6 1/8" OD Flanges | McMaster-Carr

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Compressed Non-Asbestos Synthetic Fiber

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36 Products

About Pipe and Fittings

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

High-Pressure Stainless Steel Unthreaded Pipe Flanges

Use these heavy duty forged flanges for high-pressure applications. Bolt two flat-surface flanges or two raised-surface flanges of same size together with a gasket (sold separately) to create an access point in a pipe line.

Forged Flanges

Stub End with

Straight Adapter

(Front)


Butt Weld	Slip-On	Socket-Connect

Forged flanges have better strength than cast flanges.

Butt-Weld Fitting Connection—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.

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

Stub-End Fitting Connection—Stub-end flanges are also known as lap-joint flanges. Use them with a stub-end straight adapter (not included). The stub-end straight adapter slides into the flange and welds to pipe (not the flange). Since the flange isn’t welded to the pipe, it can be disconnected easily for frequent cleaning and inspecting.

304/304L Stainless Steel—Flanges hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.

316/316L Stainless Steel—Flanges are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel flanges, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.

	Pipe Size		Dash Size					Bolt Hole						304/304L Stainless Steel		316/316L Stainless Steel
	(A)	(B)	(A)	(B)	Flanged Connection Surface (B)	Flange OD	For Bolt Dia.	Dia.	No. Of	Bolt Circle Dia.	Pressure Class	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each		Each
Butt Weld



		1 1/2	1 1/2	24	24	Raised	6 1/8"	3/4"	0.875"	4	4 1/2"	300	600 psi @ 72° F	415 psi @ 360° F	4448T291	0000000	4452T311	0000000


		1 1/2	1 1/2	24	24	Raised	6 1/8"	3/4"	0.875"	4	4 1/2"	600	1,200 psi @ 72° F	825 psi @ 400° F	1538N59	000000	1503N35	000000


		Slip-On Weld Female



				1 1/2	1 1/2	24	24	Raised	6 1/8"	3/4"	0.875"	4	4 1/2"	300	600 psi @ 72° F	300 psi @ 360° F	4448T255	000000	4452T265	000000


				1 1/2	1 1/2	24	24	Raised	6 1/8"	3/4"	0.875"	4	4 1/2"	600	1,200 psi @ 72° F	840 psi @ 400° F	1538N19	000000	———	0


				Socket-Connect Female



						1 1/2	1 1/2	24	24	Raised	6 1/8"	3/4"	0.875"	4	4 1/2"	300	600 psi @ 72° F	300 psi @ 360° F	4448T268	00000	4452T278	000000


						1 1/2	1 1/2	24	24	Raised	6 1/8"	3/4"	0.875"	4	4 1/2"	600	1,200 psi @ 72° F	840 psi @ 400° F	1538N39	000000	1503N25	000000


						Stub End



								1 1/2	1 1/2	24	24	Flat	6 1/8"	3/4"	0.875"	4	4 1/2"	300	600 psi @ 72° F	300 psi @ 360° F	4448T312	000000	4452T322	000000

Forged Blind Flanges


Front	Raised Surface on Back

Forged flanges have better strength than cast flanges.

304/304L Stainless Steel—Flanges hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.

						Bolt Hole						304/304L Stainless Steel		316/316L Stainless Steel
	Pipe Size	Dash Size	Flanged Connection Surface	Flange OD	For Bolt Dia.	Dia.	No. Of	Bolt Circle Dia.	Pressure Class	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each		Each
Flanged



		1 1/2	24	Raised	6 1/8"	3/4"	0.875"	4	4 1/2"	300	600 psi @ 72° F	300 psi @ 360° F	4448T279	0000000	4452T289	0000000


		1 1/2	24	Raised	6 1/8"	3/4"	0.875"	4	4 1/2"	600	1,200 psi @ 72° F	840 psi @ 400° F	1538N95	000000	1503N55	000000

Stub-End Straight Adapters

Straight Adapter

Stub-end straight adapters are used with flanges. Slide a flange onto the stub end and weld the stub end to pipe (not the flange). Since the flange isn’t welded to the pipe, it can be disconnected easily, which creates an access point for frequent cleaning and inspecting.

					304/304L Stainless Steel		316/316L Stainless Steel
Pipe Size	Wall Thk.	Flange OD	Construction	Pipe Schedule		Each		Each
1 1/2	0.145"	2 7/8"	Welded	40	45605K655	000000	45555K655	000000

High-Pressure Stainless Steel Threaded Pipe Flanges

Forged for high strength, these heavy duty flanges can handle high-pressure applications. They are also known as ANSI flanges. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line.

Forged Flanges


Front	Raised Surface on Back

Forged flanges have better strength than cast flanges.

304/304L Stainless Steel—Flanges hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.

	Pipe Size		Dash Size					Bolt Hole						304/304L Stainless Steel		316/316L Stainless Steel
	(A)	(B)	(A)	(B)	Flanged Connection Surface (B)	Flange OD	For Bolt Dia.	Dia.	No. Of	Bolt Circle Dia.	Pressure Class	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each		Each
NPT Female



		1 1/2	1 1/2	24	24	Raised	6 1/8"	3/4"	0.88"	4	4 1/2"	300	600 psi @ 72° F	300 psi @ 300° F	7977K15	000000	7469T35	0000000


		1 1/2	1 1/2	24	24	Raised	6 1/8"	3/4"	0.88"	4	4 1/2"	600	1,200 psi @ 72° F	840 psi @ 400° F	1441N29	000000	1501N25	000000

High-Pressure Iron and Steel Unthreaded Pipe Flanges

Forged for extra strength, these heavy duty flanges can withstand high-pressure applications. Bolt two flat-surface flanges or two raised-surface flanges of the same size together with a gasket (sold separately) to create an access point in a pipe line.

Forged Flanges


Butt Weld (Front)	Butt Weld (Raised Surface on Back)	Slip-On Weld (Front)	Slip-On Weld (Raised Surface on Back)

Socket Connect (Front)	Socket-Connect (Raised Surface on Back)	Stub-End (Front)	Stub-End (Flat Surface on Back)

Forged flanges have better strength than cast flanges.

Butt-Weld Fitting Connection—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.

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

	Pipe Size		Dash Size					Bolt Hole
	(A)	(B)	(A)	(B)	Flanged Connection Surface (B)	Flange OD	For Bolt Dia.	Dia.	No. Of	Bolt Circle Dia.	Pressure Class	Material	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
Butt Weld



		1 1/2	1 1/2	24	24	Raised	6 1/8"	3/4"	7/8"	4	4 1/2"	300	Steel	600 psi @ 72° F	300 psi @ 300° F	6806K311	000000


		Slip-On Weld Female



				1 1/2	1 1/2	24	24	Raised	6 1/8"	3/4"	7/8"	4	4 1/2"	300	Steel	600 psi @ 72° F	300 psi @ 300° F	6806K281	00000


				Socket-Connect Female



						1 1/2	1 1/2	24	24	Raised	6 1/8"	3/4"	7/8"	4	4 1/2"	300	Steel	600 psi @ 72° F	300 psi @ 300° F	6806K291	00000


						Stub-End Female



								1 1/2	1 1/2	24	24	Flat	6 1/8"	3/4"	7/8"	4	4 1/2"	300	Steel	600 psi @ 72° F	300 psi @ 300° F	6806K331	00000

Forged Blind Flanges


Front	Raised Surface on Back

Forged flanges have better strength than cast flanges.

						Bolt Hole
	Pipe Size	Dash Size	Flanged Connection Surface	Flange OD	For Bolt Dia.	Dia.	No. Of	Bolt Circle Dia.	Pressure Class	Material	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
Flanged



		1 1/2	24	Raised	6 1/8"	3/4"	7/8"	4	4 1/2"	300	Steel	600 psi @ 72° F	300 psi @ 300° F	6806K321	000000

Stub-End Straight Adapters

Straight Adapter

Pipe Size	Flange OD	Construction	Pipe Schedule	Finished Material		Each
1 1/2	2 7/8"	Seamless	80	Steel	4981T251	0000000

High-Pressure Iron and Steel Threaded Pipe Flanges

With better strength than our low-pressure steel flanges, these are for use in high-pressure applications. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line. Flanges are also known as Pressure Class 300 or Pressure Class 600 flanges. Use in noncorrosive environments.

Flanges


Front	Raised Surface on Back

	Pipe Size					Bolt Hole
	(A)	(B)	Flanged Connection Surface (B)	Flange OD	For Bolt Dia.	Dia.	No. Of	Bolt Circle Dia.	Pressure Class	Material	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPT Female



		1 1/2	1 1/2	Raised	6 1/8"	3/4"	7/8"	4	4 1/2"	300	Steel	600 psi @ 72° F	300 psi @ 300° F	6806K124	000000


		1 1/2	1 1/2	Raised	6 1/8"	7/8"	0.88"	4	4 1/2"	600	Steel	1,400 psi @ 72° F	1,300 psi @ 300° F	6806K423	00000

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
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	0000000	316/316L Stainless Steel	5291N26	0000000

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.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

			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
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	0000000	316/316L Stainless Steel	5291N33	0000000

High-Pressure Galvanized Iron and Steel Threaded Pipe Flanges

A galvanized finish gives these flanges fair corrosion resistance. Also known as Pressure Class 300 flanges, they can withstand medium-pressure applications. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Flanges


Front	Raised Surface on Back

	Pipe Size					Bolt Hole
	(A)	(B)	Flanged Connection Surface (B)	Flange OD	For Bolt Dia.	Dia.	No. Of	Bolt Circle Dia.	Pressure Class	Material	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPT Female



		1 1/2	1 1/2	Raised	6 1/8"	7/8"	0.88"	4	4 1/2"	300	Galvanized Steel	600 psi @ 72° F	Not Rated	1733N15	000000