2 29/32" Air Hose | McMaster-Carr

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	Connection Style Connection Style

Quick Clamp

Flanged

	System of Measurement System of Measurement

Inch

	Flange OD Flange OD

2.16"

4 1/2"

	Trade Number Trade Number

	High Vacuum Connection Type High Vacuum Connection Type

ISO-KF

	Type Type

	Adapter

	For Tube OD For Tube OD

1 1/2"

2 1/2"

	For Tube Material For Tube Material

304/304L Stainless Steel

316/316L Stainless Steel

	Bolt Circle Diameter Bolt Circle Diameter

3 5/8"

	Maximum Vacuum Maximum Vacuum

1 × 10^-9 torr @
72° F

	Material Material

Stainless Steel

	Shape Shape

	Straight

	Bolt Hole Diameter Bolt Hole Diameter

21/64"

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

DFARS Specialty Metals
COTS-Exempt

	For Bolt Diameter For Bolt Diameter

5/16"

	Specifications Met Specifications Met

ISO

	Sterilize With Sterilize With

Steam (Autoclaving)

	Vacuum Rating Vacuum Rating

High

	Maximum Pressure Maximum Pressure

5 psi @ 72° F

	Maximum Temperature Maximum Temperature

250° to 499° F

	Minimum Temperature Minimum Temperature

-99° to 0° F

	Length Length	Show

2 29/32"

	Length Length	Hide

10 ft.; 1 ft. to 500 ft.

15 ft.; 1 ft. to 500 ft.

25 ft.; 1 ft. to 200 ft.

50 ft.; 1 ft. to 200 ft.

50 ft.; 1 ft. to 500 ft.

50 ft.; 1 ft. to 700 ft.

100 ft.; 1 ft. to 200 ft.

100 ft.; 1 ft. to 500 ft.

	Number of Bolt Holes Number of Bolt Holes

	Connection Type Connection Type

	Tube

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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.

For Use With:
Fittings with Gasket End: Air, Argon, Helium, Nitrogen
All Other Fittings: Air
Temperature Range: 0° to 300° F
Tubing: Use with 304/304L or 316/316L stainless steel
Specifications Met: ISO 2861

Instead of a gasket, these fittings have a special ring that is designed for high-vacuum applications, such as vacuum coating and heat treating, leak testing, and analyzing gases. Also known as KF, QF, and NW fittings, they are the most common type of connection in high-vacuum systems. Connect with a clamp and another quick-clamp fitting for fast, easy access to your line. To use fittings in pressure applications, use a pressure-rated ring (sold separately).

304 stainless steel fittings have very good corrosion resistance.

Note: To complete a connection, you’ll need two quick-clamp fittings, a ring, and a clamp (all sold separately).

Straight Adapters, Tube × Flanged Tube

Fittings with flanged end connect to pumps, valves or gauges that have flanged connections. Also known as conflat, CF, or UHV fittings, they have a higher vacuum rating than quick-clamp fittings, so these adapters allow you to connect between different levels of vacuum within a system. A copper gasket (sold separately) creates a tight seal between the two flanges.

Quick-Clamp Tube Connection				Flanged Tube Connection					Bolt Hole
For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Bolt Circle Dia.	Dia.	No. of	For Bolt Dia.	Bolts Included	Max. Vacuum	Max. Pressure		Each
1 1/2"	2.16"	40	ISO-KF	2 1/2"	4 1/2"	63	CF	3 5/8"	21/64"	8	5/16"	No	1 × 10 ^-9 torr @ 72° F	5 psi @ 72° F	00000000	0000000

Copper Gasket for 2 1/2" Tube OD (Flanged End)

0000000

Each

00000

Clamps

Clamp with Wing Nut

Spring-Loaded Clamp

Clamps (sold separately) tighten by hand. Spring-loaded clamps are also known as toggle clamps.

with Wing Nut
For Tube OD	For Flange OD	Trade Number	High Vacuum Connection Type	Material	Max. Vacuum	Lanyard Length		Each
1 1/2"	2.16"	40	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	__	0000000	000000
Spring Loaded
1 1/2"	2.16"	40	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	__	0000000	00000
Spring Loaded with Lanyard
1 1/2"	2.16"	40	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	5 3/4"	00000000	00000

Rings

Ring

Ring with Stainless Steel Screen

Ring with Aluminum Outer Ring

Rings (sold separately) consist of a stainless steel inner ring covered by a fluoroelastomer O-ring. Rings with screen have a stainless steel screen to filter out large particles. Pressure-rated rings have an aluminum outer ring to withstand extra pressure.

Rings
For Tube OD	For Flange OD	Trade Number	High Vacuum Connection Type	Inner Ring Material	Max. Vacuum	Max. Pressure		Each
1 1/2"	2.16"	40	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	Not Rated	0000000	000000
Rings with Stainless Steel Screen
1 1/2"	2.16"	40	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	Not Rated	00000000	00000
Rings with Aluminum Outer Ring
1 1/2"	2.16"	40	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	75 psi @ 72° F	0000000	00000

Hose

Rigid Hose

Flexible Hose

Hose (sold separately) absorbs moderate vibration

4 3/16" Lg.
For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Material	Max. Vacuum	Bend Radius	Flexibility		Each
1 1/2"	2.16"	40	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	__	Rigid	0000000	0000000
12" Lg.
1 1/2"	2.16"	40	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	2 1/2"	Flexible	00000000	000000
24" Lg.
1 1/2"	2.16"	40	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	2 1/2"	Flexible	00000000	000000
39" Lg.
1 1/2"	2.16"	40	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	2 1/2"	Flexible	00000000	000000

How to Identify and Measure Fittings

Quick-Clamp High-Vacuum Fittings for Stainless Steel Tubing