Butt Weld Tubing | McMaster-Carr

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	Material Material

	Pipe Size Pipe Size

1/8
1/4
3/8
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
4
6
8
10
12

	Threading Threading

Unthreaded

Threaded on One End

	Schedule Schedule


10	40

80	160

XXH

	System of Measurement System of Measurement

Inch

Metric

	Length Length

	ID ID

	OD OD

	Wall Thickness Wall Thickness

	Shape Shape


Straight	90° Elbow

Tee	Cap/Plug

Wye	45° Elbow

Cross

	Type Type


Adapter	Pipe

Connector	Reducer

Cap	Flange

	Connection Style Connection Style	Show

	Butt Weld

	Connection Style Connection Style	Hide

	For Tube OD For Tube OD

	For Use With For Use With

	Construction Construction

Seamless

Welded

	Specifications Met Specifications Met

3-A Sanitary Certified

	Connection Type Connection Type


Tube	Pipe

Hose

	Socket Connect Type Socket Connect Type

Weld

Socket Connect

Braze

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	Gender Gender

Male

Female

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	For Tube Material For Tube Material

316/316L Stainless Steel

304/304L Stainless Steel

316 Stainless Steel

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2,245 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.

Yor-Lok Fittings for Stainless Steel Tubing

Use these fittings at pressures up to 9,700 psi. Also known as instrumentation fittings, they are made to tight tolerances for use in high-precision applications. They are compatible with Swagelok®, Let-Lok, and Parker A-Lok fittings.

High-Polish Metal Quick-Clamp Sanitary Tube Fittings

The smooth finish inside these stainless steel quick-clamp fittings makes it easy to remove product residue.

Extra-Support High-Polish Metal
Quick-Clamp Sanitary Tube Fittings

Also known as I-line fittings, these quick-clamp fittings permit easy access to your line.

Extra-High-Polish Metal
Quick-Clamp Sanitary Tube Fittings

Polished to a 20 Ra finish, these fittings have an extra-smooth interior that prevents product buildup and inhibits bacteria growth.

Quick-Clamp High-Vacuum
Fittings for Stainless Steel Tubing

Also known as KF, QF, and NW fittings, these fittings are for high-vacuum applications, such as vacuum coating and heat treating, leak testing, and analyzing gases.

Butt-Weld Fittings for Stainless Steel Tubing

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

Ultra-High-Polish Gasket Fittings
for Stainless Steel Tubing

Polished to a 15 Ra and under finish, these fittings have a mirror smooth interior. They are also known as ultra-high-purity fittings.

Ultra-High-Polish Gasket Adapters
for Stainless Steel Tubing

Vibration-Resistant Ultra-High-Polish
Gasket Fittings for Stainless Steel Tubing

Fittings have two anti-torque rings that compress the gasket to prevent rotation and reduce particle generation in high-vibration applications.

High-Polish Gasket Fittings for Stainless Steel Tubing

Fittings are polished to a32 Ra and under finish on the interior.

Bolt-Together High-Vacuum
Fittings for Stainless Steel Tubing

For high-vacuum systems with tube sizes too large for quick-clamp (KF) fittings, choose these bolt-together fittings.

Ultra-High-Vacuum Flanges and
Fittings for Stainless Steel Tubing

Create access points in ultra-high-vacuum lines or chambers by bolting two same-size flanges together with a copper gasket between them. The flanges’ sharp edges dig into the copper gasket and form an extremely tight seal, which means they handle higher vacuum pressures than other high-vacuum fittings with rubber gaskets.

Claw-Clamp High-Vacuum
Fittings for Stainless Steel Tubing

An alternative to bolt-together fittings, these handle larger tube OD sizes and have higher vacuum ratings than quick-clamp fittings. Also known as ISO-K high-vacuum fittings, the clamps have claws that grab hold of fittings with flanged ends.

Metal Pipe and Pipe Fittings

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

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

Thick-Wall Stainless Steel Unthreaded Pipe

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

Extra-Thick-Wall Stainless Steel Unthreaded Pipe

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

Standard-Wall Stainless Steel
Threaded Pipe Nipples and Pipe

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

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.

Thick-Wall Steel Unthreaded Pipe

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

Extra-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 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 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 Aluminum
Unthreaded Pipe Nipples and Pipe

Typically used with standard-wall aluminum unthreaded pipe fittings.

Thick-Wall Aluminum Unthreaded Pipe

Typically used with thick-wall aluminum unthreaded pipe fittings.

Thin-Wall Aluminum Unthreaded Pipe

Typically used with thin-wall aluminum unthreaded pipe fittings.

Standard-Wall Brass Threaded Pipe Nipples and Pipe

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

Copper-Nickel Unthreaded Pipe

Also known as Pressure Class 200 pipe.