Vacuum Tube Caps | McMaster-Carr

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Shape

Tube OD

Material

Fitting Type

Fitting Connection

Pipe Size

Tube Material

System of Measurement

Elbow Type

For Use With

Acetic Acid (White Vinegar) (10% Concentration)

Connects To

Length

Tube Stem OD

Wall Thickness

Color

Pipe Material

For Tube Fabrication

Gender

Maximum Pressure @ Temperature

Appearance

REACH

Export Control Classification Number (ECCN)

2B999

EAR99

RoHS

Compliant

Compliant with Exemptions

Not Compliant

DFARS Specialty Metals

Exempt

Maximum Vacuum @ Temperature

26 in. Hg @ 72° F

28 in. Hg @ 72° F

29 in. Hg @ 72° F

1× 10^-13 Torr @ 72° F

1× 10^-11 Torr @ 72° F

1× 10^-8 Torr @ 72° F

1× 10^-7 Torr @ 72° F

1× 10^-6 Torr @ 72° F

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657 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.

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.

Flanged Ultra-High-Vacuum
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.

Quick-Connect High-Vacuum
Fittings for Stainless Steel Tubing

Twist these fittings onto high-vacuum tubing to quickly make sealed, high-vacuum connections without the need for clamping, welding, or tools.

Ultra-High-Polish Gasket Fittings
for Stainless Steel Tubing

Polished to at least a 15 Ra finish on the inside, these fittings have an ultra-smooth interior surface that helps prevent contamination. They are also known as ultra-high-purity 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.

Claw-Clamp High-Vacuum
Fittings for Stainless Steel Tubing

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

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.

Compression Fittings for Steel Tubing

A single sleeve (ferrule) bites into tubing as you tighten the nut, creating a strong seal.

Quick-Clamp High-Vacuum
Fittings for Aluminum Tubing

For use in high-vacuum systems, these fittings use a metal reinforced O-ring to create an airtight seal. Also known as KF, QF, and NW fittings, they’re used for high-vacuum applications such as vacuum coating and heat treating, leak testing, and analyzing gases.

Tube Fittings for Plastic and Rubber Tubing

Push-to-Connect Tube Fittings for Air

Nickel-Plated Brass Push-to-Connect
Tube Fittings for Air

Made of nickel-plated brass, these fittings have better corrosion resistance than unplated brass fittings.

Moisture-Resistant Push-to-Connect
Tube Fittings for Air and Water

These fittings won’t absorb moisture, so they’re good for water and high-humidity air applications.

Weld-Spatter-Resistant Push-to-Connect
Tube Fittings for Air and Water

Designed for use in welding applications, these fittings are flame retardant.

Low-Temperature D.O.T.
Push-to-Connect Tube Fittings for Air

Connect air brake lines with fittings that won’t crack in sub-zero temperatures. They meet Department of Transportation FMVSS 571 safety standards, so they’re often used in commercial trucks and trailers.

Brass Low-Pressure Barbed
Tube Fittings for Air and Water

Fittings have good corrosion resistance.

Push-to-Connect Tube
Fittings for Hot Drinking Water

Fittings can withstand temperatures up to 200° F.

Socket-Connect Fittings for
Plastic Tubing—Drinking Water

Use these nuts with brass compression fittings to create a seal on plastic tubing. They meet NSF/ANSI 61 for use with drinking water.

Plastic Push-to-Connect Tube Fittings for Chemicals

Also known as instant fittings, these chemical-resistant plastic fittings connect to tubing with a push. An internal gripping ring holds the tubing tight.

Push-to-Connect Fittings for
Plastic Tubing—High-Purity

Also known as instant fittings, they connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. Use in applications up to 140 psi.

Plastic Pipe and Pipe Fittings for Water

Thick-Wall Plastic Pipe Fittings for Water

Connect these fittings to Schedule 80 pipe. With thicker, stronger walls than standard-wall fittings, they can handle heavy duty supply applications, such as water processing, wastewater treatment, and irrigation.

Thick-Wall Plastic Pipe Flanges for Water

Bolt two same-size flanges together with a gasket to create an access point within a line. They are also known as Pressure Class 150 flanges. They have thick, strong walls to handle heavy duty industrial plumbing and water supply applications, such as water processing, waste water treatment, and irrigation.

CPVC Pipe Fittings for Hot Water

Connect to CPVC pipe for use in high-temperature plumbing and water supply applications.

CPVC Pipe Flanges for Hot Water

Bolt two same-size flanges together with a gasket to create an access point within a line. They are also known as Pressure Class 150 flanges. Use in high-temperature plumbing and water supply applications up to 200° F.