KF Tube Flanges | McMaster-Carr

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High-Vacuum Flange Size

Fitting Connection

Shape

Fitting Type

Tube OD

Material

Flange OD

Tube Material

Connects To

Pipe Size

High-Vacuum Connection Type

Length

For Use With

Gender

Maximum Vacuum @ Temperature

1× 10^-9 Torr @ 72° F

1× 10^-8 Torr @ 72° F

1× 10^-7 Torr @ 72° F

Clamp Type

Hose ID

Maximum Temperature

Maximum Pressure @ Temperature

REACH

RoHS

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

Minimum Temperature

Sterilize With

307 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.

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.

Rings for Quick-Clamp High-Vacuum
Fittings for Stainless Steel Tubing

Use these rings with quick-clamp high-vacuum fittings.

Clamps for Quick-Clamp High-Vacuum Fittings

Connect quick-clamp fittings in high-vacuum applications.

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.

Through-Wall Fittings for High-Vacuum Chambers

Transfer liquids and gasses into high-vacuum chambers with these assembled fittings, also known as feedthroughs.

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.

Rings for Quick-Clamp High-Vacuum
Fittings for Aluminum Tubing

Create an airtight seal between quick-clamp (ISO-KF) fittings—these rings complete high-vacuum connections.

High-Vacuum Exhaust Hose
with Quick-Clamp Fittings

Connect to high-vacuum pumps to route exhaust fumes out of your work area. Also known as roughing hose.

Abrasion-Resistant High-Vacuum
Hose with Quick-Clamp Fittings

A braided exterior protects this hose from abrasion and over-bending. Also known as bellows, the ribbed interior makes it flexible enough to connect high-vacuum components that aren't directly aligned.

On/Off Valves

On/Off Valves with High-Vacuum Fittings

To create a tight seal in vacuum conditions higher than 29.9” Hg, these valves have ultra-high-vacuum tube fitting connections, which are also known as KF, QF, and NW fittings. They are often used in applications such as vacuum coating and heat treating, leak testing, and analyzing gases.

Gradual On/Off Valves with
Quick-Clamp Fittings for High Vacuum

Also known as vacuum isolation valves, these block flow so you can install and remove gauges from your system. They can also be used to add or vent gases in high-vacuum systems.