4 1/2" OD Flanges | McMaster-Carr

Clear All

	Type Type


Flange	Adapter

Cap	Connector

	System of Measurement System of Measurement

Inch

	Flange OD Flange OD	Show

4 1/2"

	Flange OD Flange OD	Hide

	Connection Style Connection Style

	Material Material

Stainless Steel

Steel

	For Tube OD For Tube OD

1 1/2"

2 1/2"

	Shape Shape


Straight	Cap/Plug

90° Elbow	Tee

	Flanged Connection Surface Flanged Connection Surface


Raised	Flat

	Number of Bolt Holes Number of Bolt Holes

	For Tube Material For Tube Material

316/316L Stainless Steel

304/304L Stainless Steel

	High Vacuum Connection Type High Vacuum Connection Type

ISO-KF

	Bolt Circle Diameter Bolt Circle Diameter

3 1/2"

3 5/8"

	High-Vacuum Flange Size High-Vacuum Flange Size

	Connection Type Connection Type


Pipe	Tube

	Maximum Vacuum Maximum Vacuum

1 × 10^-13 torr @
72° F

1 × 10^-9 torr @
72° F

	Flange Type Flange Type

Fixed

Rotating

	Maximum Temperature Maximum Temperature

250° to 499° F

750° to 999° F

	For Use With For Use With

	Specifications Met Specifications Met

ANSI

ASME

ASTM

International Fuel Gas Code

ISO

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

DFARS Specialty Metals
COTS-Exempt

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Maximum Pressure Maximum Pressure

5 psi @ 72° F

125 psi @ 72° F

Not Rated

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Vacuum Rating Vacuum Rating

High

Forward

How can we improve?

23 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.

For Use On:
EPDM Rubber O-Ring: Ethylene Glycol, Propylene Glycol, Water
Buna-N Rubber O-Ring: Air, Lubricants, Propane, Fuel Oil, Natural Gas, Diesel Fuel
Specifications Met:
EPDM Rubber O-Ring: ASME B31,1, ASME B31.3, ASME B31.9, FM 1920, UL 213
Buna-N Rubber O-Ring: ASME B31.1, ASME B31.3, ASME B31.9, ANSI LC4/CSA 6.32, International Fuel Gas Code
Maximum Pressure:
EPDM Rubber O-Ring: 200 psi @ 72° F
Buna-N Rubber O-Ring: 125 psi @ 72° F
Pipe Nipples and Pipe: Use Schedule 40 Steel
Flanges: Use Class 150 Steel

Crimp these fittings onto steel pipe to form a tightly sealed connection that’s faster than threading or welding and doesn’t require heat. An internal gripping ring and rubber O-ring create a secure seal when crimped. They are designed to leak if fittings have not been crimped; a colored dot marks the leak path so it's easy to spot unsealed connections. These steel fittings are coated in zinc-nickel to resist corrosion, but will rust if frequently exposed to saltwater or harsh chemicals. They are comparable to Viega MegaPress steel fittings.

Fittings meet ANSI/ASME B31 code requirements for use in pressure piping systems.

Buna-N rubber O-rings hold up to natural gas, propane, diesel fuel, lubricants, and other oils. Fittings with these O-rings are often used in fuel gas systems and air lines. They meet the ANSI LC4/CSA 6.32 standard for fuel gas systems and comply with the International Fuel Gas Code.

Bolt two same-size flanges together with a gasket (sold separately) to create a removable connection to valves, pumps and other equipment.

For technical drawings and 3-D models, click on a part number.

Flanged Adapters, Female Press Connect × Flanged

Flanged Adapter

				Bolt Hole					Buna-N Rubber O-Ring
Pipe Size	Socket Dp.	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Pressure Class	Lg.		Each
1 1/4	0.375"	4 1/2"	1/2"	5/8"	4	3 1/2"	150	3 9/16"	00000000	0000000

Crimping Tools

Crimping Tool

Crimping tools seal fittings in less than five seconds. These tools are cordless, so you can take them to any job. Connect the jaw or ring that matches your pipe size to these tools, then pull the trigger to crimp the fitting. The pivoting head lets you access connections from any angle.

	Battery
Voltage	No. Included	Cap., amp-hrs.	Battery Charger Included	Battery Charging Time, min.	Compatible With		Each
18V DC	2	3	Yes	39	Viega MegaPress Viega ProPress Viega ProPress XL-C	00000000	000000000

Jaw and Ring Sets

Jaw and Ring Set

Jaw and ring sets include three jaws, three rings, and one ring actuator jaw. Jaws are for pipe sizes 1/2 to 1; they fit directly into the crimping tool. Rings are for pipe sizes 1 1/4 to 2; clip the ring around the fitting and use the ring actuator jaw and crimping tool to press the open ends together.

For Pipe
Size	Material	For Manufacturer	For Manufacturer Model No.	Compatible With	Includes	Container Type		Each
1/2, 3/4, 1, 1 1/4, 1 1/2, 2	Stainless Steel, Steel	Ridgid	RP 340	Viega MegaPress	One Ring Actuator Jaw Three Jaws (1/2-1 Pipe Size) Three Rings (1 1/4-2 Pipe Size)	Carrying Case	00000000	000000000

Quick-Clamp High-Vacuum Fittings for Stainless Steel Tubing

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).

For technical drawings and 3-D models, click on a part number.

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	High-Vacuum Flange Size	High Vacuum Connection Type	For Tube OD	Flange OD	High-Vacuum Flange Size	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 tighten by hand. Spring-loaded clamps are also known as toggle clamps.

with Wing Nut
For Tube OD	For Flange OD	For High-Vacuum Flange Size	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

Use these rings with quick-clamp high-vacuum fittings. They consist of a stainless steel inner ring covered by a fluoroelastomer O-ring.

Rings
For Tube OD	For Flange OD	For High-Vacuum Flange Size	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 absorbs moderate vibration

4 3/16" Lg.
For Tube OD	Flange OD	High-Vacuum Flange Size	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

Ultra-High-Vacuum Flanges and Fittings for Stainless Steel Tubing

For Use With: Air
Temperature Range:
Flanges: -300° to 800° F
Gaskets: Not Rated
Tubing: Use with 304/304L and 316/316L stainless steel
Specifications Met:
Flanges: ASTM A240, ASTM E45, ASTM E12
Gaskets: ASTM B152-179, ASTM F68

Create access points in ultra-high-vacuum lines or chambers by bolting two same-size flanges together with a copper gasket (sold separately) 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. Also known as CF, Conflat, and UHV fittings, use them in vacuum coating, heat treating, and drying applications, as well as for leak testing and analyzing gases. They’re stainless steel so they resist rusting.

Fittings with a rotating flange turn so you can easily match up the bolt holes with another flange that may be misaligned.

Butt-weld flanges provide a flush connection for smooth flow through your line.

Socket-connect flanges are easier to weld than butt-weld flanges because they don’t need to align perfectly to tubing; insert the tubing into the socket end and weld together.

Caps are also known as blind flanges.

Bolt kits are required to make a complete connection.

For technical drawings and 3-D models, click on a part number.

Straight Connectors, Flanged

Straight Connector, Flanged

					Bolt Hole
For Tube OD	Flange OD	High-Vacuum Flange Size	High Vacuum Connection Type	Bolt Circle Dia.	Dia.	No. of	Bolts Included	No. of Bolt Kits Required	Lg.	Max. Vacuum	Material	Appearance		Each
Fixed × Rotating
2 1/2"	4 1/2"	63	CF	3 5/8"	21/64"	8	No	2	6 11/16"	1 × 10 ^-13 torr @72° F	304 Stainless Steel	Polished	0000000	0000000

90° Elbow Connectors, Flanged

Elbow Connector, Flanged

					Bolt Hole
For Tube OD	Flange OD	High-Vacuum Flange Size	High Vacuum Connection Type	Bolt Circle Dia.	Dia.	No. of	Bolts Included	No. of Bolt Kits Required	Max. Vacuum	Material	Appearance		Each
Rotating
2 1/2"	4 1/2"	63	CF	3 5/8"	21/64"	8	No	2	1 × 10 ^-13 torr @72° F	304 Stainless Steel	Polished	0000000	0000000

Butt-Weld Flanges

Butt-Weld Fixed Flange

Butt-Weld Tube Connection		Flanged Tube Connection					Bolt Hole
For Tube OD	Wall Thick.	For Tube OD	Flange OD	High-Vacuum Flange Size	High Vacuum Connection Type	Bolt Circle Dia.	Dia.	No. of	Bolts Included	No. of Bolt Kits Required	Lg.	Max. Vacuum	Material	Appearance		Each
Fixed
2 1/2"	0.065"	2 1/2"	4 1/2"	63	CF	3 5/8"	21/64"	8	No	1	3 3/8"	1 × 10 ^-13 torr @72° F	304 Stainless Steel	Polished	0000000	0000000

Socket-Connect Flanges

Socket-Connect Fixed Flange

Socket-Connect Rotating Flange

Socket-Connect Tube Connection		Flanged Tube Connection					Bolt Hole
For Tube OD	Socket Dp.	For Tube OD	Flange OD	High-Vacuum Flange Size	High Vacuum Connection Type	Bolt Circle Dia.	Dia.	No. of	Bolts Included	No. of Bolt Kits Required	Lg.	Max. Vacuum	Material	Appearance		Each
Fixed
2 1/2"	3/8"	2 1/2"	4 1/2"	63	CF	3 5/8"	21/64"	8	No	1	11/16"	1 × 10 ^-13 torr @72° F	304 Stainless Steel	Polished	0000000	000000
Rotating
2 1/2"	3/8"	2 1/2"	4 1/2"	63	CF	3 5/8"	21/64"	8	No	1	11/16"	1 × 10 ^-13 torr @72° F	304 Stainless Steel	Polished	0000000	00000

Tee Connectors, Flanged

Tee Connector, Flanged

					Bolt Hole
For Tube OD	Flange OD	High-Vacuum Flange Size	High Vacuum Connection Type	Bolt Circle Dia.	Dia.	No. of	Bolts Included	No. of Bolt Kits Required	Max. Vacuum	Material	Appearance		Each
Fixed × Rotating × Rotating
2 1/2"	4 1/2"	63	CF	3 5/8"	21/64"	8	No	3	1 × 10 ^-13 torr @72° F	304 Stainless Steel	Polished	0000000	0000000

Caps

Cap

					Bolt Hole
For Tube OD	Flange OD	High-Vacuum Flange Size	High Vacuum Connection Type	Bolt Circle Dia.	Dia.	No. of	Bolts Included	No. of Bolt Kits Required	Lg.	Max. Vacuum	Material	Appearance		Each
Fixed
2 1/2"	4 1/2"	63	CF	3 5/8"	21/64"	8	No	1	11/16"	1 × 10 ^-13 torr @72° F	304 Stainless Steel	Polished	0000000	000000

Gaskets

Gasket

For Tube OD	For Flange OD	Gasket Material	Specifications Met		Each
2 1/2"	4 1/2"	Copper	ASTM F68	0000000	00000

Bolt Kits

Bolt Kit

For Flange OD	For High-Vacuum Flange Size	Bolt Dia.	Thread Size	No. of Bolts Included	No. of Nuts Included	No. of Washers Included	Bolt Material		Each
4 1/2"	63	5/16"	5/16"-24	8	8	16	18-8 Stainless Steel	0000000	000000

Email Us

How to Identify and Measure Fittings

Low-Pressure Press-Connect Steel Unthreaded Pipe Fittings

Quick-Clamp High-Vacuum Fittings for Stainless Steel Tubing

Ultra-High-Vacuum Flanges and Fittings for Stainless Steel Tubing