10 Flanges | McMaster-Carr

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	Pipe Size Pipe Size	Show

	Pipe Size Pipe Size	Hide

1/8
1/4
3/8
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12

	Type Type


Flange	Adapter

Cap	Stub End

	Material Material

Plastic

Stainless Steel

Steel

	Pressure Class Pressure Class

150

300

	Connection Style Connection Style

	For Pipe Material For Pipe Material

Stainless Steel

Steel

Plastic

	Flanged Connection Surface Flanged Connection Surface


Raised	Flat

	For Pipe Schedule For Pipe Schedule


40	80

10

	System of Measurement System of Measurement

Inch

	Flange OD Flange OD

12 3/4"

16"

17 1/2"

	Number of Bolt Holes Number of Bolt Holes

	Bolt Circle Diameter Bolt Circle Diameter

14 1/4"

15 1/4"

	Specifications Met Specifications Met

	For Use With For Use With

	Maximum Steam Pressure Maximum Steam Pressure

	Shape Shape

	Straight
	Cap/Plug

	Connection Type Connection Type

	Pipe

	Bolt Hole Diameter Bolt Hole Diameter

1.12"

	For Bolt Diameter For Bolt Diameter

7/8"

1.12"

	Maximum Pressure Maximum Pressure

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

DFARS Specialty Metals
COTS-Exempt

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

RoHS Compliant

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

REACH Compliant

	Certification Certification

Material Certificate with
Traceable Lot Number and
Test Report

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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.

Low-Pressure Stainless Steel Unthreaded Pipe Flanges

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.

304 stainless steel flanges offer very good corrosion resistance, and 316 stainless steel flanges have excellent corrosion resistance.

Forged flanges have better strength than cast flanges.

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.

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. Cap flanges are also known as blind flanges.

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

Inch Butt-Weld Flanges—Forged

Front

Raised Surface on Back

For Use With: Air, Water, Oil, Natural Gas
Pressure Class: 150
Specifications Met: ASTM A182, ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Fittings: Use schedule 40 stainless steel
Pipe Nipples and Pipe: Use Schedule 40 stainless steel

				Bolt Hole				304/304L Stainless Steel		316/316L Stainless Steel
Pipe Size	Construction	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure		Each		Each
10	Seamless	16"	7/8"	1"	12	14 1/4"	230 psi @ 72° F	000000000	0000000	000000000	0000000

Inch Slip-On Weld Flanges—Forged

Front

Raised Surface on Back

For Use With: Air, Water, Oil, Natural Gas
Pressure Class: 150
Specifications Met: ASTM A182, ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Fittings: Use schedule 40 stainless steel
Pipe Nipples and Pipe: Use Schedule 40 stainless steel

			Bolt Hole				304/304L Stainless Steel		316/316L Stainless Steel
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure		Each		Each
10	16"	7/8"	1"	12	14 1/4"	230 psi @ 72° F	000000000	0000000	000000000	0000000

Stub-End Flanges—Forged

Flange with Straight Adapter (Front)

Flat Surface on Back

For Use With: Air, Water, Oil, Natural Gas
Pressure Class: 150
Specifications Met: ASTM A182, ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Fittings: Use schedule 40 stainless steel
Pipe Nipples and Pipe: Use Schedule 40 stainless steel

Flanges
			Bolt Hole						Thin-Wall Straight Adapters
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure		Each		Each
304/304L Stainless Steel
10	16"	7/8"	1"	12	14 1/4"	230 psi @ 72° F	000000000	0000000	000000000	0000000
316/316L Stainless Steel
10	16"	7/8"	1"	12	14 1/4"	230 psi @ 72° F	000000000	000000	000000000	000000

Inch Caps—Forged

Front

Raised Surface on Back

For Use With: Air, Water, Oil, Natural Gas
Pressure Class: 150
Specifications Met: ASTM A182, ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Fittings: Use schedule 40 stainless steel
Pipe Nipples and Pipe: Use Schedule 40 stainless steel

			Bolt Hole				304/304L Stainless Steel		316/316L Stainless Steel
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure		Each		Each
10	16"	7/8"	1"	12	14 1/4"	230 psi @ 72° F	000000000	0000000	000000000	0000000

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.

304 stainless steel flanges offer very good corrosion resistance. 316 stainless steel flanges have excellent corrosion resistance.

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: See table
Specifications Met:
Pressure Class 300: ASME B16.5, ASTM A182, MSS SP-25, MSS SP-6
Pressure Class 600: ASME B16.5, ASTM A182
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Fittings: Use Schedule 40 stainless steel

			Bolt Hole					304/304L Stainless Steel		316/316L Stainless Steel
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure		Each		Each
Pressure Class 300
10	17 1/2"	1"	1.12"	16	15 1/4"	600 psi @ 72° F	300 psi @ 360° F	0000000	0000000	00000000	000000000

Slip-On Weld Flanges

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: See table
Specifications Met:
Pressure Class 300: ASME B16.5, ASTM A182, MSS SP-25, MSS SP-6
Pressure Class 600: ASME B16.5, ASTM A182
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Fittings: Use Schedule 40 stainless steel

					Bolt Hole			304/304L Stainless Steel		316/316L Stainless Steel
Pipe Size	Max. Pressure	Max. Steam Pressure	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.		Each		Each
Pressure Class 300
10	600 psi @ 72° F	300 psi @ 360° F	17 1/2"	1"	1.12"	16	15 1/4"	0000000	0000000	00000000	000000000

Caps

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: See table
Specifications Met:
Pressure Class 300: ASME B16.5, ASTM A182, MSS SP-25, MSS SP-6
Pressure Class 600: ASME B16.5, ASTM A182
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Fittings: Use Schedule 40 stainless steel

					Bolt Hole			304/304L Stainless Steel		316/316L Stainless Steel
Pipe Size	Max. Pressure	Max. Steam Pressure	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.		Each		Each
Pressure Class 300
10	600 psi @ 72° F	300 psi @ 360° F	17 1/2"	1"	1.12"	16	15 1/4"	0000000	0000000	00000000	000000000

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.

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: Use Schedule 10 stainless steel

Straight Adapters						Flanges
Pipe Size	Wall Thick.	Flange OD	Construction		Each		Each
304/304L Stainless Steel
10	0.134"	12 3/4"	Welded	000000000	0000000	000000000	0000000
316/316L Stainless Steel
10	0.134"	12 3/4"	Welded	000000000	000000	000000000	000000

Low-Pressure Steel Unthreaded Pipe Flanges

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. Flanges are for use with low-pressure applications in 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.

Inch Butt-Weld Flanges

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: See table
Specifications Met: See table
Certification: See table
Pipe Nipples and Pipe: Use Schedule 40 steel
Fittings: Use Schedule 40 iron or steel

				Bolt Hole
Pipe Size	Wall Thick.	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Pressure Class	Construction	Max. Pressure	Max. Steam Pressure	Certification	Specifications Met		Each
10	0.365"	16"	7/8"	1"	12	14 1/4"	150	Seamless	285 psi @ 72° F	150 psi @ 300° F	Material Certificate with Traceable Lot Number and Test Report	ASME B16.5, ASTM A105, MSS SP-25	00000000	0000000

Inch Slip-On Weld Flanges

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: See table
Specifications Met: See table
Certification: See table
Pipe Nipples and Pipe: Use Schedule 40 steel
Fittings: Use Schedule 40 iron or steel

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Pressure Class	Max. Pressure	Max. Steam Pressure	Certification	Specifications Met		Each
10	16"	7/8"	1"	12	14 1/4"	150	285 psi @ 72° F	150 psi @ 300° F	Material Certificate with Traceable Lot Number and Test Report	ASME B16.5, ASTM A105, MSS SP-25	00000000	0000000

Socket-Connect Flanges

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: 150
Specifications Met: See table
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 40 steel
Fittings: Use Schedule 40 iron or steel

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
10	16"	7/8"	1"	12	14 1/4"	285 psi @ 72° F	Not Rated	ASTM A105	00000000	0000000

Stub-End Flanges

Flange with Straight Adapter (Front)

Flat Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: 150
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 40 steel
Fittings: Use Schedule 40 iron or steel
Specifications Met: MSS SP-25, ASTM A105, ASME B16.5

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure		Each
10	16"	7/8"	1"	12	14 1/4"	285 psi @ 72° F	150 psi @ 300° F	00000000	0000000

Inch Caps

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: See table
Specifications Met: See table
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 40 steel
Fittings: Use Schedule 40 iron or steel

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Pressure Class	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
10	16"	7/8"	1"	12	14 1/4"	150	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	00000000	0000000

High-Pressure 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.

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: See table
Specifications Met: ASTM A105, ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 80 steel
Fittings: Use Class 3000 and Schedule 80 steel

				Bolt Hole
Pipe Size	Wall Thick.	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
Pressure Class 300
10	0.594"	17 1/2"	1.12"	1.12"	16	15 1/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	0000000

Slip-On Weld Flanges

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: See table
Specifications Met: ASTM A105, ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 80 steel
Fittings: Use Class 3000 and Schedule 80 steel

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
Pressure Class 300
10	17 1/2"	1.12"	1.12"	16	15 1/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	0000000

Socket-Connect Flanges

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: See table
Specifications Met: See table
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 80 steel
Fittings: Use Class 3000 and Schedule 80 steel

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material	Specifications Met		Each
Pressure Class 300
10	17 1/2"	1.12"	1.12"	16	15 1/4"	Not Rated	Not Rated	Black-Coated Steel	ASTM A105	00000000	0000000

Stub-End Flanges

Stub-End Flange (Front)

Flat Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: See table
Specifications Met: ASTM A105, ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 80 steel
Fittings: Use Class 3000 and Schedule 80 steel

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
Pressure Class 300
10	17 1/2"	1.12"	1.12"	16	15 1/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	0000000

Caps

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: See table
Specifications Met: ASTM A105, ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 80 steel
Fittings: Use Class 3000 and Schedule 80 steel

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
Pressure Class 300
10	17 1/2"	1.12"	1.12"	16	15 1/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	0000000

Thick-Wall Plastic Pipe Flanges for Water

For Use With: Drinking Water, Water
Pressure Class: 150
Maximum Temperature: 140° F
Specifications Met: ASTM D1784, NSF/ANSI 61
Pipe Nipples and Pipe: Use Schedule 80 PVC Plastic
Fittings: Use Schedule 80 PVC Plastic

Also known as Pressure Class 150 flanges, these flanges have thick, strong walls to handle heavy duty industrial plumbing and water supply applications, such as water processing, waste water treatment, and irrigation. They meet NSF/ANSI 61 for drinking water. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line. All are PVC, which has good corrosion resistance. They meet ASTM D1784 specifications and testing requirements for material quality.

Warning: Never use plastic pipe flanges and pipe with compressed air or gas.

Sealants cannot be sold to Colorado, Connecticut, District of Columbia, Delaware, Illinois, Indiana, Massachusetts, Maryland, Maine, Michigan, New Hampshire, New Jersey, Northern Virginia, New York, Ohio, Pennsylvania, Rhode Island, or Utah due to local VOC (Volatile Organic Compounds) regulations.

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

Fixed Female Socket-Connect Flanges

Front

Back

Attach socket-connect ends to unthreaded pipe or another socket-connect fitting with a PVC primer and cement (also known as solvent weld).

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Material	Color		Each
10	16"	7/8"	1"	12	14 1/4"	PVC Plastic	Dark Gray	00000000	0000000

Los Angeles County, CA, Orange County, CA, Riverside County, CA, San Bernardino County, CA, Ventura County, CA

00000000

Each

000000

Rotating Female Socket-Connect Flanges

Front

Raised Surface on Back

Attach socket-connect ends to unthreaded pipe or another socket-connect fitting with a PVC primer and cement (also known as solvent weld).

Rotating flanges are also known as Van Stone flanges; they swivel for easy bolt hole alignment.

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Material	Color		Each
10	16"	7/8"	1"	12	14 1/4"	PVC Plastic	Dark Gray	00000000	0000000

Los Angeles County, CA, Orange County, CA, Riverside County, CA, San Bernardino County, CA, Ventura County, CA

00000000

Each

000000

Fixed Cap Flanges

Front

Back

Cap flanges are also known as blind flanges.

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No.	Bolt Circle Dia.	Material	Color		Each
10	16"	7/8"	1"	12	14 1/4"	PVC Plastic	Light Gray	00000000	0000000