Stub End Connectors | McMaster-Carr

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	Pipe Size Pipe Size

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

	Type Type


Adapter	Flange

	Flanged Connection Surface Flanged Connection Surface

	Flat

	Material Material

Stainless Steel

Steel

	Connection Style Connection Style	Show

Stub End

	Connection Style Connection Style	Hide

	Pressure Class Pressure Class

150

300

600

	For Pipe Schedule For Pipe Schedule


40	80

	For Pipe Material For Pipe Material

Stainless Steel

Steel

	Flange OD Flange OD

	Number of Bolt Holes Number of Bolt Holes

	For Use With For Use With

	Bolt Circle Diameter Bolt Circle Diameter

	Specifications Met Specifications Met

ASME

ASTM

MSS

	Shape Shape

	Straight

	Bolt Hole Diameter Bolt Hole Diameter

	For Bolt Diameter For Bolt Diameter

	Connection Type Connection Type

	Pipe

	Maximum Pressure Maximum Pressure

	Certification Certification

Material Certificate with
Traceable Lot Number and
Test Report

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

REACH Compliant

	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

	Fabrication Fabrication

Forged

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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.

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.

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

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		Standard-Wall Straight Adapters
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure		Each		Each		Each
304/304L Stainless Steel
1/2	3 1/2"	1/2"	5/8"	4	2 3/8"	230 psi @ 72° F	000000000	000000	000000000	000000	000000000	000000
3/4	3 7/8"	1/2"	5/8"	4	2 3/4"	230 psi @ 72° F	000000000	00000	000000000	00000	000000000	00000
1	4 1/4"	1/2"	5/8"	4	3 1/8"	230 psi @ 72° F	000000000	00000	000000000	00000	000000000	00000
1 1/4	4 5/8"	1/2"	5/8"	4	3 1/2"	230 psi @ 72° F	000000000	00000	000000000	00000	000000000	00000
1 1/2	5"	1/2"	5/8"	4	3 7/8"	230 psi @ 72° F	000000000	00000	000000000	00000	000000000	00000
2	6"	5/8"	3/4"	4	4 3/4"	230 psi @ 72° F	000000000	00000	000000000	00000	000000000	00000
2 1/2	7"	5/8"	3/4"	4	5 1/2"	230 psi @ 72° F	000000000	000000	000000000	00000	000000000	00000
3	7 1/2"	5/8"	3/4"	4	6"	230 psi @ 72° F	000000000	000000	000000000	00000	000000000	00000
4	9"	5/8"	3/4"	8	7 1/2"	230 psi @ 72° F	000000000	000000	000000000	00000	000000000	00000
6	11"	3/4"	7/8"	8	9 1/2"	230 psi @ 72° F	000000000	000000	000000000	000000	000000000	000000
8	13 1/2"	3/4"	7/8"	8	11 3/4"	230 psi @ 72° F	000000000	000000	000000000	000000	000000000	000000
10	16"	7/8"	1"	12	14 1/4"	230 psi @ 72° F	000000000	000000	000000000	000000	000000	00
12	19"	7/8"	1"	12	17"	230 psi @ 72° F	000000000	000000	000000000	000000	000000	00
316/316L Stainless Steel
1/2	3 1/2"	1/2"	5/8"	4	2 3/8"	230 psi @ 72° F	000000000	00000	000000000	00000	000000000	00000
3/4	3 7/8"	1/2"	5/8"	4	2 3/4"	230 psi @ 72° F	000000000	00000	000000000	00000	000000000	00000
1	4 1/4"	1/2"	5/8"	4	3 1/8"	230 psi @ 72° F	000000000	00000	000000000	00000	000000000	00000
1 1/4	4 5/8"	1/2"	5/8"	4	3 1/2"	230 psi @ 72° F	000000000	00000	000000000	00000	000000000	00000
1 1/2	5"	1/2"	5/8"	4	3 7/8"	230 psi @ 72° F	000000000	00000	000000000	00000	000000000	00000
2	6"	5/8"	3/4"	4	4 3/4"	230 psi @ 72° F	000000000	000000	000000000	00000	000000000	00000
2 1/2	7"	5/8"	3/4"	4	5 1/2"	230 psi @ 72° F	000000000	000000	000000000	00000	000000000	00000
3	7 1/2"	5/8"	3/4"	4	6"	230 psi @ 72° F	000000000	000000	000000000	00000	000000000	00000
4	9"	5/8"	3/4"	8	7 1/2"	230 psi @ 72° F	000000000	000000	000000000	00000	000000000	00000
6	11"	3/4"	7/8"	8	9 1/2"	230 psi @ 72° F	000000000	000000	000000000	000000	000000000	000000
8	13 1/2"	3/4"	7/8"	8	11 3/4"	230 psi @ 72° F	000000000	000000	000000000	000000	000000000	000000
10	16"	7/8"	1"	12	14 1/4"	230 psi @ 72° F	000000000	000000	000000000	000000	000000	00
12	19"	7/8"	1"	12	17"	230 psi @ 72° F	000000000	000000	000000000	000000	000000	00

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.

Stub-End Flanges

Flange with Straight Adapter (Front)

Flat 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
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.		Each
304/304L Stainless Steel
Pressure Class 300
1/2	08	600 psi @ 72° F	300 psi @ 360° F	3 3/4"	1/2"	0.625"	4	2 5/8"	00000000	000000
3/4	12	600 psi @ 72° F	300 psi @ 360° F	4 5/8"	5/8"	0.75"	4	3 1/4"	00000000	00000
1	16	600 psi @ 72° F	300 psi @ 360° F	4 7/8"	5/8"	0.75"	4	3 1/2"	00000000	00000
1 1/4	20	600 psi @ 72° F	300 psi @ 360° F	5 1/4"	5/8"	0.75"	4	3 7/8"	00000000	000000
1 1/2	24	600 psi @ 72° F	300 psi @ 360° F	6 1/8"	3/4"	0.875"	4	4 1/2"	00000000	000000
2	32	600 psi @ 72° F	300 psi @ 360° F	6 1/2"	5/8"	0.75"	8	5"	00000000	000000
2 1/2	40	600 psi @ 72° F	300 psi @ 360° F	7 1/2"	3/4"	0.875"	8	5 7/8"	00000000	000000
3	48	600 psi @ 72° F	300 psi @ 360° F	8 1/4"	3/4"	0.875"	8	6 5/8"	00000000	000000
4	64	600 psi @ 72° F	300 psi @ 360° F	10"	3/4"	0.875"	8	7 7/8"	00000000	000000
6	96	600 psi @ 72° F	300 psi @ 360° F	12 1/2"	3/4"	0.875"	12	10 5/8"	00000000	000000
8	__	600 psi @ 72° F	300 psi @ 360° F	15"	7/8"	1"	12	13"	0000000	000000
Pressure Class 600
1/2	08	1,200 psi @ 72° F	840 psi @ 400° F	3 3/4"	1/2"	0.62"	4	2 5/8"	0000000	00000
3/4	12	1,200 psi @ 72° F	840 psi @ 400° F	4 5/8"	5/8"	0.75"	4	3 1/4"	0000000	00000
1	16	1,200 psi @ 72° F	840 psi @ 400° F	4 7/8"	5/8"	0.75"	4	3 1/2"	0000000	000000
1 1/4	20	1,200 psi @ 72° F	840 psi @ 400° F	5 1/4"	5/8"	0.75"	4	3 7/8"	0000000	000000
1 1/2	24	1,200 psi @ 72° F	840 psi @ 400° F	6 1/8"	3/4"	0.875"	4	4 1/2"	0000000	000000
2	32	1,200 psi @ 72° F	840 psi @ 400° F	6 1/2"	5/8"	0.75"	8	5"	0000000	000000
2 1/2	40	1,200 psi @ 72° F	840 psi @ 400° F	7 1/2"	3/4"	0.88"	8	5 7/8"	0000000	000000
3	48	1,200 psi @ 72° F	840 psi @ 400° F	8 1/4"	3/4"	0.88"	8	6 5/8"	0000000	000000
4	64	1,200 psi @ 72° F	840 psi @ 400° F	10 3/4"	7/8"	1"	8	8 1/2"	0000000	000000
316/316L Stainless Steel
Pressure Class 300
1/2	08	600 psi @ 72° F	300 psi @ 360° F	3 3/4"	1/2"	0.625"	4	2 5/8"	00000000	00000
3/4	12	600 psi @ 72° F	300 psi @ 360° F	4 5/8"	5/8"	0.75"	4	3 1/4"	00000000	00000
1	16	600 psi @ 72° F	300 psi @ 360° F	4 7/8"	5/8"	0.75"	4	3 1/2"	00000000	00000
1 1/4	20	600 psi @ 72° F	300 psi @ 360° F	5 1/4"	5/8"	0.75"	4	3 7/8"	00000000	000000
1 1/2	24	600 psi @ 72° F	300 psi @ 360° F	6 1/8"	3/4"	0.875"	4	4 1/2"	00000000	000000
2	32	600 psi @ 72° F	300 psi @ 360° F	6 1/2"	5/8"	0.75"	8	5"	00000000	000000
2 1/2	40	600 psi @ 72° F	300 psi @ 360° F	7 1/2"	3/4"	0.875"	8	5 7/8"	00000000	000000
3	48	600 psi @ 72° F	300 psi @ 360° F	8 1/4"	3/4"	0.875"	8	6 5/8"	00000000	000000
4	64	600 psi @ 72° F	300 psi @ 360° F	10"	3/4"	0.875"	8	7 7/8"	00000000	000000
6	96	600 psi @ 72° F	300 psi @ 360° F	12 1/2"	3/4"	0.875"	12	10 5/8"	00000000	000000
8	__	600 psi @ 72° F	300 psi @ 360° F	15"	7/8"	1"	12	13"	00000000	000000
Pressure Class 600
1/2	08	1,200 psi @ 72° F	840 psi @ 400° F	3 3/4"	1/2"	0.62"	4	2 5/8"	0000000	00000
3/4	12	1,200 psi @ 72° F	840 psi @ 400° F	4 5/8"	5/8"	0.75"	4	3 1/4"	0000000	000000
1	16	1,200 psi @ 72° F	840 psi @ 400° F	4 7/8"	5/8"	0.75"	4	3 1/2"	0000000	000000
1 1/4	20	1,200 psi @ 72° F	840 psi @ 400° F	5 1/4"	5/8"	0.75"	4	3 7/8"	0000000	000000
1 1/2	24	1,200 psi @ 72° F	840 psi @ 400° F	6 1/8"	3/4"	0.875"	4	4 1/2"	0000000	000000
2	32	1,200 psi @ 72° F	840 psi @ 400° F	6 1/2"	5/8"	0.75"	8	5"	0000000	000000
2 1/2	40	1,200 psi @ 72° F	840 psi @ 400° F	7 1/2"	3/4"	0.88"	8	5 7/8"	0000000	000000
3	48	1,200 psi @ 72° F	840 psi @ 400° F	8 1/4"	3/4"	0.88"	8	6 5/8"	0000000	000000
4	64	1,200 psi @ 72° F	840 psi @ 400° F	10 3/4"	7/8"	1"	8	8 1/2"	0000000	000000

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.

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

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	Dash Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
Pressure Class 300
1/2	08	3 3/4"	1/2"	5/8"	4	2 5/8"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	000000
3/4	12	4 5/8"	5/8"	3/4"	4	3 1/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	00000
1	16	4 7/8"	5/8"	3/4"	4	3 1/2"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	00000
1 1/4	20	5 1/4"	5/8"	3/4"	4	3 7/8"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	00000
1 1/2	24	6 1/8"	3/4"	7/8"	4	4 1/2"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	00000
2	32	6 1/2"	5/8"	3/4"	8	5"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	00000
2 1/2	40	7 1/2"	3/4"	7/8"	8	5 7/8"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	00000
3	48	8 1/4"	3/4"	7/8"	8	6 5/8"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	00000
4	64	10"	3/4"	7/8"	8	7 7/8"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	000000
5	__	11"	3/4"	7/8"	8	9 1/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	000000
6	96	12 1/2"	3/4"	7/8"	12	10 5/8"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	000000
8	__	15"	7/8"	1"	12	13"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	000000
10	__	17 1/2"	1.12"	1.12"	16	15 1/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	000000
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	000000
Pressure Class 600
1	16	4.88"	3/4"	3/4"	4	3 1/2"	1,400 psi @ 72° F	1,300 psi @ 300° F	Black-Coated Steel	00000000	00000
1 1/2	24	6.12"	0.88"	0.88"	4	4 1/2"	1,400 psi @ 72° F	1,300 psi @ 300° F	Black-Coated Steel	00000000	00000
2	32	6 1/2"	3/4"	3/4"	8	5"	1,400 psi @ 72° F	1,300 psi @ 300° F	Black-Coated Steel	00000000	00000
3	48	8 1/4"	0.88"	0.88"	8	6.62"	1,400 psi @ 72° F	1,300 psi @ 300° F	Black-Coated Steel	00000000	00000
4	64	10 3/4"	1"	1"	8	8 1/2"	1,400 psi @ 72° F	1,300 psi @ 300° F	Black-Coated Steel	00000000	000000
6	96	14"	1.12"	1.12"	12	11 1/2"	1,400 psi @ 72° F	1,300 psi @ 300° F	Black-Coated Steel	00000000	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.

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.

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

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

Flanges
			Bolt Hole							Straight Adapters
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure		Each		Each
1/2	3 1/2"	1/2"	5/8"	4	2 3/8"	285 psi @ 72° F	150 psi @ 300° F	000000000	000000	000000000	000000
3/4	3 7/8"	1/2"	5/8"	4	2 3/4"	285 psi @ 72° F	150 psi @ 300° F	000000000	00000	000000000	00000
1	4 1/4"	1/2"	5/8"	4	3 1/8"	285 psi @ 72° F	150 psi @ 300° F	000000000	00000	000000000	00000
1 1/4	4 5/8"	1/2"	5/8"	4	3 1/2"	285 psi @ 72° F	150 psi @ 300° F	000000000	00000	000000000	00000
1 1/2	5"	1/2"	5/8"	4	3 7/8"	285 psi @ 72° F	150 psi @ 300° F	000000000	00000	000000000	00000
2	6"	5/8"	3/4"	4	4 3/4"	285 psi @ 72° F	150 psi @ 300° F	000000000	00000	000000000	00000
2 1/2	7"	5/8"	3/4"	4	5 1/2"	285 psi @ 72° F	150 psi @ 300° F	000000000	00000	000000000	000000
3	7 1/2"	5/8"	3/4"	4	6"	285 psi @ 72° F	150 psi @ 300° F	000000000	00000	000000000	000000
4	9"	5/8"	3/4"	8	7 1/2"	285 psi @ 72° F	150 psi @ 300° F	000000000	00000	000000000	000000
5	10"	3/4"	7/8"	8	8 1/2"	285 psi @ 72° F	150 psi @ 300° F	000000000	00000	000000	00
6	11"	3/4"	7/8"	8	9 1/2"	285 psi @ 72° F	150 psi @ 300° F	000000000	00000	000000000	000000
8	13 1/2"	3/4"	7/8"	8	11 3/4"	285 psi @ 72° F	150 psi @ 300° F	000000000	000000	000000000	000000
10	16"	7/8"	1"	12	14 1/4"	285 psi @ 72° F	150 psi @ 300° F	00000000	000000	000000	00
12	19"	7/8"	1"	12	17"	285 psi @ 72° F	150 psi @ 300° F	00000000	000000	000000	00