12 Caps | McMaster-Carr

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	Pipe Size Pipe Size	Show

	Pipe Size Pipe Size	Hide

1/16
1/8
1/4
3/8
1/2
5/8
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
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8
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12

	Type Type


Cap	Flange

	Material Material

Plastic

Stainless Steel

Steel

	Schedule Schedule


10	40

80

	For Pipe Schedule For Pipe Schedule


40	80

10

	For Pipe Material For Pipe Material

Stainless Steel

Steel

Plastic

	Connection Style Connection Style

Socket Connect

Butt Weld

Flanged

	Shape Shape

	Cap/Plug

	Pressure Class Pressure Class

150

300

	Specifications Met Specifications Met

	For Use With For Use With

	System of Measurement System of Measurement

Inch

	Length Length

7 1/8"

9 5/8"

	Connection Type Connection Type

	Pipe

	ID ID

12.388"

	OD OD

12 3/4"

	Wall Thickness Wall Thickness

0.18"

	Flange OD Flange OD

19"

20 1/2"

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

RoHS Compliant

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

DFARS Specialty Metals
COTS-Exempt

	Number of Bolt Holes Number of Bolt Holes

	Color Color

	Dark Gray
	Light Gray
	White

	Flanged Connection Surface Flanged Connection Surface

	Raised

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

REACH Compliant

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9 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.

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. Cap flanges are also known as blind flanges.

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

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
12	19"	7/8"	1"	12	17"	230 psi @ 72° F	000000000	0000000	000000000	0000000

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.

Caps

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

			304/304L Stainless Steel		316/316L Stainless Steel
Pipe Size	Wall Thick.	Construction		Each		Each
12	0.18"	Welded	000000000	0000000	000000000	0000000

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.

Cap flanges are also known as blind flanges.

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

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
12	19"	7/8"	1"	12	17"	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.

Cap flanges are also known as blind flanges.

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

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
12	20 1/2"	1 1/4"	1 1/4"	16	17 3/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	0000000

Standard-Wall Plastic Pipe Fittings for Water

Connect these fittings to Schedule 40 plastic pipe–they are the industry standard for residential and commercial low-pressure plumbing and water supply applications. They are plastic for good corrosion resistance.

Fittings for drinking water meet NSF/ANSI Standard 61.

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

Fittings that meet ASTM D1784, ASTM D1785, and ASTM D4066 adhere to specifications and testing requirements for material quality.

Note: For fittings that are not rated for pressure, you can use the pressure rating of the plastic pipe as a reference. Threaded fittings are limited to 50% of the rated pressure of the pipe.

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

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

Caps, Female Socket Connect

For Use With: Drinking Water, Water
Maximum Temperature: 140° F
Specifications Met: ASTM D1784, NSF/ANSI 61
Pipe Nipples and Pipe: Use Schedule 40 PVC Plastic
Flanges: See table

			For Flange
Pipe Size	Socket Depth	Material	Schedule	Material		Each
White
12	6"	PVC Plastic	40	PVC Plastic	00000000	0000000

Thick-Wall Plastic Pipe Fittings for Water

Connect these fittings to Schedule 80 pipe–they have thicker, stronger walls than standard-wall fittings so they can handle heavy duty industrial plumbing and water supply applications, such as water processing, waste water treatment, and irrigation. Fittings are plastic for good corrosion resistance. They meet ASTM specifications and testing requirements for material quality.

Fittings for drinking water meet NSF/ANSI Standard 61.

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

Note: For fittings that are not rated for pressure, you can use the pressure rating of the plastic pipe as a reference. Threaded fittings are limited to 50% of the rated pressure of the pipe.

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

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

Caps, Female Socket Connect

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

Pipe Size	Socket Depth	Material	Color		Each
12	6"	PVC Plastic	Dark Gray	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 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
12	19"	7/8"	1"	12	17"	PVC Plastic	Light Gray	00000000	0000000