8 1/2" OD Flanges | McMaster-Carr

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17 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.

Standard-Wall Butt-Weld Stainless Steel Unthreaded Pipe Stub Ends


Straight Pipe Stub End with Pipe Flange	Straight Adapter

Also known as Schedule 40 pipe stub ends, these have thicker walls than our thin-wall stainless steel unthreaded butt-weld pipe stub ends. They have beveled ends that, when flush to pipe, create a trough for a strong weld that permits maximum flow.

Pipe stub ends 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—304/304L stainless steel pipe stub ends have very good corrosion resistance.

316/316L Stainless Steel—316/316L stainless steel pipe stub ends have excellent corrosion resistance.

	Pipe Stub Ends												Flanges
							For Pipe		For Flange
	Pipe Size	Wall Thk.	Flange OD	Construction	For Use With	Specs. Met	Schedule	Material	Class	Material		Each		Each
Straight Pipe Stub Ends, Butt Weld × Flanged







				304/304L Stainless Steel

				6	0.28"	8 1/2"	Welded	Air, Natural Gas, Oil, Water	ASME B16.9, ASTM A403, MSS SP-43	40	304 Stainless Steel, 304/304L Stainless Steel	150	304 Stainless Steel, 304/304L Stainless Steel	45605K665	0000000	44685K161	0000000




						316/316L Stainless Steel

						6	0.28"	8 1/2"	Welded	Air, Natural Gas, Oil, Water	ASME B16.9, ASTM A403, MSS SP-43	40	316 Stainless Steel, 316/316L Stainless Steel	150	316 Stainless Steel, 316/316L Stainless Steel	45555K665	000000	44695K151	000000

Low-Pressure Iron and Steel Threaded Pipe Flanges

Use these flanges for low-pressure applications in noncorrosive environments. Bolt two flanges of the same size 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.

	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



		3 1/2	3 1/2	Raised	8 1/2"	5/8"	3/4"	8	7"	150	Steel	285 psi @ 72° F	230 psi @ 300° F	68095K444	0000000

Thin-Wall Butt-Weld Stainless Steel Unthreaded Pipe Stub Ends


Straight Pipe Stub End with Pipe Flange	Straight Adapter

Also known as Schedule 10 pipe stub ends, these are thin and lightweight. They have beveled ends that, when flush to pipe, create a trough for a strong weld that permits maximum flow.

304/304L Stainless Steel—304/304L stainless steel pipe stub ends have very good corrosion resistance.

316/316L Stainless Steel—316/316L stainless steel pipe stub ends have excellent corrosion resistance.

	Pipe Stub Ends												Flanges
							For Pipe		For Flange
	Pipe Size	Wall Thk.	Flange OD	Construction	For Use With	Specs. Met	Schedule	Material	Class	Material		Each		Each
Straight Pipe Stub Ends, Butt Weld × Flanged







				304/304L Stainless Steel

				6	0.134"	8 1/2"	Welded	Air, Natural Gas, Oil, Water	ASME B16.9, ASTM A403, MSS SP-43	10	304 Stainless Steel, 304/304L Stainless Steel	150	304 Stainless Steel, 304/304L Stainless Steel	45735K312	0000000	44685K161	0000000




						316/316L Stainless Steel

						6	0.134"	8 1/2"	Welded	Air, Natural Gas, Oil, Water	ASME B16.9, ASTM A403, MSS SP-43	10	316 Stainless Steel, 316/316L Stainless Steel	150	316 Stainless Steel, 316/316L Stainless Steel	43645K154	000000	44695K151	000000

Extreme-Pressure Iron and Steel Threaded Pipe Flanges

Also known as Pressure Class 1500 flanges, these have the strength to handle high pressures. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line. Flanges are for use in noncorrosive environments.

Forged Flanges


Front	Raised Surface on Back

Forged flanges have better strength than cast flanges.

	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
NPT Female



		2	2	32	32	Raised	8 1/2"	7/8"	1"	8	6 1/2"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1153T46	0000000

FM-Approved Low-Pressure Iron and Steel Unthreaded Pipe Flanges

FM-approved for fire protection applications, these flanges are cast iron, so they're brittle and can be quickly opened by hitting them with a sledge hammer. Bolt them together with a gasket (not included) to create an access point within a low-pressure pipe line. All are cap flanges, which are also known as blind flanges. Use them in noncorrosive environments.

Cast Blind Flanges


Front	Back

Cast flanges are also called MSS flanges.

					Bolt Hole
	Pipe 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.	Certification		Each
Flanged



		3 1/2	Flat	8 1/2"	5/8"	3/4"	8	7"	125	Cast Iron	200 psi @ 72° F	165 psi @ 300° F	FM Approved	4824N16	0000000

Extreme-Pressure Iron and Steel Unthreaded Pipe Flanges

For excellent strength in extreme-pressure applications, choose these heavy duty Pressure Class 1500 flanges. Bolt two same-size flanges together with a gasket (sold separately) to create an access point in a pipe line. They are for noncorrosive environments.

Forged Flanges


Butt Weld: Front	Butt Weld: Raised Surface on Back	Slip-On Weld Female: Front

Slip-On Weld Female: Raised Surface on Back	Socket-Connect Female: Front	Socket-Connect Female: Raised 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



		2	2	32	32	Raised	8 1/2"	7/8"	1"	8	6 1/2"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T44	0000000


		Slip-On Weld Female



				2	2	32	32	Raised	8 1/2"	7/8"	1"	8	6 1/2"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T51	000000


				Socket-Connect Female



						2	2	32	32	Raised	8 1/2"	7/8"	1"	8	6 1/2"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T64	000000

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



		2	32	Raised	8 1/2"	7/8"	1"	8	6 1/2"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T57	0000000

Standard-Wall Butt-Weld Steel Unthreaded Pipe Stub Ends


Straight Pipe Stub End with Pipe Flange	Straight Adapter

Butt-weld pipe stub ends allow for a smooth connection that provides maximum flow. They have beveled ends that, when flush to pipe, create a trough for a strong, permanent weld. Pipe stub ends are also known as Schedule 40. They are for use in noncorrosive environments.

	Pipe Stub Ends												Flanges
							For Pipe		For Flange
	Pipe Size	Wall Thk.	Flange OD	Construction	For Use With	Specs. Met	Schedule	Material	Class	Material		Each		Each
Straight Pipe Stub Ends, Butt Weld × Flanged







				Steel

				6	0.28"	8 1/2"	Seamless	Air, Natural Gas, Oil, Steam, Water	ASME B16.9, ASTM A234	40	Steel	150	Steel	43425K235	0000000	68095K394	000000

Thick-Wall Butt-Weld Steel Unthreaded Pipe Stub Ends


Straight Pipe Stub End with Pipe Flange	Straight Adapter

With thicker, stronger walls than our standard-wall butt-weld pipe stub ends, these stand up to your high strength applications. Weld them flush against pipe for a smooth connection that permits maximum flow. These stub ends have beveled ends that create a trough for a leak-resistant, permanent weld. Made of steel, they’re for use in noncorrosive environments.

	Pipe Stub Ends												Flanges
							For Pipe		For Flange
	Pipe Size	Wall Thk.	Flange OD	Construction	For Use With	Specs. Met	Schedule	Material	Class	Material		Each		Each
Straight Pipe Stub Ends, Butt Weld × Flanged







				Steel

				6	0.432"	8 1/2"	Seamless	Air, Natural Gas, Oil, Steam, Water	ASTM A234	80	Steel	300	Steel	4981T321	0000000	6806K336	0000000