Butt-Weld Tube Caps | McMaster-Carr

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304-304L Stainless Steel

316-316L Stainless Steel

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For Tube Fabrication

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2A992

2B999

EAR99

DFARS Specialty Metals

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Compliant with Exemptions

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251 Products

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

Butt-Weld Fittings for Stainless Steel Tubing

Butt-weld fittings allow for a smooth, flush connection that provides maximum flow.

Metal Pipe and Pipe Fittings

Thin-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

Also known as Schedule 10 fittings, these are thin, lightweight, and corrosion resistant.

Thick-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

Butt-weld fittings allow for a smooth, flush connection that provides maximum flow.

High-Pressure Stainless Steel
Unthreaded Pipe Flanges

Use these heavy duty forged flanges for high-pressure applications.

Standard-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

Butt-weld fittings allow for a smooth, flush connection that provides maximum flow.

Low-Pressure Stainless Steel
Unthreaded Pipe Flanges

Bolt two same-size flanges together with a gasket to create an access point within a pipe line.

Standard-Wall Butt-Weld Steel
Unthreaded Pipe Fittings

Butt-weld fittings allow for a smooth, flush connection that provides maximum flow.

Low-Pressure Steel Unthreaded Pipe Flanges

Bolt two flanges of the same size together with a gasket to create an access point in a pipe line.

Low-Pressure Steel Unthreaded
Pipe Flanges for Low Temperatures

Even in temperatures as low as -46°, these A350 LF2 steel flanges won’t become brittle, so they absorb impact better than other low-pressure steel flanges.

Thick-Wall Butt-Weld Steel Unthreaded Pipe Fittings

With thicker, stronger walls than our standard-wall butt-weld pipe fittings, these fittings stand up to your high strength applications.

High-Pressure Steel Unthreaded Pipe Flanges

Forged for extra strength, these heavy duty unthreaded flanges can withstand high-pressure applications.

Extreme-Pressure Steel Unthreaded Pipe Flanges

For excellent strength in extreme-pressure applications, choose these heavy duty Pressure Class 1500 flanges.

Standard-Wall Butt-Weld Aluminum
Unthreaded Pipe Fittings

Also known as Schedule 40 fittings, these have thicker walls than our thin-wall aluminum unthreaded pipe fittings.

Aluminum Unthreaded Pipe Flanges

Use these unthreaded flanges in low-pressure applications. Also known as Pressure Class 125 flanges.

How to Identify and Measure Fittings

Butt-Weld Fittings for Stainless Steel Tubing

Butt-Weld Fittings for Stainless Steel Tubing

Metal Pipe and Pipe Fittings

Thin-Wall Butt-Weld StainlessSteel Unthreaded Pipe Fittings

Thick-Wall Butt-Weld StainlessSteel Unthreaded Pipe Fittings

High-Pressure Stainless SteelUnthreaded Pipe Flanges

Standard-Wall Butt-Weld StainlessSteel Unthreaded Pipe Fittings

Low-Pressure Stainless SteelUnthreaded Pipe Flanges

Standard-Wall Butt-Weld SteelUnthreaded Pipe Fittings

Low-Pressure Steel Unthreaded Pipe Flanges

Low-Pressure Steel UnthreadedPipe Flanges for Low Temperatures

Thick-Wall Butt-Weld Steel Unthreaded Pipe Fittings

High-Pressure Steel Unthreaded Pipe Flanges

Extreme-Pressure Steel Unthreaded Pipe Flanges

Standard-Wall Butt-Weld AluminumUnthreaded Pipe Fittings

Aluminum Unthreaded Pipe Flanges

Thin-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

Thick-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

High-Pressure Stainless Steel
Unthreaded Pipe Flanges

Standard-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

Low-Pressure Stainless Steel
Unthreaded Pipe Flanges

Standard-Wall Butt-Weld Steel
Unthreaded Pipe Fittings

Low-Pressure Steel Unthreaded
Pipe Flanges for Low Temperatures

Standard-Wall Butt-Weld Aluminum
Unthreaded Pipe Fittings