Weld-On Nipples | McMaster-Carr

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1,601 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

Standard-Wall Stainless Steel
Threaded Pipe Nipples and Pipe

Typically used with low-pressure stainless steel threaded pipe fittings.

Low-Pressure Stainless Steel Threaded Pipe Fittings

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

Standard-Wall Stainless Steel
Unthreaded Pipe Nipples and Pipe

Typically used with standard-wall and low-pressure stainless steel unthreaded pipe fittings.

Thin-Wall Stainless Steel
Unthreaded Pipe Nipples and Pipe

Typically used with thin-wall stainless steel unthreaded pipe fittings.

Extra-Thick-Wall Stainless Steel Unthreaded Pipe

Typically used with extreme-pressure stainless steel unthreaded pipe fittings.

Thick-Wall Stainless Steel Unthreaded Pipe

Typically used with thick-wall and high-pressure stainless steel unthreaded pipe fittings.

Standard-Wall Steel Threaded
Pipe Nipples and Pipe

Also known as Schedule 40, this steel pipe is designed for low-pressure applications.

Thick-Wall Steel Threaded Pipe Nipples and Pipe

Typically used with medium-pressure iron and steel threaded pipe fittings. Also known as Schedule 80.

Super-Thick-Wall Steel
Threaded Pipe Nipples and Pipe

Typically used with extreme-pressure iron and steel threaded pipe fittings. Also known as Schedule XXH.

Standard-Wall Steel Unthreaded
Pipe Nipples and Pipe

Typically used with standard-wall and low-pressure iron and steel unthreaded pipe fittings. Also known as Schedule 40.

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.

Thick-Wall Steel Unthreaded Pipe Nipples and Pipe

Typically used with thick-wall and high-pressure iron and steel unthreaded pipe fittings. Also known as Schedule 80.

Super-Thick-Wall Steel Unthreaded Pipe

Typically used with extreme-pressure iron and steel unthreaded pipe fittings. Pipe is also known as Schedule XXH .

Standard-Wall Grooved-End
Steel Pipe Nipples and Pipe

This steel pipe has grooved ends that connect to fittings with a clamp (sold separately) for an easy way to install piping systems.

Standard-Wall Brass Threaded
Pipe Nipples and Pipe

Typically used with low-pressure brass and bronze threaded pipe fittings.

Standard-Wall Aluminum
Unthreaded Pipe Nipples and Pipe

Typically used with standard-wall aluminum unthreaded pipe fittings.

Thick-Wall Aluminum Unthreaded
Pipe Nipples and Pipe

Typically used with thick-wall aluminum unthreaded pipe fittings.

Thick-Wall Butt-Weld Aluminum
Unthreaded Pipe Fittings

Thick walls give these Schedule 80 fittings excellent strength.

Thin-Wall Aluminum Unthreaded
Pipe Nipples and Pipe

Typically used with thin-wall aluminum unthreaded pipe fittings.

Copper-Nickel Unthreaded Pipe

Also known as Pressure Class 200 pipe.

Plastic Pipe and Pipe Fittings for Chemicals

UV-Resistant Polypropylene Pipe for Chemicals

This polypropylene pipe resists the damaging effects of ultraviolet light, so it’s suitable for outdoor use. It has the chemical resistance to withstand acids, solvents, and other harsh substances.

High-Purity Polypropylene
Pipe for Corrosive Chemicals

The inside of this pipe won’t leach contaminants into your line or accumulate particles—it’s polished to an ultra-smooth 12 Ra finish, which also makes it easy to clean. Made of polypropylene, it resists organic solvents, acids, and alkalis better than CPVC pipe.

High-Purity PVDF Pipe for Corrosive Chemicals

Made of PVDF that’s finished to a 12 Ra smoothness, this pipe handles some of the harshest chemicals without leaching contaminants into your line.

Metal Cam-and-Groove Hose Couplings for Chemicals and Petroleum

Metal Cam-and-Groove Hose
Couplings for Chemicals and Petroleum

Couplings are metal, which has better durability than plastic cam-and-groove hose couplings. They consist of a plug and a socket that connect and disconnect quickly. Use them if you need frequent access to a line. To connect, insert the plug into the socket and push the levers down.

Metal Pipe and Pipe Fittings

Standard-Wall Stainless SteelThreaded Pipe Nipples and Pipe

Low-Pressure Stainless Steel Threaded Pipe Fittings

Standard-Wall Stainless SteelUnthreaded Pipe Nipples and Pipe

Thin-Wall Stainless SteelUnthreaded Pipe Nipples and Pipe

Extra-Thick-Wall Stainless Steel Unthreaded Pipe

Thick-Wall Stainless Steel Unthreaded Pipe

Standard-Wall Steel ThreadedPipe Nipples and Pipe

Thick-Wall Steel Threaded Pipe Nipples and Pipe

Super-Thick-Wall SteelThreaded Pipe Nipples and Pipe

Standard-Wall Steel UnthreadedPipe Nipples and Pipe

High-Pressure Socket-ConnectSteel Unthreaded Pipe Fittings

Thick-Wall Steel Unthreaded Pipe Nipples and Pipe

Super-Thick-Wall Steel Unthreaded Pipe

Standard-Wall Grooved-EndSteel Pipe Nipples and Pipe

Standard-Wall Brass ThreadedPipe Nipples and Pipe

Standard-Wall AluminumUnthreaded Pipe Nipples and Pipe

Thick-Wall Aluminum UnthreadedPipe Nipples and Pipe

Thick-Wall Butt-Weld AluminumUnthreaded Pipe Fittings

Thin-Wall Aluminum UnthreadedPipe Nipples and Pipe

Copper-Nickel Unthreaded Pipe

Plastic Pipe and Pipe Fittings for Chemicals

UV-Resistant Polypropylene Pipe for Chemicals

High-Purity PolypropylenePipe for Corrosive Chemicals

High-Purity PVDF Pipe for Corrosive Chemicals

Metal Cam-and-Groove Hose Couplings for Chemicals and Petroleum

Metal Cam-and-Groove HoseCouplings for Chemicals and Petroleum

Standard-Wall Stainless Steel
Threaded Pipe Nipples and Pipe

Standard-Wall Stainless Steel
Unthreaded Pipe Nipples and Pipe

Thin-Wall Stainless Steel
Unthreaded Pipe Nipples and Pipe

Standard-Wall Steel Threaded
Pipe Nipples and Pipe

Super-Thick-Wall Steel
Threaded Pipe Nipples and Pipe

Standard-Wall Steel Unthreaded
Pipe Nipples and Pipe

High-Pressure Socket-Connect
Steel Unthreaded Pipe Fittings

Standard-Wall Grooved-End
Steel Pipe Nipples and Pipe

Standard-Wall Brass Threaded
Pipe Nipples and Pipe

Standard-Wall Aluminum
Unthreaded Pipe Nipples and Pipe

Thick-Wall Aluminum Unthreaded
Pipe Nipples and Pipe

Thick-Wall Butt-Weld Aluminum
Unthreaded Pipe Fittings

Thin-Wall Aluminum Unthreaded
Pipe Nipples and Pipe

High-Purity Polypropylene
Pipe for Corrosive Chemicals

Metal Cam-and-Groove Hose
Couplings for Chemicals and Petroleum