KF Clamps | McMaster-Carr

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High-Vacuum Flange Size

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311 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.

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

Connect quick-clamp fittings in high-vacuum applications.

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

Use these rings with quick-clamp high-vacuum 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.

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.

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.

On/Off Valves with Sanitary Quick-Clamp
Fittings for Food and Beverage

To maintain sanitary standards in food, beverage, and dairy systems that require frequent cleaning, these valves are made of FDA compliant materials. Electropolished to a 32 Ra finish, they have smooth internal surfaces that prevent product buildup and inhibit bacteria growth. All have sanitary quick-clamp fittings for easy disassembly.

Sanitary On/Off Valves for Food and Beverage

3-A certified as meeting sanitary design standards, these valves control the flow of liquids in food, dairy, pharmaceutical, and cosmetic plants.

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.

Motor-Driven On/Off Valves for Food and Beverage

For food and beverage systems that require frequent cleaning, these valves have polished internal surfaces and sanitary quick-clamp connections for easy disassembly.

Sanitary Air-Driven On/Off Valves

Use air pressure to automatically control the flow of liquids in sanitary environments, such as food and beverage processing plants.

Air-Driven On/Off Valves for Food and Beverage

For food and beverage applications that require frequent cleaning, these valves have quick-clamp connections, polished internal surfaces, and a three-piece bolted body for easy disassembly.