8 1/2" OD Flanges | McMaster-Carr

Clear All

	Pipe Size Pipe Size

3 1/2

	Type Type


Flange	Adapter

Cap	Stub End

	Connection Style Connection Style

	Material Material

Stainless Steel

Steel

	For Pipe Schedule For Pipe Schedule

XXH

160

Any

	System of Measurement System of Measurement

Inch

	Flange OD Flange OD	Show

8 1/2"

	Flange OD Flange OD	Hide

	For Pipe Material For Pipe Material

Stainless Steel

Steel

	For Use With For Use With

	Bolt Circle Diameter Bolt Circle Diameter

6 1/2"

	Number of Bolt Holes Number of Bolt Holes

	Flanged Connection Surface Flanged Connection Surface

	Raised

	Shape Shape

	Straight
	Cap/Plug

	Schedule Schedule


10	40

	Pressure Class Pressure Class

150

1500

	Connection Type Connection Type

	Pipe

	Maximum Pressure Maximum Pressure

285 psi @ 72° F

3,700 psi @ 72° F

	Specifications Met Specifications Met

ASME

ASTM

MSS

	Thread Type Thread Type

NPT

	Bolt Hole Diameter Bolt Hole Diameter

3/4"

	Maximum Steam Pressure Maximum Steam Pressure

230 psi @ 300° F

3,200 psi @ 300° F

	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

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

RoHS Compliant

View catalog pages (7)

Forward

How can we improve?

14 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.

Standard-Wall Butt-Weld Stainless Steel Unthreaded Pipe Fittings

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

304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.

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.

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

Stub-End Straight Adapters

Straight Adapter with Flange

Straight Adapter

For Use With: Air, Natural Gas, Oil, Water
Specifications Met: ASME B16.9, ASTM A403, MSS SP-43
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Flanges: Use Class 150 stainless steel

Fittings					Flanges
Pipe Size	Wall Thick.	Construction		Each		Each
304/304L Stainless Steel
6	0.28"	Welded	000000000	0000000	000000000	0000000
316/316L Stainless Steel
6	0.28"	Welded	000000000	000000	000000000	000000

Thin-Wall Butt-Weld Stainless Steel Unthreaded Pipe Fittings

Also known as Schedule 10 fittings, 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 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.

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

Stub-End Straight Adapters

Straight Adapter with Flange

Straight Adapter

For Use With: Air, Natural Gas, Oil, Water
Specifications Met: ASME B16.9, ASTM A403, MSS SP-43
Pipe: Use Schedule 10 stainless steel

Straight Adapters						Flanges
Pipe Size	Wall Thick.	Flange OD	Construction		Each		Each
304/304L Stainless Steel
6	0.134"	8 1/2"	Welded	000000000	0000000	000000000	0000000
316/316L Stainless Steel
6	0.134"	8 1/2"	Welded	000000000	000000	000000000	000000

Low-Pressure 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.

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

Flanges

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: 150
Specifications Met:
NPT: ASME B16.5, ASTM A105, MSS SP-25
BSPT: ASTM A105
Pipe Nipples and Pipe: Use Schedule 40 steel
Fittings: Use Class 125 or 150 iron and steel

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
NPT
3 1/2	8 1/2"	5/8"	3/4"	8	7"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	0000000

High-Pressure Steel Threaded Pipe Flanges

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: 1500
Specifications Met:
1/2 to 2 Pipe Sizes: ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6
All other sizes: ASTM A105
Pipe Nipples and Pipe: Use Schedule 160 or XXH steel
Fittings: Use Class 3000 or 6000 iron and steel

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.

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

				Bolt Hole
Pipe Size	Dash Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
NPT
2	32	8 1/2"	7/8"	1"	8	6 1/2"	3,700 psi @ 72° F	3,200 psi @ 300° F	Black-Coated Steel	0000000	0000000

Standard-Wall Butt-Weld Steel Unthreaded Pipe Fittings

Butt-weld fittings 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. Fittings are also known as Schedule 40. They are for use in noncorrosive environments.

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

Stub-End Straight Adapters

Straight Adapter with Flange

Straight Adapter

For Use With: Air, Steam, Oil, Water, Natural Gas
Specifications Met: ASTM A234, ASME B16.9
Pipe Nipples and Pipe: Use Schedule 40 steel
Flanges: Use Class 150 steel

Straight Adapters					Flanges
Pipe Size	Wall Thick.	Construction		Each		Each
6	0.28"	Seamless	000000000	0000000	000000000	000000

Extreme-Pressure 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.

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

Socket-connect flanges have an internal stop that supports the pipe when welding and prevents the pipe from sliding all the way through.

Cap flanges are also known as blind flanges.

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

Butt-Weld Flanges

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class : 1500
Specifications Met: MSS SP-6, MSS SP-25, ASTM A105, ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Fittings: Use Class 6000 steel

					Bolt Hole
Pipe Size	Dash Size	Wall Thick.	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	For Pipe Schedule		Each
2	32	0.218"	8 1/2"	7/8"	1"	8	6 1/2"	3,700 psi @ 72° F	3,200 psi @ 300° F	80	0000000	0000000

Slip-On Weld Flanges

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class : 1500
Specifications Met: See table
Certification: Material Certificate with Traceable Lot Number and Test Report
Fittings: Use Class 6000 steel

				Bolt Hole
Pipe Size	Dash Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	For Pipe Schedule	Specifications Met		Each
2	32	8 1/2"	7/8"	1"	8	6 1/2"	3,700 psi @ 72° F	3,200 psi @ 300° F	Any	ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6	0000000	0000000

Socket-Connect Flanges

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class : 1500
Specifications Met:
3 and 4 Pipe Sizes: ASTM A105
All other sizes: ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6
Certification: Material Certificate with Traceable Lot Number and Test Report
Fittings: Use Class 6000 steel

				Bolt Hole
Pipe Size	Dash Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	For Pipe Schedule		Each
2	32	8 1/2"	7/8"	1"	8	6 1/2"	3,700 psi @ 72° F	3,200 psi @ 300° F	80	0000000	0000000

Caps

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class : 1500
Specifications Met: MSS SP-6, MSS SP-25, ASTM A105, ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Fittings: Use Class 6000 steel

				Bolt Hole
Pipe Size	Dash Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	For Pipe Schedule		Each
2	32	8 1/2"	7/8"	1"	8	6 1/2"	3,700 psi @ 72° F	3,200 psi @ 300° F	Any	0000000	0000000