Orifice Flanges | McMaster-Carr

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Pipe Size

Material

Compressed Non-Asbestos Synthetic Fiber

Fitting Connection

For Use With

Fitting Type

Pipe Material

316/316L Stainless Steel

Carbon Steel

Fitting Material

316/316L Stainless Steel

For Flange Pipe Size

Orifice Diameter

Number of Bolt Holes

Specifications Met

Export Control Classification Number (ECCN)

2B999

EAR99

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

RoHS

REACH

DFARS Specialty Metals

Exempt

For Orifice Flange ANSI Class

Flange OD

Thickness

For Orifice Flange Surface

Flat

Raised

Maximum Pressure @ Temperature

Wall Thickness

Weight

Airflow @ Pressure

1,037.5 scfm @ 40 psi

Water Flow @ Pressure

77 Products

About Measuring Fittings

Measure the threaded ends of your fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

Flange Unions

Measure, throttle, and regulate the flow of liquids and gases in your line by adding an orifice plate to these unions. They consist of two flange halves, plus all of the components needed to connect them together. Tighten the jack bolts to separate the flange halves to inspect or replace the orifice plate.

To throttle flow, mount an orifice plate between the two flanges. The orifice plate restricts the flow in order to regulate it.

To measure flow, build the same assembly, except you’ll also connect a differential pressure gauge or transmitter to both flange halves using the threaded ports. Your gauge or transmitter will measure the difference between the pressure before and after the orifice plate. The pressure difference is proportional to flow rate, so you can use that measurement to calculate your line’s flow rate.

Butt Weld × Flanged


Assembled	Exploded

Butt-weld flanges are also known as weld-neck flanges; the flange neck has a beveled end that, when flush to pipe, creates a trough for a strong weld.

For 316/316L Stainless Steel Fittings—316/316L stainless steel flanges have excellent corrosion resistance.

ASME B16.36—Flanges that meet ASME B16.36 adhere to specifications and testing requirements for temperature and pressure ratings, dimensions, materials, and tolerances.

				Bolt Hole			Port							For Carbon Steel Fittings			For 316/316L Stainless Steel Fittings
Pipe Size	Construction	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Pipe Size	No. of	Includes	Specs. Met	For Use With	Temp.	Pressure Class	For Pipe Material		Each	For Pipe Material		Each
3/4	Seamless	4 5/8"	5/8"	11/16"	4	3 1/4"	1/2	2	Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods	—	Air, Natural Gas, Oil, Water	Not Rated	300	Carbon Steel	5291N11	0000000	316/316L Stainless Steel	5291N24	0000000
1	Seamless	4 7/8"	5/8"	11/16"	4	3 1/2"	1/2	2	Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods	ASME B16.36	Air, Natural Gas, Oil, Water	Not Rated	300	Carbon Steel	5291N12	000000	316/316L Stainless Steel	5291N25	000000
1 1/2	Seamless	6 1/8"	3/4"	13/16"	4	4 1/2"	1/2	2	Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods	ASME B16.36	Air, Natural Gas, Oil, Water	Not Rated	300	Carbon Steel	5291N13	000000	316/316L Stainless Steel	5291N26	000000
2	Seamless	6 1/2"	5/8"	11/16"	8	5"	1/2	2	Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods	ASME B16.36	Air, Natural Gas, Oil, Water	Not Rated	300	Carbon Steel	5291N14	000000	316/316L Stainless Steel	5291N27	000000
3	Seamless	8 1/4"	3/4"	13/16"	8	6 9/16"	1/2	2	Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods	ASME B16.36	Air, Natural Gas, Oil, Water	Not Rated	300	Carbon Steel	5291N15	000000	316/316L Stainless Steel	5291N28	000000
4	Seamless	10"	3/4"	13/16"	8	7 7/8"	1/2	2	Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods	ASME B16.36	Air, Natural Gas, Oil, Water	Not Rated	300	Carbon Steel	5291N16	000000	316/316L Stainless Steel	5291N29	00000000

Slip-On Weld × Flanged


Assembled	Exploded

Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides.

For 316/316L Stainless Steel Fittings—316/316L stainless steel flanges have excellent corrosion resistance.

ASME B16.36—Flanges that meet ASME B16.36 adhere to specifications and testing requirements for temperature and pressure ratings, dimensions, materials, and tolerances.

			Bolt Hole			Port							For Carbon Steel Fittings			For 316/316L Stainless Steel Fittings
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Pipe Size	No. of	Includes	Specs. Met	For Use With	Temp.	Pressure Class	For Pipe Material		Each	For Pipe Material		Each
3/4	4 5/8"	5/8"	11/16"	4	3 1/4"	1/2	2	Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods	—	Air, Natural Gas, Oil, Water	Not Rated	300	Carbon Steel	5291N17	0000000	316/316L Stainless Steel	5291N31	0000000
1	4 7/8"	5/8"	11/16"	4	3 1/2"	1/2	2	Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods	ASME B16.36	Air, Natural Gas, Oil, Water	Not Rated	300	Carbon Steel	5291N18	000000	316/316L Stainless Steel	5291N32	000000
1 1/2	6 1/8"	3/4"	13/16"	4	4 1/2"	1/2	2	Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods	ASME B16.36	Air, Natural Gas, Oil, Water	Not Rated	300	Carbon Steel	5291N19	000000	316/316L Stainless Steel	5291N33	000000
2	6 1/2"	5/8"	11/16"	8	5"	1/2	2	Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods	ASME B16.36	Air, Natural Gas, Oil, Water	Not Rated	300	Carbon Steel	5291N21	000000	316/316L Stainless Steel	5291N34	000000
3	8 1/4"	3/4"	13/16"	8	6 9/16"	1/2	2	Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods	ASME B16.36	Air, Natural Gas, Oil, Water	Not Rated	300	Carbon Steel	5291N22	000000	316/316L Stainless Steel	5291N35	00000000
4	10"	3/4"	13/16"	8	7 7/8"	1/2	2	Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods	ASME B16.36	Air, Natural Gas, Oil, Water	Not Rated	300	Carbon Steel	5291N23	000000	316/316L Stainless Steel	5291N36	00000000

Flange-Mount Orifice Valves

Also known as orifice plates, these mount between orifice flange unions. They are used to throttle, vent, bleed, or regulate the flow of liquids and gases.

304 Stainless Steel Body

					For Orifice Flange					Handle
Orifice Dia.	Water Flow	Airflow @ Pressure	For Flange Pipe Size	For Pipe Schedule	ANSI Class	Surface	Lg.	Thk.	OD	Ht.	Wd.	For Use With	Max. Pressure @ Temp.	Temp. Range, ° F		Each



	0.412"	6.13 gpm @ 40 psi	44 scfm @ 40 psi	3/4	40	300	Raised	7 5/8"	1/8"	2 5/8"	5"	1 1/2"	Air, Argon, Carbon Dioxide, Helium, Neon, Nitrogen, Oil, Water, Xenon	740 psi @ 100° F	-20 to 950	2206N12	0000000


	0.525"	9.9 gpm @ 40 psi	71.2 scfm @ 40 psi	1	40	300	Raised	7 7/8"	1/8"	2 7/8"	5"	1 1/2"	Air, Argon, Carbon Dioxide, Helium, Neon, Nitrogen, Oil, Water, Xenon	740 psi @ 100° F	-20 to 950	2206N13	000000
	0.805"	23.2 gpm @ 40 psi	167 scfm @ 40 psi	1 1/2	40	300	Raised	8 3/4"	1/8"	3 3/4"	5"	1 1/2"	Air, Argon, Carbon Dioxide, Helium, Neon, Nitrogen, Oil, Water, Xenon	740 psi @ 100° F	-20 to 950	2206N14	000000
	1.034"	38.11 gpm @ 40 psi	274.7 scfm @ 40 psi	2	40	300	Raised	9 3/8"	1/8"	4 3/8"	5"	1 1/2"	Air, Argon, Carbon Dioxide, Helium, Neon, Nitrogen, Oil, Water, Xenon	740 psi @ 100° F	-20 to 950	2206N15	000000
	1.534"	83.56 gpm @ 40 psi	602.8 scfm @ 40 psi	3	40	300	Raised	10 7/8"	1/8"	5 7/8"	5"	1 1/2"	Air, Argon, Carbon Dioxide, Helium, Neon, Nitrogen, Oil, Water, Xenon	740 psi @ 100° F	-20 to 950	2206N17	000000
	2.013"	143.75 gpm @ 40 psi	1,037.5 scfm @ 40 psi	4	40	300	Raised	12 1/8"	1/8"	7 1/8"	5"	1 1/2"	Air, Argon, Carbon Dioxide, Helium, Neon, Nitrogen, Oil, Water, Xenon	740 psi @ 100° F	-20 to 950	2206N18	000000

Pipeline Fluid Blockers

Also known as pipe blinds, these fluid blockers fit between two flanges to stop flow, so you can work downstream without draining the system.

Paddle Blinds

Paddle blinds slip between the flanges to temporarily block flow.

304 Stainless Steel and PTFE-Coated 304 Stainless Steel—304 stainless steel blinds resist corrosion better than steel blinds.

						Handle
	For Pipe Size	OD	For Orifice Flange ANSI Class	Max. Pressure @ Temp.	Thk.	Lg.	Wd.	Temp. Range, ° F	Specs. Met	Food Industry Std.		Each
Steel



		1/2	1 3/4"	150	150 psi @ 70° F	1/4"	7"	1"	-20 to 100	ASTM A36	—	4730K11	000000


		3/4	2 1/8"	150	150 psi @ 70° F	1/4"	7"	1"	-20 to 100	ASTM A36	—	4730K12	00000
		1	2 1/2"	—	150 psi @ 70° F	1/4"	7"	1"	-20 to 100	ASTM A36	—	4730K22	00000
		1 1/4	2 7/8"	150	150 psi @ 70° F	1/4"	7"	1"	-20 to 100	ASTM A36	—	4730K13	00000
		1 1/2	3 1/4"	—	150 psi @ 70° F	1/4"	7"	1"	-20 to 100	ASTM A36	—	4730K24	00000
		2	4"	—	150 psi @ 70° F	1/4"	7"	1"	-20 to 100	ASTM A36	—	4730K25	00000
		2 1/2	4 3/4"	—	150 psi @ 70° F	1/4"	7"	1"	-20 to 100	ASTM A36	—	4730K26	00000
		3	5 1/4"	—	150 psi @ 70° F	1/4"	7"	1"	-20 to 100	ASTM A36	—	4730K27	00000
		3 1/2	6 1/4"	150	150 psi @ 70° F	3/8"	7"	1"	-20 to 100	ASTM A36	—	4730K14	000000
		4	6 3/4"	—	150 psi @ 70° F	1/4"	7"	1"	-20 to 100	ASTM A36	—	4730K28	00000
		6	8 5/8"	—	150 psi @ 70° F	1/2"	7"	1"	-20 to 100	ASTM A36	—	4730K29	000000


		8	10 7/8"	—	150 psi @ 70° F	5/8"	7"	1"	-20 to 100	ASTM A36	—	4730K52	000000
		10	13 1/4"	—	150 psi @ 70° F	5/8"	7"	1 1/2"	-20 to 100	ASTM A36	—	4730K53	000000
		12	16"	—	150 psi @ 70° F	3/4"	7"	1 1/2"	-20 to 100	ASTM A36	—	4730K54	000000


		304 Stainless Steel



				8	11"	150	150 psi @ 70° F	1/4"	7"	1"	-100 to 400	—	—	4739K11	000000


				10	13 3/8"	150	150 psi @ 70° F	3/8"	7"	1 1/2"	-100 to 400	—	—	4739K12	000000
				12	16 1/8"	150	150 psi @ 70° F	3/8"	7"	1 1/2"	-100 to 400	—	—	4739K13	000000


				PTFE-Coated 304 Stainless Steel



						1/2	1 7/8"	150	150 psi @ 250° F	1/8"	2"	3/4"	-100 to 400	ASTM D4894	FDA Compliant 21 CFR 177.1550	4739K28	00000


						3/4	2 1/4"	150	150 psi @ 250° F	1/8"	2"	3/4"	-100 to 400	ASTM D4894	FDA Compliant 21 CFR 177.1550	4739K29	00000
						1	2 5/8"	150	150 psi @ 70° F	1/8"	2 3/4"	3/4"	-100 to 400	ASTM D4894	FDA Compliant 21 CFR 177.1550	4739K21	00000
						1 1/2	3 3/8"	150	150 psi @ 70° F	1/8"	2 3/4"	3/4"	-100 to 400	ASTM D4894	FDA Compliant 21 CFR 177.1550	4739K22	00000
						2	4 1/8"	150	150 psi @ 70° F	1/8"	3"	3/4"	-100 to 400	ASTM D4894	FDA Compliant 21 CFR 177.1550	4739K23	00000
						3	5 3/8"	150	150 psi @ 70° F	3/16"	3"	3/4"	-100 to 400	ASTM D4894	FDA Compliant 21 CFR 177.1550	4739K24	00000
						4	6 7/8"	150	150 psi @ 70° F	3/16"	3"	3/4"	-100 to 400	ASTM D4894	FDA Compliant 21 CFR 177.1550	4739K25	000000
						6	8 3/4"	150	150 psi @ 70° F	1/4"	5"	3/4"	-100 to 400	ASTM D4894	FDA Compliant 21 CFR 177.1550	4739K26	000000

Spectacle Blinds

Spectacle blinds install permanently and rotate around the bolt to either block or open flow. However, they add extra weight to your pipeline.

304 Stainless Steel—304 stainless steel blinds resist corrosion better than steel blinds.

	ID	OD	For Orifice Flange ANSI Class	Max. Pressure @ Temp.	Thk.	End-to-End Lg.	Temp. Range, ° F	Specs. Met		Each
Steel



	1/2	5/8"	1 3/4"	150	285 psi @ 70° F	1/4"	4 1/8"	-20 to 800	ASTM A516	4730K31	000000


	3/4	7/8"	2 1/8"	150	285 psi @ 70° F	1/4"	4 7/8"	-20 to 800	ASTM A516	4730K32	000000
	1	1"	2 1/2"	150	285 psi @ 70° F	1/4"	5 5/8"	-20 to 800	ASTM A516	4730K33	000000
	1 1/2	1 7/8"	3 1/4"	150	285 psi @ 70° F	3/8"	7 1/8"	-20 to 800	ASTM A516	4730K34	000000
	2	2 3/8"	4"	150	285 psi @ 70° F	3/8"	8 3/4"	-20 to 800	ASTM A516	4730K35	000000
	2 1/2	2 7/8"	4 3/4"	150	285 psi @ 70° F	3/8"	10 1/4"	-20 to 800	ASTM A516	4730K36	000000
	3	3 1/2"	5 1/4"	150	285 psi @ 70° F	3/8"	11 1/4"	-20 to 800	ASTM A516	4730K37	000000
	4	4 1/2"	6 3/4"	150	285 psi @ 70° F	1/2"	14 1/4"	-20 to 800	ASTM A516	4730K38	000000
	6	6 5/8"	8 5/8"	150	285 psi @ 70° F	5/8"	18 1/8"	-20 to 800	ASTM A516	4730K39	000000
	8	8 5/8"	10 7/8"	150	285 psi @ 70° F	5/8"	22 5/8"	-20 to 800	ASTM A516	4730K41	000000
	10	10 3/4"	13 1/4"	150	285 psi @ 70° F	3/4"	27 1/2"	-20 to 800	ASTM A105	4730K42	000000


	304 Stainless Steel



			1/2	5/8"	1 3/4"	150	230 psi @ 70° F	1/4"	4 1/8"	-20 to 800	ASTM A240	4739K31	000000


			3/4	7/8"	2 1/8"	150	230 psi @ 70° F	1/4"	4 7/8"	-20 to 800	ASTM A240	4739K32	000000
			1	1"	2 1/2"	150	230 psi @ 70° F	1/4"	5 5/8"	-20 to 800	ASTM A240	4739K33	000000
			1 1/2	1 7/8"	3 1/4"	150	230 psi @ 70° F	3/8"	7 1/8"	-20 to 800	ASTM A240	4739K34	000000
			2	2 3/8"	4"	150	230 psi @ 70° F	3/8"	8 3/4"	-20 to 800	ASTM A240	4739K35	000000
			2 1/2	2 7/8"	4 3/4"	150	230 psi @ 70° F	3/8"	10 1/4"	-20 to 800	ASTM A240	4739K36	000000
			3	3 1/2"	5 1/4"	150	230 psi @ 70° F	3/8"	11 1/4"	-20 to 800	ASTM A240	4739K37	000000
			4	4 1/2"	6 3/4"	150	230 psi @ 70° F	1/2"	14 1/4"	-20 to 800	ASTM A240	4739K38	000000
			6	6 5/8"	8 5/8"	150	230 psi @ 70° F	5/8"	18 1/8"	-20 to 800	ASTM A240	4739K39	000000
			8	8 5/8"	10 7/8"	150	230 psi @ 70° F	5/8"	22 5/8"	-20 to 800	ASTM A240	4739K41	000000
			10	10 3/4"	13 1/4"	150	230 psi @ 70° F	3/4"	27 1/2"	-20 to 800	ASTM A182	4739K42	00000000