1.57" OD Flanges | McMaster-Carr

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	Type Type


Adapter	Connector

Reducer

	Connection Style Connection Style

	Trade Number Trade Number

	Shape Shape


Straight	90° Elbow

Tee	45° Elbow

Cross

	System of Measurement System of Measurement

Inch

	For Tube OD For Tube OD

	Flange OD Flange OD	Show

1.57"

	Flange OD Flange OD	Hide

	Material Material

Aluminum

Stainless Steel

	Connection Type Connection Type


Pipe	Tube

Hose

	High Vacuum Connection Type High Vacuum Connection Type

ISO-KF

ISO-K

	For Tube Material For Tube Material

Stainless Steel

Glass

	Pipe Size Pipe Size

	Maximum Vacuum Maximum Vacuum

1 × 10^-9 torr @
72° F

1 × 10^-8 torr @
72° F

1 × 10^-7 torr @
72° F

	Thread Type Thread Type

NPT

	Length Length

	Maximum Temperature Maximum Temperature

Less than 250° F

250° to 499° F

	Minimum Temperature Minimum Temperature

-99° to 0° F

	Sterilize With Sterilize With

Steam (Autoclaving)

Not Recommended

	Vacuum Rating Vacuum Rating

High

	Gender Gender

Female

Male

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

DFARS Specialty Metals
COTS-Exempt

	Specifications Met Specifications Met

ISO

	Maximum Pressure Maximum Pressure

5 psi @ 72° F

Not Rated

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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).

Aluminum fittings have good corrosion resistance and are lighter than stainless steel fittings. 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 × Male Threaded Pipe

Fittings with threaded pipe end require PTFE tape for sealing the threads.

NPT Threads
For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Pipe Size	Material	Max. Vacuum		Each
1"	1.57"	25	ISO-KF	1/8	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	00000000	000000
1"	1.57"	25	ISO-KF	1/4	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	0000000	00000
1"	1.57"	25	ISO-KF	1/2	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	00000000	00000
1"	1.57"	25	ISO-KF	3/4	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	00000000	000000

Straight Adapters, Tube × Female Threaded Pipe

Fittings with threaded pipe end require PTFE tape for sealing the threads.

NPT Threads
For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Pipe Size	Material	Max. Vacuum		Each
1"	1.57"	25	ISO-KF	1/8	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	00000000	000000
1"	1.57"	25	ISO-KF	1/4	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	0000000	00000

Straight Adapters, Tube × Barbed Hose

Fittings with barbed hose end connect flexible hose or tubing to your system. Secure with a hose clamp (sold separately).

For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	For Hose ID	Material	Max. Vacuum		Each
1"	1.57"	25	ISO-KF	7/8"	Aluminum	1 × 10 ^-7 torr @ 72° F	0000000	000000

Straight Adapters, Tube × Butt-Weld Tube

Fittings with butt-weld end weld to tubing for a permanent connection. Fittings with butt-weld end are also known as ferrules.

For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Wall Thick.	Material	Max. Vacuum	Lg.		Each
1"	1.57"	25	ISO-KF	0.065"	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	1/2"	0000000	000000
1"	1.57"	25	ISO-KF	0.065"	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	1 9/16"	0000000	00000

Straight Adapters, Tube × Socket-Connect Tube

Fittings with socket-connect end weld to tubing for a permanent connection.

For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Material	Max. Vacuum		Each
1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	00000000	000000

Straight Adapters, Tube × Yor-Lok Tube

Fittings with Yor-Lok end connect plain-end stainless steel tubing using a nut with two sleeves that bite into the tubing to create a strong seal. Yor-Lok connections are manufactured to tight tolerances—use them for high-pressure applications such as supplying gas or liquid to a high-vacuum chamber. Also known as instrumentation fittings.

Quick-Clamp Tube Connection
For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	For Tube OD (Yor-Lok)	Max. Vacuum	Max. Pressure	Compatible With		Each
1"	1.57"	25	ISO-KF	1/4"	1 × 10 ^-9 torr @ 72° F	5 psi @ 72° F	Let-Lok, Parker A-Lok, Swagelok®	00000000	000000
1"	1.57"	25	ISO-KF	3/8"	1 × 10 ^-9 torr @ 72° F	5 psi @ 72° F	Let-Lok, Parker A-Lok, Swagelok®	00000000	00000
1"	1.57"	25	ISO-KF	1/2"	1 × 10 ^-9 torr @ 72° F	5 psi @ 72° F	Let-Lok, Parker A-Lok, Swagelok®	00000000	000000

Straight Adapters, Tube × Male Gasket Tube

Fittings with gasket end connect with a stainless steel gasket (sold separately) instead of a rubber one, generating fewer particles to create a stronger high-vacuum seal. Their interior is ultra-smooth to attract fewer contaminants. These adapters are commonly used to add gases such as helium, argon, or nitrogen into high-vacuum systems. Also known as VCR fittings.

Quick-Clamp Tube Connection
For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	For Tube OD (Gasket)	Max. Vacuum	Max. Pressure	Compatible With		Each
1"	1.57"	25	ISO-KF	1/4"	1 × 10 ^-9 torr @ 72° F	5 psi @ 72° F	Swagelok® VCR	00000000	000000
1"	1.57"	25	ISO-KF	1/2"	1 × 10 ^-9 torr @ 72° F	5 psi @ 72° F	Swagelok® VCR	00000000	000000

Gasket for 1/2" Tube OD (Gasket End)	0000000	Each	00000
Gasket for 1/4" Tube OD (Gasket End)	0000000	Each	0000

Straight Adapters, Tube × Female Gasket Tube

Quick-Clamp Tube Connection
For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	For Tube OD (Gasket)	Max. Vacuum	Max. Pressure	Compatible With		Each
1"	1.57"	25	ISO-KF	1/4"	1 × 10 ^-9 torr @ 72° F	5 psi @ 72° F	Swagelok® VCR	00000000	000000
1"	1.57"	25	ISO-KF	1/2"	1 × 10 ^-9 torr @ 72° F	5 psi @ 72° F	Swagelok® VCR	00000000	000000

Gasket for 1/2" Tube OD (Gasket End)	0000000	Each	00000
Gasket for 1/4" Tube OD (Gasket End)	0000000	Each	0000

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"	1.57"	25	ISO-KF	3/4"	1 21/64"	16	CF	1 1/16"	11/64"	6	5/32"	No	1 × 10 ^-9 torr @ 72° F	5 psi @ 72° F	00000000	000000
1"	1.57"	25	ISO-KF	1 1/2"	2 3/4"	40	CF	2 5/16"	17/64"	6	1/4"	No	1 × 10 ^-9 torr @ 72° F	5 psi @ 72° F	00000000	000000

Copper Gasket for 1 1/2" Tube OD (Flanged End)	0000000	Each	00000
Copper Gasket for 3/4" Tube OD (Flanged End)	0000000	Each	0000

Straight Adapters, Tube × Claw-Clamp Tube

Fittings with claw-clamp end are often used to connect high-vacuum components with large-diameter connections, such as coating or heat-treating equipment, to components with smaller connections such as gauges, filters, or pumps. Also known as ISO-K fittings, they connect with four claw clamps and a ring (sold separately).

Quick-Clamp Tube Connection				Claw-Clamp Tube Connection
For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Max. Vacuum	Max. Pressure		Each
1"	1.57"	25	ISO-KF	2 1/2"	3.74"	63	ISO-K	1 × 10 ^-9 torr @ 72° F	5 psi @ 72° F	00000000	0000000

Double-Claw Clamp	Each	00000
Ring for 2 1/2" Tube OD (Claw-Clamp End)	Each	00000
Double-Claw Clamp	Each	0000
Double-Claw Clamp	Each	0000
Double-Claw Clamp	Each	0000
Double-Claw Clamp	Each	0000
Double-Claw Clamp	Each	0000
Double-Claw Clamp	Each	0000

Straight Connectors, Tube

For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Lg.	Material	Max. Vacuum		Each
1"	1.57"	25	ISO-KF	3 7/8"	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	00000000	000000
1"	1.57"	25	ISO-KF	12 1/2"	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	00000000	00000

Straight Reducers, Tube

Tube Connection (A)				Tube Connection (B)
For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Material	Max. Vacuum		Each
1"	1.57"	25	ISO-KF	3/4"	1.18"	16	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	00000000	000000
1 1/2"	2.16"	40	ISO-KF	1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	0000000	00000
2"	2.95"	50	ISO-KF	1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	0000000	00000

90° Elbow Connectors, Tube

For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Material	Max. Vacuum		Each
1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	0000000	000000

45° Elbow Connectors, Tube

For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Material	Max. Vacuum		Each
1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	0000000	000000

Tee Connectors, Tube

For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Material	Max. Vacuum		Each
1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	0000000	0000000

Inline Tee Reducers, Tube

Inline tees are also known as branch tees.

Tube Connection (A)				Tube Connection (B)
For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Material	Max. Vacuum		Each
1"	1.57"	25	ISO-KF	3/4"	1.18"	16	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	00000000	0000000
1 1/2"	2.16"	40	ISO-KF	1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	00000000	000000
2"	2.95"	50	ISO-KF	1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	00000000	000000

Cross Connectors, Tube

For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Material	Max. Vacuum		Each
1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	0000000	0000000

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
1/2"	1.18"	10	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	__	00000000	00000
1/2", 3/4"	1.18"	10, 16	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	__	00000000	0000
3/4"	1.18"	16	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	__	00000000	0000
1"	1.57"	25	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	__	0000000	00000
1 1/2"	2.16"	40	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	__	0000000	00000
2"	2.95"	50	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	__	0000000	00000
Spring Loaded
1/2"	1.18"	10	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	__	0000000	00000
1/2", 3/4"	1.18"	10, 16	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	__	0000000	00000
3/4"	1.18"	16	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	__	0000000	00000
1"	1.57"	25	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	__	0000000	00000
1 1/2"	2.16"	40	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	__	0000000	00000
2"	2.95"	50	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	__	0000000	00000
Spring Loaded with Lanyard
3/4"	1.18"	16	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	5 3/4"	00000000	00000
1"	1.57"	25	ISO-KF	Aluminum	1 × 10 ^-7 torr @ 72° F	5 3/4"	00000000	00000
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
3/4"	1.18"	16	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	Not Rated	00000000	00000
1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	Not Rated	0000000	0000
1 1/2"	2.16"	40	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	Not Rated	0000000	00000
2"	2.95"	50	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	Not Rated	0000000	00000
Rings with Stainless Steel Screen
3/4"	1.18"	16	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	Not Rated	00000000	00000
1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	Not Rated	00000000	00000
1 1/2"	2.16"	40	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	Not Rated	00000000	00000
2"	2.95"	50	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	Not Rated	00000000	00000
Rings with Aluminum Outer Ring
1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	100 psi @ 72° F	0000000	00000
1 1/2"	2.16"	40	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	75 psi @ 72° F	0000000	00000
2"	2.95"	50	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	50 psi @ 72° F	0000000	00000

Hose

Rigid Hose

Flexible Hose

Hose (sold separately) absorbs moderate vibration

3 3/16" Lg.
For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Material	Max. Vacuum	Bend Radius	Flexibility		Each
3/4"	1.18"	16	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	__	Rigid	0000000	000000
4 3/16" Lg.
1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	__	Rigid	0000000	00000
1 1/2"	2.16"	40	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	__	Rigid	0000000	000000
2"	2.95"	50	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	__	Rigid	0000000	000000
12" Lg.
3/4"	1.18"	16	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	1 5/8"	Flexible	00000000	000000
1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	1 3/8"	Flexible	00000000	000000
1 1/2"	2.16"	40	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	2 1/2"	Flexible	00000000	000000
2"	2.95"	50	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	3 1/4"	Flexible	00000000	000000
24" Lg.
3/4"	1.18"	16	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	1 5/8"	Flexible	00000000	000000
1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	1 3/8"	Flexible	00000000	000000
1 1/2"	2.16"	40	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	2 1/2"	Flexible	00000000	000000
2"	2.95"	50	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	3 1/4"	Flexible	00000000	000000
39" Lg.
3/4"	1.18"	16	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	1 5/8"	Flexible	00000000	000000
1"	1.57"	25	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	1 3/8"	Flexible	00000000	000000
1 1/2"	2.16"	40	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	2 1/2"	Flexible	00000000	000000
2"	2.95"	50	ISO-KF	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	3 1/4"	Flexible	00000000	000000

Valves with Shut-Off

Valves (sold separately) are also known as vacuum isolation valves. They connect to a vacuum system so you can install gauges, release gases, and remove air. They operate manually and have a compact body that fits easily into tight spaces.

Actuation	For Tube OD	Flange OD	Trade Number	Max. Vacuum	Body Material	Overall Ht.	Overall Lg.		Each
Manual	3/4"	1 3/16"	16	10 ^-7 torr @ 72° F	304 Stainless Steel	4 1/8"	2 1/4"	00000000	0000000
Manual	1"	1 9/16"	25	10 ^-7 torr @ 72° F	304 Stainless Steel	5 5/8"	3"	00000000	000000
Manual	1 1/2"	2 1/8"	40	10 ^-7 torr @ 72° F	304 Stainless Steel	6 3/8"	3 7/8"	00000000	000000
Manual	2"	2 15/16"	50	10 ^-7 torr @ 72° F	304 Stainless Steel	8"	4 1/2"	00000000	000000

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. To connect, insert your tubing into the fitting and twist the collar on the end of the fitting; an O-ring on the inside of the fitting compresses to form the seal. Also known as quick-disconnects, they're as easy to twist off as they are to twist on. Not for use in pressure applications.

Adapters have a quick-connect fitting on one side and a quick-clamp fitting on the other. Use them to attach and remove components for one-off uses or to adapt your quick-clamp system to connect to glass tubing. Quick-clamp fittings are also known as KF, QF, and NW fittings; they require a clamp and ring (sold separately) to complete the connection.

Straight Adapters, Quick Connect × Quick Clamp

Straight Adapter, Quick Connect × Quick Clamp

Adapters
	Quick Clamp Tube Connection											Replacement O-Rings
For Tube OD (Quick Connect)	For Tube OD	Flange OD	Trade Number	High Vacuum Connection Type	Wall Thick.	Max. Vacuum	Material	O-Ring Material	Temp. Range, °F		Each		Each
1/2"	1"	1.57"	25	ISO-KF	0.118"	1 × 10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	0° to 175°	0000000	000000	0000000	00000
3/4"	1"	1.57"	25	ISO-KF	0.055"	1 × 10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	0° to 175°	0000000	00000	0000000	0000
1"	1"	1.57"	25	ISO-KF	0.055"	1 × 10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	0° to 175°	0000000	000000	0000000	0000

Clamps

Clamp with Wing Nut

with Wing Nut
For Tube OD	For Flange OD	Trade Number	High Vacuum Connection Type	Material	Nut Material	Max. Vacuum	Temp. Range, °F	Specifications Met		Each
1"	1.57"	25	ISO-KF	Aluminum	Zinc Alloy	1 × 10 ^-7 torr @ 72° F	0° to 300°	ISO 2861	0000000	000000

Rings

Ring

				Material
For Tube OD	For Flange OD	Trade Number	High Vacuum Connection Type	O-Ring	Inner Ring	Max. Vacuum	Temp. Range, °F	Specifications Met		Each
1"	1.57"	25	ISO-KF	Fluoroelastomer Rubber	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	0° to 300°	ISO 2861	0000000	00000

Through-Wall Fittings for High-Vacuum Chambers

For Use With: See table
Environment Temperature Range: 32° to 300° F
Process Temperature Range: -325° to 995° F
Tubing: Use with 304/304L or 316/316L stainless steel
Specifications Met: See table

Also known as feedthroughs, these fittings transfer liquids, cryogenic liquids, or gasses into high-vacuum chambers for coating, cooling, and leak-testing applications without losing vacuum pressure. Consisting of high-vacuum fittings, metal tubing, and Yor-lok tube fittings, these complete assemblies come ready to install. The quick-clamp (KF) or flanged (CF) high-vacuum fittings form a tight seal on chamber walls. On each end, the Yor-lok fittings include a nut and two sleeves that grip your system’s stainless steel tubing for a leak- and gas-tight connection. The entire assembly is stainless steel so it resists rusting. Not for use in pressure applications.

Quick-clamp fittings meet ISO (International Standards Organization) 2861, which specifies the dimensions of quick-clamp high-vacuum fittings, clamps, and rings to ensure vacuum tightness. These fittings require a clamp and ring (each sold separately) to complete the connection.

Quick-Clamp (ISO-KF) Chamber Connection with Yor-Lok Fittings

Quick Clamp Shown Installed

Quick Clamp

		For Tube
Flange OD	Trade Number	OD	Wall Thick.	Lg.	Max. Vacuum	Material	Specifications Met		Each
For Use With Liquid Helium, Liquid Methane, Liquid Nitrogen, Liquid Oxygen
1.57"	25	1/4"	0.028"-0.095"	9"	1 × 10 ^-8 torr @ 72° F	304 Stainless Steel	ISO 2861	0000000	0000000

Clamps for Quick-Clamp (ISO-KF) Chamber Connection

Clamp with Wing Nut

With Wing Nut
For Flange OD	Trade Number	Material	Max. Vacuum		Each
1.57"	25	Aluminum	1 × 10 ^-7 torr @ 72° F	0000000	000000

Rings for Quick-Clamp (ISO-KF) Chamber Connection

Ring

		Material
For Flange OD	Trade Number	O-Ring	Inner Ring	Max. Vacuum		Each
1.57"	25	Fluoroelastomer Rubber	304 Stainless Steel	1 × 10 ^-7 torr @ 72° F	0000000	00000

How to Identify and Measure Fittings

Quick-Clamp High-Vacuum Fittings for Stainless Steel Tubing

Quick-Connect High-Vacuum Fittings for Stainless Steel Tubing

Through-Wall Fittings for High-Vacuum Chambers