McMaster-Carr

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	Pipe Size Pipe Size

	Type Type


Flange	Adapter

Cap

	Material Material

Stainless Steel

Steel

	Connection Style Connection Style

Flanged

Slip-On Weld

Butt Weld

	Flanged Connection Surface Flanged Connection Surface

	Raised

	For Pipe Material For Pipe Material

Steel

	Flange OD Flange OD	Show

165mm

	Flange OD Flange OD	Hide

	Specifications Met Specifications Met

	DN Flange Size DN Flange Size

	Bolt Circle Diameter Bolt Circle Diameter

125mm

	For Use With For Use With

	Number of Bolt Holes Number of Bolt Holes

	Maximum Pressure Maximum Pressure

230 psi @ 72° F

	Maximum Steam Pressure Maximum Steam Pressure

125 psi @ 300° F

145 psi @ 300° F

180 psi @ 300° F

	Bolt Hole Diameter Bolt Hole Diameter

18mm

	For Bolt Diameter For Bolt Diameter

16mm

	Shape Shape

	Straight
	Cap/Plug

	Fabrication Fabrication

Forged

	For Pipe Schedule For Pipe Schedule

	40

	Connection Type Connection Type

	Pipe

	Gender Gender

Female

	Construction Construction

Seamless

Welded

	Wall Thickness Wall Thickness

2.9mm

3.912mm

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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.

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. Cap flanges are also known as blind flanges.

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

Metric Butt-Weld Flanges—Forged

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Specifications Met: DIN EN 1092-1
Fittings: Use schedule 40 stainless steel
Pipe Nipples and Pipe: Use Schedule 40 stainless steel

					Bolt Hole
Pipe Size	DN Flange Size	Construction	Flange OD, mm	For Bolt Dia., mm	Dia., mm	No. of	Bolt Circle Dia., mm	Max. Pressure	Max. Steam Pressure		Each
304/304L Stainless Steel
2	50	Seamless	165	16	18	4	125	230 psi @ 72° F	125 psi @ 300° F	0000000	0000000
316/316L Stainless Steel
2	50	Seamless	165	16	18	4	125	230 psi @ 72° F	145 psi @ 300° F	0000000	000000

Metric Slip-On Weld Flanges—Forged

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Specifications Met: DIN EN 1092-1

				Bolt Hole
Pipe Size	DN Flange Size	Flange OD, mm	For Bolt Dia., mm	Dia., mm	No. of	Bolt Circle Dia., mm	Max. Pressure	Max. Steam Pressure		Each
304/304L Stainless Steel
2	50	165	16	18	4	125	230 psi @ 72° F	125 psi @ 300° F	0000000	0000000
316/316L Stainless Steel
2	50	165	16	18	4	125	230 psi @ 72° F	145 psi @ 300° F	0000000	000000

Metric Caps—Forged

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Specifications Met: DIN EN 1092-1
Fittings: Use schedule 40 stainless steel
Pipe Nipples and Pipe: Use Schedule 40 stainless steel

				Bolt Hole
Pipe Size	DN Flange Size	Flange OD, mm	For Bolt Dia., mm	Dia., mm	No. of	Bolt Circle Dia., mm	Max. Pressure	Max. Steam Pressure		Each
304/304L Stainless Steel
2	50	165	16	18	4	125	230 psi @ 72° F	125 psi @ 300° F	0000000	0000000
316/316L Stainless Steel
2	50	165	16	18	4	125	230 psi @ 72° F	145 psi @ 300° F	0000000	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.

Cap flanges are also known as blind flanges.

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

Metric Butt-Weld Flanges

Front

Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Specifications Met: DIN 2633, DIN 86030, DIN EN 1092-1, DIN 2527
Pipe Nipples and Pipe: Use Schedule 40 steel
Fittings: Use Schedule 40 iron or steel

					Bolt Hole
Pipe Size	DN Flange Size	Wall Thick., mm	Flange OD, mm	For Bolt Dia., mm	Dia.	No. of	Bolt Circle Dia., mm	Construction	Max. Pressure	Max. Steam Pressure		Each
2	50	3.912	165	16	18	4	125	Welded	230 psi @ 72° F	180 psi @ 300° F	0000000	000000

Metric Slip-On Weld Flanges

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Specifications Met: DIN 2633, DIN 86030, DIN EN 1092-1, DIN 2527
Pipe Nipples and Pipe: Use Schedule 40 steel
Fittings: Use Schedule 40 iron or steel

				Bolt Hole
Pipe Size	DN Flange Size	Flange OD, mm	For Bolt Dia., mm	Dia.	No. of	Bolt Circle Dia., mm	Max. Pressure	Max. Steam Pressure		Each
2	50	165	16	18	4	125	230 psi @ 72° F	180 psi @ 300° F	0000000	000000

Metric Caps

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Specifications Met: DIN 2633, DIN 86030, DIN EN 1092-1, DIN 2527
Pipe Nipples and Pipe: Use Schedule 40 steel
Fittings: Use Schedule 40 iron or steel

				Bolt Hole
Pipe Size	DN Flange Size	Flange OD, mm	For Bolt Dia., mm	Dia.	No. of	Bolt Circle Dia., mm	Max. Pressure	Max. Steam Pressure		Each
2	50	165	16	18	4	125	230 psi @ 72° F	180 psi @ 300° F	0000000	000000

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