stainless Steel Threaded Pipe Fittings

Strong enough for pressures up to 3,000 psi

563 products

Standard-Wall Stainless Steel Threaded Pipe Nipples and Pipe

Pair with low-pressure fittings; also known as Schedule 40

1,308 products

Premium Medium-Pressure Stainless Steel Threaded Pipe Fittings

Cast in the U.S. and include certificate with traceable lot number

47 products

Extreme-Pressure Stainless Steel Threaded Pipe Fittings

Our strongest stainless steel threaded fittings withstand pressures as high as 15,000 psi

439 products

Premium Low-Pressure Stainless Steel Threaded Pipe Fittings

Cast in the U.S. and include certificate with traceable lot number

134 products

Precision Extreme-Pressure Stainless Steel Threaded Pipe Fittings

The tightest tolerances of our stainless steel fittings; also called instrumentation fittings

243 products

Thick-Wall Stainless Steel Threaded Pipe Nipples and Pipe

Pair with high-pressure fittings; also known as Schedule 80

479 products

Low-Pressure Stainless Steel Threaded Pipe Fittings with Sealant

Male threads have sealant applied for extra leak protection in low-pressure lines

141 products

Standard-Wall Stainless Steel Threaded Pipe Nipples and Pipe with Sealant

Male threads have sealant applied for extra leak protection in low-pressure lines

206 products

Miniature Medium-Pressure Stainless Steel Threaded Pipe Fittings

Less than two inches to fit in medium-pressure lines with limited space

204 products

Standard-Wall Stainless Steel Threaded Pipe Nipples and Pipe Assortments

Keep multiple lengths of low-pressure pipe nipples and pipe on hand

22 products

Low-Pressure Stainless Steel Threaded Pipe Flanges

Create an access point in lines up to 290 psi; also known as Class 150 flanges

98 products

SAE High-Pressure Stainless Steel Threaded Two-Piece Pipe Flanges

Pair with an adapter for a custom access point in hydraulic lines up to 5,000 psi

SAE High-Pressure Stainless Steel Threaded Pipe Flanges

Add an access point in high-pressure hydraulic lines; also known as Code 61 SAE hydraulic flanges

High-Pressure Stainless Steel Threaded Pipe Flanges

Create an access point in lines up to 1,200 psi; also known as Class 300 or Class 600 flanges

34 products

Drain, Waste, and Vent Pipe and Fittings

Drain, Waste, and Vent PVC Clamp-On Pipe Fittings for Water

Clamp onto pipe for a strong seal and easy assembly

111 products

Drain, Waste, and Vent Iron and Steel Pipe Fittings

Durable enough for pipe systems above and below ground; also called no-hub and soil pipe fittings

40 products

Cut-to-Length Drain, Waste, and Vent PVC Clamp-On Pipe Fittings for Water

Cut to the length you need to connect pipe up to 100 ft. apart

6 products

Drain, Waste, and Vent PVC Pipe Fittings for Joining Metal to Plastic

Connect PVC waste pipe to cast iron pipe without adding bulk

4 products

Drain, Waste, and Vent Iron and Steel Pipe Nipples and Pipe

Durable enough for pipe systems above and below ground; also called no-hub and soil pipe

5 products

Aluminum Threaded Pipe and Fittings

Low-Pressure Aluminum Threaded Pipe Fittings

For pressures up to 250 psi

372 products

High-Pressure Aluminum Threaded Pipe Fittings

Our strongest aluminum threaded fittings withstand pressures up to 3,000 psi

43 products

Standard-Wall Aluminum Threaded Pipe Nipples and Pipe

Pair with low-pressure fittings; also known as Schedule 40

374 products

Medium-Pressure Aluminum Threaded Pipe Fittings

For pressures up to 1,000 psi

28 products

Miniature Low-Pressure Aluminum Threaded Pipe Fittings

Less than two inches to fit in low-pressure lines with limited space

59 products

Thick-Wall Aluminum Threaded Pipe Nipples and Pipe

Pair with high-pressure fittings; also known as Schedule 80

24 products

Low-Pressure Aluminum Threaded Pipe Flanges

Create an access point in lines up to 150 psi; also known as Class 125 flanges

21 products

Brass and Bronze Threaded Pipe and Fittings

High-Pressure Brass and Bronze Threaded Pipe Fittings

Strong enough for pressures up to 3,900 psi

882 products

Low-Pressure Brass and Bronze Threaded Pipe Fittings

For pressures up to 300 psi

711 products

High-Pressure Brass and Bronze Threaded Pipe Fittings for Drinking Water

NSF/ANSI rated for drinking water systems up to 1,200 psi

124 products

Precision High-Pressure Brass and Bronze Threaded Pipe Fittings

The tightest tolerances of our brass pipe fittings; also known as instrumentation fittings

127 products

Medium-Pressure Brass and Bronze Threaded Pipe Fittings

For pressures up to 700 psi

119 products

Universal-Thread Medium-Pressure Brass and Bronze Threaded Pipe Fittings

Compatible with the most common thread types for when you're unsure which one you need

22 products

High-Pressure Brass and Bronze Threaded Pipe Nipples and Pipe

Strong enough for pressures up to 2,170 psi

140 products

Standard-Wall Brass and Bronze Threaded Pipe Nipples and Pipe

Pair with low-pressure fittings; also known as Schedule 40

438 products

High-Pressure Brass and Bronze Threaded Pipe Fittings with Sealant

Male threads have sealant applied for extra leak protection in high-pressure lines

79 products

Miniature Low-Pressure Brass and Bronze Threaded Pipe Fittings

Less than an inch to fit in low-pressure lines with limited space

Standard-Wall Brass and Bronze Threaded Pipe Nipples and Pipe for Drinking Water

NSF/ANSI rated for drinking water systems; also known as Schedule 40

68 products

Low-Pressure Brass and Bronze Threaded Pipe Fittings with Sealant

Male threads have sealant for extra leak protection in low-pressure lines

High-Pressure Brass and Bronze Threaded Pipe Nipples and Pipe for Drinking Water

NSF/ANSI rated for drinking water systems up to 1,000 psi

Standard-Wall Brass and Bronze Threaded Pipe Nipples and Pipe with Sealant

Threads have sealant applied for extra leak protection in low-pressure lines; known as Schedule 40

88 products

Miniature High-Pressure Brass and Bronze Threaded Pipe Fittings

No bigger than an inch to fit in high-pressure lines with limited space

25 products

Brass and Bronze Threaded Cleanout Plugs

Close off your drain cleanout pipe

Easy-Install High-Pressure Brass and Bronze Threaded Pipe Fittings

Install and remove with a socket wrench or hex key

15 products

High-Pressure Brass and Bronze Threaded Pipe Nipples and Pipe with Sealant

Male threads have sealant applied for extra leak protection in high-pressure lines

Thick-Wall Brass and Bronze Threaded Pipe Nipples and Pipe

Pair with high-pressure fittings; also known as Schedule 80

144 products

Standard-Wall Brass and Bronze Threaded Pipe Nipples and Pipe Assortments for Drinking Water

Keep various lengths of NSF/ANSI-rated pipe on hand

Brass and Bronze Threaded Laboratory Pipe Flanges

Add a connection for stop cocks, needle valves, and nozzles

5 products

Low-Pressure Brass and Bronze Threaded Pipe Flanges

Create an access point in lines up to 225 psi; also known as Class 150 flanges

Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

Galvanized Iron and Steel Threaded Pipe and Fittings

For pressures up to 300 psi

497 products

Quick-Tighten Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

Tighten both ends at the same time by turning with a wrench

6 products

High-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

Strong enough for pressures up to 3,000 psi

127 products

Medium-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

For pressures up to 2,000 psi

100 products

Precision Extreme-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

The tightest tolerances of our iron and steel fittings; also known as instrumentation fittings

98 products

Standard-Wall Galvanized Iron and Steel Threaded Pipe Nipples and Pipe

Pair with low-pressure fittings; also known as Schedule 40

394 products

Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings with Sealant

Male threads have sealant applied for extra leak protection in low-pressure lines

64 products

Low-Pressure Galvanized Iron and Steel Threaded Pipe Flanges

Create an access point in lines up to 285 psi; also known as Class 150 flanges

13 products

Thick-Wall Galvanized Iron and Steel Threaded Pipe Nipples and Pipe

Pair with medium-pressure fittings; also known as Schedule 80

108 products

Standard-Wall Galvanized Iron and Steel Threaded Pipe Nipples and Pipe for Joining Dissimilar Metals

A plastic sleeve prevents corrosion when connecting different types of metal

Standard-Wall Galvanized Iron and Steel Threaded Pipe Nipples and Pipe with Sealant

Threads have sealant applied for extra leak protection in low-pressure lines

Extra-Thick-Wall Galvanized Iron and Steel Threaded Pipe Nipples and Pipe

Pair with high-pressure fittings; also known as Schedule 160

31 products

Standard-Wall Galvanized Iron and Steel Threaded Pipe Nipples and Pipe Assortments

Keep multiple lengths of low-pressure pipe nipples and pipe on hand; also known as Schedule 40

High-Pressure Galvanized Iron and Steel Threaded Pipe Flanges

Create an access point in high-pressure lines; also known as Class 300 flanges

7 products

Iron and Steel Unthreaded Pipe and Fittings

High-Pressure Iron and Steel Socket-Connect Pipe Fittings

Easier to weld than butt-weld fittings and withstand pressures up to 3,000 psi

161 products

FM-Approved Medium-Pressure Iron and Steel Grooved-End Pipe Fittings

Clamp to pipe for quick access to fire water mains and sprinkler systems; known as Victaulic fittings

56 products

Low-Pressure Iron and Steel Compression Pipe Fittings

Tighten by hand for quick, leak-free connections in lines up to 200 psi

29 products

High-Pressure Iron and Steel Clamp-On Pipe Fittings for Drinking Water

NSF/ANSI rated for drinking water systems up to 500 psi

Low-Pressure Iron and Steel Butt-Weld Pipe Fittings

Beveled ends help create strong welds for maximum flow in low-pressure lines

126 products

Medium-Pressure Iron and Steel Butt-Weld Pipe Fittings

Beveled ends help create strong welds for maximum flow in medium-pressure lines

Thick-Wall Iron and Steel Unthreaded Pipe Nipples and Pipe

Pair with high-pressure fittings; also known as Schedule 80

82 products

Standard-Wall Iron and Steel Unthreaded Pipe Nipples and Pipe

Pair with low-pressure fittings; also known as Schedule 40

117 products

Extreme-Pressure Iron and Steel Socket-Connect Pipe Fittings

Our strongest iron and steel unthreaded fittings withstand pressures up to 6,000 psi

30 products

High-Pressure Iron and Steel Butt-Weld Pipe Fittings

Beveled ends help create strong welds for maximum flow in high-pressure lines

78 products

Low-Pressure Iron and Steel Press-Socket Pipe Fittings

Crimp onto pipe for a leak-free connection that's faster than threading or welding

136 products

Low-Pressure Iron and Steel Unthreaded Pipe Flanges

Create an access point in lines up to 230 psi

135 products

FM-Approved Standard-Wall Iron and Steel Grooved-End Pipe Nipples and Pipe

Clamp to fittings for quick access to fire water mains and sprinkler systems

23 products

High-Pressure Iron and Steel Unthreaded Pipe Flanges

Create an access point in lines up to 1,400 psi; also known as Class 300 or Class 600 flanges

97 products

Ultra-Thick-Wall Iron and Steel Unthreaded Pipe Nipples and Pipe

Our strongest unthreaded pipe for handling extreme pressures; also known as Schedule XXH

15 products

Extreme-Pressure Iron and Steel Unthreaded Pipe Flanges

Create an access point in extreme-pressure lines; also known as Class 1500 flanges

18 products

SAE High-Pressure Iron and Steel Unthreaded Pipe Flanges

Add an access point in hydraulic lines up to 3,000 psi; also known as Code 61 SAE hydraulic flanges

FM-Approved Low-Pressure Iron and Steel Flanged-End Pipe Fittings

Mate with flat-surface flanges, pumps, and valves to add an access point in fire-protection systems

FM-Approved Low-Pressure Iron and Steel Unthreaded Pipe Flanges

Add an access point to fire water mains and sprinkler systems

High-Pressure Stainless Steel Socket-Connect Pipe Fittings

Stainless Steel Unthreaded Pipe and Fittings

Easier to weld than butt-weld fittings and withstand pressures up to 3,000 psi

194 products

Low-Pressure Stainless Steel Socket-Connect Pipe Fittings

Easier to weld than butt-weld fittings and withstand pressures up to 300 psi

Low-Pressure Stainless Steel Clamp-On Pipe Fittings

Clamp onto pipe for a strong seal and easy assembly

15 products

Standard-Wall Stainless Steel Unthreaded Pipe Nipples and Pipe

Pair with low- and medium-pressure fittings; also known as Schedule 40

286 products

Easy-Access Low-Pressure Stainless Steel Clamp-On Pipe Fittings

Turn the T-handle to tighten and loosen without tools

Medium-Pressure Stainless Steel Butt-Weld Pipe Fittings

Beveled ends help create strong welds for maximum flow in medium-pressure lines

164 products

Thick-Wall Stainless Steel Unthreaded Pipe Nipples and Pipe

Pair with high-pressure fittings; also known as Schedule 80

Extreme-Pressure Stainless Steel Socket-Connect Pipe Fittings

Our strongest stainless steel unthreaded fittings withstand pressures up to 7,700 psi

29 products

High-Pressure Stainless Steel Butt-Weld Pipe Fittings

Beveled ends help create strong welds for maximum flow in lines up to 3,000 psi

69 products

Low-Pressure Stainless Steel Compression Pipe Fittings

Tighten by hand for quick, leak-free connections in lines up to 200 psi

23 products

Low-Pressure Stainless Steel Unthreaded Pipe Flanges

Create an access point in lines up to 230 psi

252 products

Low-Pressure Stainless Steel Butt-Weld Pipe Fittings

Beveled ends help create strong welds for maximum flow in low-pressure lines

258 products

Thin-Wall Stainless Steel Unthreaded Pipe Nipples and Pipe

Pair with low-pressure fittings; also known as Schedule 10

139 products

Extra-Thick-Wall Stainless Steel Unthreaded Pipe Nipples and Pipe

The strongest stainless steel pipe we offer for extreme pressures; also known as Schedule 160

30 products

Low-Pressure Stainless Steel Press-Socket Pipe Fittings

Crimp onto pipe for a leak-free connection that's faster than threading or welding

High-Pressure Stainless Steel Unthreaded Pipe Flanges

Create an access point in lines up to 1,200 psi; also known as Class 300 or Class 600 flanges

152 products

SAE High-Pressure Stainless Steel Unthreaded Pipe Flanges

Add an access point in hydraulic lines up to 5,000 psi; also known as Code 61 SAE hydraulic flanges

10 products

Galvanized Iron and Steel Unthreaded Pipe and Fittings

Low-Pressure Galvanized Iron and Steel Clamp-On Pipe Fittings

Tighten the bolts to join pipe in air, vacuum, and gravity-flow systems up to 15 psi

28 products

Low-Pressure Galvanized Iron and Steel Compression Pipe Fittings

Tighten by hand for quick, leak-free connections in lines up to 125 psi

7 products

Titanium Threaded Pipe and Fittings

High-Pressure Titanium Threaded Pipe Fittings

Strong, lightweight, and more corrosion resistant than stainless steel fittings

19 products

Plastic Pipe and Fittings

Low-Pressure Plastic Compression Pipe Fittings for Water

Tighten by hand for quick, leak-free connections in lines up to 125 psi

Easy-Access CPVC Pipe Fittings for Chemicals

Connect to pipe with a clamp for quick access to chemical-process lines; known as Victaulic fittings

Thick-Wall Plastic Pipe Fittings for Water

Withstand heavy duty applications, such as water processing; also known as Schedule 80

166 products

Easy-Access UV-Resistant Polypropylene Pipe Fittings for Chemicals

Clamp onto pipe for quick disassembly and withstand sunlight and harsh chemicals

Standard-Wall Plastic Pipe Fittings for Water

The industry standard for low-pressure water lines; also known as Schedule 40

65 products

Rubber Drain Pipe Plugs

Seal unthreaded pipe ends

CPVC Pipe Fittings for Chemicals

Withstand salt solutions, acids, and other harsh substances

64 products

Clear-View Standard-Wall Plastic Pipe Fittings for Water

See inside low-pressure plumbing and water supply lines; also known as Schedule 40

10 products

Thick-Wall Plastic Pipe Flanges for Water

Create an access point in high-pressure water supply lines; also known as Class 150 flanges

Low-Pressure Aluminum Socket-Connect Pipe Fittings

Aluminum Unthreaded Pipe and Fittings

Easier to weld than butt-weld fittings since perfect alignment isn't necessary

35 products

Standard-Wall Aluminum Unthreaded Pipe Nipples and Pipe

Pair with low- and medium-pressure fittings; also known as Schedule 40

108 products

Thick-Wall Aluminum Unthreaded Pipe Nipples and Pipe

The strongest aluminum unthreaded pipe we offer; also known as Schedule 80

59 products

Thin-Wall Aluminum Unthreaded Pipe Nipples and Pipe

Pair with low-pressure fittings; also known as Schedule 10

48 products

Low-Pressure Aluminum Quick-Connect Pipe Fittings

Twist onto pipe for quick, sealed connections without threading, soldering, or welding

97 products

Medium-Pressure Aluminum Butt-Weld Pipe Fittings

Beveled ends help create strong welds for maximum flow in medium-pressure lines

39 products

Low-Pressure Aluminum Butt-Weld Pipe Fittings

Beveled ends help create strong welds for maximum flow in low-pressure lines

21 products

Low-Pressure Aluminum Unthreaded Pipe Flanges

Create an access point in lines up to 150 psi; also known as Class 125 flanges

33 products

High-Pressure Aluminum Butt-Weld Pipe Fittings

Beveled ends help create strong welds for maximum flow in high-pressure lines

Standard-Wall Aluminum Quick-Connect Pipe Nipples and Pipe

Tighten by hand for quick connections without threading, soldering, or welding

13 products

Copper Threaded Pipe and Fittings

Low-Pressure Copper Threaded Pipe Fittings

For pressures up to 200 psi

Standard-Wall Copper Threaded Pipe Nipples and Pipe

Pair with low-pressure fittings; also known as Schedule 40

3 products

Copper Unthreaded Pipe and Fittings

Standard-Wall Copper Unthreaded Pipe Nipples and Pipe

Pair with low-pressure fittings

18 products

Low-Pressure Copper Butt-Weld Pipe Fittings

Beveled ends help create strong welds for maximum flow in low-pressure lines

18 products

Brass and Bronze Unthreaded Pipe and Fittings

Low-Pressure Brass and Bronze Braze-Socket Pipe Fittings

Braze to pipe for a strong connection in lines up to 200 psi; also known as Silbraze fittings

35 products

Low-Pressure Brass and Bronze Unthreaded Pipe Flanges

Create an access point in lines up to 225 psi; also known as Silbraze flanges

12 products

Standard-Wall Brass and Bronze Unthreaded Pipe Nipples and Pipe

Braze to low-pressure pipe and fittings for a strong, leak-free connection; known as Schedule 40

32 products

Other Products

Tube Fittings

Make threaded, push to connect, barbed, and other types of connections between lengths of tube

8,333 products

Pipe Expansion Joints

Reduce stress, vibration, and noise in piping systems by absorbing movement

164 products

Hose Fittings

Create threaded, barbed, quick-disconnect, and other types of connections between lengths of hose

3,815 products

Manual On-Off Valves

Start and stop flow through a line

1,693 products

Grease Fitting Adapters

Mate grease fittings when the sizes and thread types don't match

Connect a pipe flange to a pipe without needing to weld it in place

Pipe Stub Ends

118 products

Faucet Spout Thread Adapters

Connect the female end of your garden hose to a faucet spout

4 products

Pipe Traps

Create a seal that prevents the backflow of gas

40 products

Pipe Locknuts

Thread onto the male end of a pipe fitting so it won't loosen from vibration

Create a leak-tight seal between tubing and fittings without heat or solder

Tube Crimpers

25 products

Pipe Wrenches

Grasp and turn pipe, conduit, and fittings

115 products

Motor-Actuated On-Off Valves

An electric motor handles higher flow rates and pressures than solenoid valves

41 products

Solenoid On-Off Valves

A solenoid withstands rapid cycling for applications with frequent opening and closing

515 products

Liquid-Dispensing Metering Valves

Program to dispense a specific amount of liquid every time and shut off when set amount is reached

3 products

Air-Actuated On-Off Valves

Operate on compressed air to start and stop flow faster than motor-driven valves

163 products

Pipe Groovers

Form grooves in pipe ends for on-site installation and maintenance