McMaster-Carr

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	Pipe Size Pipe Size

3 1/2

	Type Type


Flange	Adapter

Cap

	Material Material

Steel

	Connection Style Connection Style

	Class Class

1500

	Flanged Connection Surface Flanged Connection Surface

	Raised

	For Pipe Material For Pipe Material

Steel

	Flange OD Flange OD	Show

8 1/2"

	Flange OD Flange OD	Hide

	Bolt Circle Diameter Bolt Circle Diameter

6 1/2"

	Maximum Pressure Maximum Pressure

285 psi @ 72° F

3,700 psi @ 72° F

	For Use With For Use With

	Thread Type Thread Type

NPT

	Dash Size Dash Size

	For Pipe Schedule For Pipe Schedule


40	160

XXH

	Bolt Hole Diameter Bolt Hole Diameter

3/4"

	Specifications Met Specifications Met

ANSI/ASME

ASTM

MSS

	Fabrication Fabrication

Forged

	Maximum Steam Pressure Maximum Steam Pressure

230 psi @ 300° F

3,200 psi @ 300° F

	Number of Bolt Holes Number of Bolt Holes

	For Bolt Diameter For Bolt Diameter

5/8"

7/8"

	Connection Type Connection Type

	Pipe

	Gender Gender

Female

	Shape Shape

	Straight
	Cap/Plug

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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 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
Specifications Met:
NPT: ANSI/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
Class: 1500
Specifications Met:
1/2 to 2 Pipe Sizes: ANSI/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 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

Extreme-Pressure Steel Unthreaded Pipe Flanges

For excellent strength in extreme-pressure applications, choose these heavy duty 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
Class: 1500
Specifications Met: MSS SP-6, MSS SP-25, ASTM A105, ANSI/ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Fittings: Use Class 6000 steel
Pipe Nipples and Pipe: Use Schedule XXH 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		Each
2	32	0.436"	8 1/2"	7/8"	1"	8	6 1/2"	3,700 psi @ 72° F	3,200 psi @ 300° F	0000000	0000000

Slip-On Weld Flanges

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Class: 1500
Specifications Met: See table
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule XXH steel
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	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	ANSI/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
Class: 1500
Specifications Met:
3 and 4 Pipe Sizes: ASTM A105
All other sizes: ANSI/ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule XXH steel
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		Each
2	32	8 1/2"	7/8"	1"	8	6 1/2"	3,700 psi @ 72° F	3,200 psi @ 300° F	0000000	0000000

Caps

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Class: 1500
Specifications Met: MSS SP-6, MSS SP-25, ASTM A105, ANSI/ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule XXH steel
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		Each
2	32	8 1/2"	7/8"	1"	8	6 1/2"	3,700 psi @ 72° F	3,200 psi @ 300° F	0000000	0000000

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