Iron and Steel Raised-Face Pipe Flanges

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	Pipe Size Pipe Size

1/4
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

Reducing Adapter	Cap

	Connection Style Connection Style

	Material Material

Steel

	Pressure Class Pressure Class

	System of Measurement System of Measurement

Inch

Metric

	Flange OD Flange OD

	Number of Bolt Holes Number of Bolt Holes

	For Pipe Schedule For Pipe Schedule


40	80

160	XXH

	For Pipe Material For Pipe Material

Steel

	For Use With For Use With

	Bolt Circle Diameter Bolt Circle Diameter

	Thread Type Thread Type

NPT

BSPT

	Specifications Met Specifications Met

	Maximum Steam Pressure Maximum Steam Pressure

	For Bolt Diameter For Bolt Diameter

	Shape Shape

	Straight
	Cap/Plug

	Bolt Hole Diameter Bolt Hole Diameter

	Maximum Pressure Maximum Pressure

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

DFARS Specialty Metals
COTS-Exempt

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

REACH Compliant

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

RoHS Compliant

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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 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
1/2	0.109"	3 1/2"	1/2"	5/8"	4	2 3/8"	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	000000000	000000
3/4	0.113"	3 7/8"	1/2"	5/8"	4	2 3/4"	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	000000000	00000
1	0.133"	4 1/4"	1/2"	5/8"	4	3 1/8"	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	000000000	00000
1	0.144"	4 59/64"	5/8"	0.748"	4	3 35/64"	__	Seamless	Not Rated	Not Rated	__	ASTM A105, JIS B 2220	0000000	00000
1 1/4	0.14"	4 5/8"	1/2"	5/8"	4	3 1/2"	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	000000000	00000
1 1/2	0.137"	5 33/64"	5/8"	3/4"	4	4 9/64"	__	Seamless	Not Rated	Not Rated	__	ASTM A105, JIS B 2220	0000000	000000
1 1/2	0.145"	5"	1/2"	5/8"	4	3 7/8"	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	000000000	00000
2	0.154"	6"	5/8"	3/4"	4	4 3/4"	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	000000000	00000
2	0.157"	6 7/64"	5/8"	3/4"	4	4 23/32"	__	Seamless	Not Rated	Not Rated	__	ASTM A105, JIS B 2220	0000000	000000
2 1/2	0.203"	7"	5/8"	3/4"	4	5 1/2"	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	000000000	00000
3	0.216"	7 1/2"	5/8"	3/4"	4	6"	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	000000000	00000
4	0.237"	9"	5/8"	3/4"	8	7 1/2"	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	000000000	00000
5	0.258"	10"	3/4"	7/8"	8	8 1/2"	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	000000000	00000
6	0.28"	11"	3/4"	7/8"	8	9 1/2"	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	000000000	000000
8	0.322"	13 1/2"	3/4"	7/8"	8	11 3/4"	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	000000000	000000
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	000000
12	0.406"	19"	7/8"	1"	12	17"	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	000000

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
1	25	3.378	115	12	14	4	85	Welded	230 psi @ 72° F	180 psi @ 300° F	0000000	000000
2	50	3.912	165	16	18	4	125	Welded	230 psi @ 72° F	180 psi @ 300° F	0000000	00000
3	80	5.486	200	16	18	8	160	Welded	230 psi @ 72° F	180 psi @ 300° F	0000000	00000
4	100	6.02	220	16	18	8	180	Welded	230 psi @ 72° F	180 psi @ 300° F	0000000	00000

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
1/2	3 1/2"	1/2"	5/8"	4	2 3/8"	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	000000000	000000
3/4	3 7/8"	1/2"	5/8"	4	2 3/4"	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	000000000	00000
1	4 1/4"	1/2"	5/8"	4	3 1/8"	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	000000000	00000
1	4 59/64"	5/8"	0.748"	4	3 35/64"	__	Not Rated	Not Rated	__	ASTM A105, JIS B 2220	0000000	00000
1 1/4	4 5/8"	1/2"	5/8"	4	3 1/2"	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	000000000	00000
1 1/2	5"	1/2"	5/8"	4	3 7/8"	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	000000000	00000
1 1/2	5 33/64"	5/8"	0.748"	4	4 9/64"	__	Not Rated	Not Rated	__	ASTM A105, JIS B 2220	0000000	00000
2	6"	5/8"	3/4"	4	4 3/4"	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	000000000	00000
2	6 7/64"	5/8"	0.748"	4	4 23/32"	__	Not Rated	Not Rated	__	ASTM A105, JIS B 2220	0000000	00000
2 1/2	7"	5/8"	3/4"	4	5 1/2"	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	000000000	00000
3	7 1/2"	5/8"	3/4"	4	6"	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	000000000	00000
4	9"	5/8"	3/4"	8	7 1/2"	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	000000000	00000
5	10"	3/4"	7/8"	8	8 1/2"	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	000000000	00000
6	11"	3/4"	7/8"	8	9 1/2"	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	000000000	00000
8	13 1/2"	3/4"	7/8"	8	11 3/4"	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	000000000	000000
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	000000
12	19"	7/8"	1"	12	17"	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	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
1	25	115	12	14	4	85	230 psi @ 72° F	180 psi @ 300° F	0000000	000000
2	50	165	16	18	4	125	230 psi @ 72° F	180 psi @ 300° F	0000000	00000
3	80	200	16	18	8	160	230 psi @ 72° F	180 psi @ 300° F	0000000	00000
4	100	220	16	18	8	180	230 psi @ 72° F	180 psi @ 300° F	0000000	00000

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
1/2	3 1/2"	1/2"	5/8"	4	2 3/8"	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	000000
3/4	3 7/8"	1/2"	5/8"	4	2 3/4"	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
1	4 1/4"	1/2"	5/8"	4	3 1/8"	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
1 1/4	4 5/8"	1/2"	5/8"	4	3 1/2"	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
1 1/2	5"	1/2"	5/8"	4	3 7/8"	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
2	6"	5/8"	3/4"	4	4 3/4"	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
2 1/2	7"	5/8"	3/4"	4	5 1/2"	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
3	7 1/2"	5/8"	3/4"	4	6"	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
4	9"	5/8"	3/4"	8	7 1/2"	285 psi @ 72° F	150 psi @ 300° F	ASTM A105, MSS SP-25	000000000	00000
5	10"	3/4"	7/8"	8	8 1/2"	285 psi @ 72° F	150 psi @ 300° F	ASTM A105, MSS SP-25	000000000	00000
6	11"	3/4"	7/8"	8	9 1/2"	285 psi @ 72° F	150 psi @ 300° F	ASTM A105, MSS SP-25	000000000	00000
8	13 1/2"	3/4"	7/8"	8	11 3/4"	285 psi @ 72° F	150 psi @ 300° F	ASTM A105, MSS SP-25	000000000	000000
10	16"	7/8"	1"	12	14 1/4"	285 psi @ 72° F	Not Rated	ASTM A105	00000000	000000
12	19"	7/8"	1"	12	17"	285 psi @ 72° F	Not Rated	ASTM A105	00000000	000000

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
1/2	3 1/2"	1/2"	5/8"	4	2 3/8"	150	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	000000
3/4	3 7/8"	1/2"	5/8"	4	2 3/4"	150	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
1	4 1/4"	1/2"	5/8"	4	3 1/8"	150	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
1	4 59/64"	5/8"	0.748"	4	3 35/64"	__	Not Rated	Not Rated	ASTM A105, JIS B 2220	0000000	00000
1 1/4	4 5/8"	1/2"	5/8"	4	3 1/2"	150	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
1 1/2	5"	1/2"	5/8"	4	3 7/8"	150	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
1 1/2	5 33/64"	5/8"	0.748"	4	4 9/64"	__	Not Rated	Not Rated	ASTM A105, JIS B 2220	0000000	00000
2	6"	5/8"	3/4"	4	4 3/4"	150	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
2	6 7/64"	5/8"	0.748"	4	4 23/32"	__	Not Rated	Not Rated	ASTM A105, JIS B 2220	0000000	00000
2 1/2	7"	5/8"	3/4"	4	5 1/2"	150	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
3	7 1/2"	5/8"	3/4"	4	6"	150	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
4	9"	5/8"	3/4"	8	7 1/2"	150	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
5	10"	3/4"	7/8"	8	8 1/2"	150	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
6	11"	3/4"	7/8"	8	9 1/2"	150	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	00000
8	13 1/2"	3/4"	7/8"	8	11 3/4"	150	285 psi @ 72° F	150 psi @ 300° F	ASME B16.5, ASTM A105, MSS SP-25	000000000	000000
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	000000
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	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
1	25	115	12	14	4	85	230 psi @ 72° F	180 psi @ 300° F	0000000	000000
2	50	165	16	18	4	125	230 psi @ 72° F	180 psi @ 300° F	0000000	00000
3	80	200	16	18	8	160	230 psi @ 72° F	180 psi @ 300° F	0000000	00000
4	100	220	16	18	8	180	230 psi @ 72° F	180 psi @ 300° F	0000000	00000

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.

Reducing flanges allow you to transition your system to a smaller pipe size; attach to a flange with a larger pipe size but with the same flange dimensions.

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
Pressure Class: 150
Specifications Met:
NPT: 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
1/2	3 1/2"	1/2"	5/8"	4	2 3/8"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	000000
3/4	3 7/8"	1/2"	5/8"	4	2 3/4"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	00000
1	4 1/4"	1/2"	5/8"	4	3 1/8"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	00000
1 1/4	4 5/8"	1/2"	5/8"	4	3 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	00000
1 1/2	5"	1/2"	5/8"	4	3 7/8"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	00000
2	6"	5/8"	3/4"	4	4 3/4"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	00000
2 1/2	7"	5/8"	3/4"	4	5 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	00000
3	7 1/2"	5/8"	3/4"	4	6"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	00000
3 1/2	8 1/2"	5/8"	3/4"	8	7"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	000000
4	9"	5/8"	3/4"	8	7 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	00000
5	10"	3/4"	7/8"	8	8 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	00000
6	11"	3/4"	7/8"	8	9 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	00000
8	13 1/2"	3/4"	7/8"	8	11 3/4"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	000000
BSPT
1/2	3 1/2"	5/8"	5/8"	4	2 3/8"	285 psi @ 72° F	230 psi @ 300° F	Black-Coated Steel	0000000	00000
3/4	3 7/8"	5/8"	5/8"	4	2 3/4"	285 psi @ 72° F	230 psi @ 300° F	Black-Coated Steel	0000000	00000
1	4 1/4"	5/8"	5/8"	4	3 1/8"	285 psi @ 72° F	230 psi @ 300° F	Black-Coated Steel	0000000	00000
1 1/4	4 5/8"	5/8"	5/8"	4	3 1/2"	285 psi @ 72° F	230 psi @ 300° F	Black-Coated Steel	0000000	00000
1 1/2	5"	5/8"	0.62"	4	3 7/8"	285 psi @ 72° F	230 psi @ 300° F	Black-Coated Steel	0000000	00000
2	6"	3/4"	3/4"	4	4 3/4"	285 psi @ 72° F	230 psi @ 300° F	Black-Coated Steel	0000000	00000
2 1/2	7"	3/4"	3/4"	4	5 1/2"	285 psi @ 72° F	230 psi @ 300° F	Black-Coated Steel	0000000	000000
3	7 1/2"	3/4"	3/4"	4	6"	285 psi @ 72° F	230 psi @ 300° F	Black-Coated Steel	0000000	00000
4	9"	3/4"	3/4"	8	7 1/2"	285 psi @ 72° F	230 psi @ 300° F	Black-Coated Steel	0000000	000000
6	11"	7/8"	7/8"	8	9 1/2"	285 psi @ 72° F	230 psi @ 300° F	Black-Coated Steel	0000000	000000

Reducing Flanges

Front

Raised Surface on Back

For Use With:
1/4 Pipe Size: Air, Natural Gas, Oil, Water
All other sizes: Air, Natural Gas, Oil, Steam, Water
Specifications Met:
1/4 Pipe Size: ASTM A105
All other sizes: ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6
Fittings: Use Class 125 or 150 iron and steel
Pipe Nipples and Pipe: Use Schedule 40 Steel

				Bolt Hole
Pipe Size	For Flange Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
NPT
1/4	1	4 1/4"	5/8"	0.62"	4	3.12"	Not Rated	__	Steel	0000000	000000
1/2	3/4	3 7/8"	5/8"	5/8"	4	2 3/4"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	00000
1/2	1	4 1/4"	5/8"	0.62"	4	3.12"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	00000
1/2	1 1/2	5"	5/8"	5/8"	4	3.88"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	00000
1/2	2	6"	3/4"	3/4"	4	4 3/4"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
1/2	3	7 1/2"	3/4"	3/4"	4	6"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
1/2	4	9"	3/4"	3/4"	8	7 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
3/4	1	4 1/4"	5/8"	0.62"	4	3.12"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	00000
3/4	1 1/2	5"	5/8"	5/8"	4	3.88"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	00000
3/4	2	6"	3/4"	3/4"	4	4 3/4"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
3/4	3	7 1/2"	3/4"	3/4"	4	6"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
3/4	4	9"	3/4"	3/4"	8	7 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
1	1 1/4	4 5/8"	5/8"	0.62"	4	3 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
1	1 1/2	5"	5/8"	0.62"	4	3.88"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	00000
1	2	6"	3/4"	3/4"	4	4 3/4"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
1	2 1/2	7"	3/4"	3/4"	4	5 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
1	3	7 1/2"	3/4"	3/4"	4	6"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
1	4	9"	3/4"	3/4"	8	7 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
1 1/4	1 1/2	5"	5/8"	0.62"	4	3.88"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	00000
1 1/4	2	6"	3/4"	3/4"	4	4 3/4"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
1 1/4	3	7 1/2"	3/4"	3/4"	4	6"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
1 1/4	4	9"	3/4"	3/4"	8	7 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
1 1/2	2	6"	3/4"	3/4"	4	4 3/4"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
1 1/2	2 1/2	7"	3/4"	3/4"	4	5 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
1 1/2	3	7 1/2"	3/4"	3/4"	4	6"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
1 1/2	4	9"	3/4"	3/4"	8	7 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
2	2 1/2	7"	3/4"	3/4"	4	5 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
2	3	7 1/2"	3/4"	3/4"	4	6"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
2	4	9"	3/4"	3/4"	8	7 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
2 1/2	3	7 1/2"	3/4"	3/4"	4	6"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
2 1/2	4	9"	3/4"	3/4"	8	7 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
3	4	9"	3/4"	3/4"	8	7 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
4	6	11"	7/8"	0.88"	8	9 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
5	6	11"	7/8"	0.88"	8	9 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000
6	8	13 1/2"	7/8"	7/8"	8	11 3/4"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	000000

Low-Pressure Galvanized Steel Threaded Pipe Flanges

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: 150
Specifications Met: ASTM A123, ASTM A105, ASME B16.5
Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
Fittings: Use Class 125 or 150 galvanized iron and galvanized steel

The galvanized finish on these flanges provides fair corrosion resistance. Also known as Pressure Class 150 flanges, they are for use in low-pressure applications. Bolt two same-size flanges 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.

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure		Each
NPT
1/2	3 1/2"	1/2"	5/8"	4	2 3/8"	285 psi @ 72° F	150 psi @ 300° F	00000000	000000
3/4	3 7/8"	1/2"	5/8"	4	2 3/4"	285 psi @ 72° F	150 psi @ 300° F	00000000	00000
1	4 1/4"	1/2"	5/8"	4	3 1/8"	285 psi @ 72° F	150 psi @ 300° F	00000000	00000
1 1/4	4 5/8"	1/2"	5/8"	4	3 1/2"	285 psi @ 72° F	150 psi @ 300° F	00000000	00000
1 1/2	5"	1/2"	5/8"	4	3 7/8"	285 psi @ 72° F	150 psi @ 300° F	00000000	00000
2	6"	5/8"	3/4"	4	4 3/4"	285 psi @ 72° F	150 psi @ 300° F	00000000	00000
2 1/2	7"	5/8"	3/4"	4	5 1/2"	285 psi @ 72° F	150 psi @ 300° F	00000000	00000
3	7 1/2"	5/8"	3/4"	4	6"	285 psi @ 72° F	150 psi @ 300° F	00000000	00000
4	9"	5/8"	3/4"	8	7 1/2"	285 psi @ 72° F	150 psi @ 300° F	00000000	000000
5	10"	3/4"	7/8"	8	8 1/2"	285 psi @ 72° F	150 psi @ 300° F	00000000	000000
6	11"	3/4"	7/8"	8	9 1/2"	285 psi @ 72° F	150 psi @ 300° F	00000000	000000
8	13 1/2"	3/4"	7/8"	8	11 3/4"	285 psi @ 72° F	150 psi @ 300° F	00000000	000000
BSPT
1/2	3 1/2"	5/8"	0.62"	4	2 3/8"	285 psi @ 72° F	150 psi @ 300° F	000000	00000
3/4	3 7/8"	5/8"	0.62"	4	2 3/4"	285 psi @ 72° F	150 psi @ 300° F	000000	00000
1	4 1/4"	5/8"	0.62"	4	3 1/8"	285 psi @ 72° F	150 psi @ 300° F	000000	00000
1 1/2	5"	5/8"	0.62"	4	3 7/8"	285 psi @ 72° F	150 psi @ 300° F	000000	000000
2	6"	3/4"	3/4"	4	4 3/4"	285 psi @ 72° F	150 psi @ 300° F	000000	000000

Medium-Pressure Steel Threaded Pipe Flanges

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: See table
Specifications Met: ASTM A105, ASME B16.5
Pipe Nipples and Pipe: Use Schedule 80 steel
Fittings: Use Class 300 or Schedule 80 iron and steel

With better strength than our low-pressure steel flanges, these are for use in medium-pressure applications. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line. Flanges are also known as Pressure Class 300 or Pressure Class 600 flanges. Use in noncorrosive environments.

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

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
NPT
Pressure Class 300
1/2	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	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	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	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	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	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	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	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	10"	3/4"	7/8"	8	7 7/8"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	00000
5	11"	3/4"	7/8"	8	9 1/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	000000
6	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
Pressure Class 600
1	4 7/8"	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	6 1/8"	7/8"	0.88"	4	4 1/2"	1,400 psi @ 72° F	1,300 psi @ 300° F	Black-Coated Steel	00000000	00000
2	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	8 1/4"	7/8"	0.88"	8	6.62"	1,400 psi @ 72° F	1,300 psi @ 300° F	Black-Coated Steel	00000000	000000
4	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	14"	1 1/8"	1.12"	12	11 1/2"	1,400 psi @ 72° F	1,300 psi @ 300° F	Black-Coated Steel	00000000	000000

Medium-Pressure Galvanized Steel Threaded Pipe Flanges

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Steam, Water
Pressure Class : 300
Specifications Met: ASTM A123, ASTM A105, ASME B16.5
Pipe Nipples and Pipe: Use Schedule 80 steel
Fittings: Use Class 300 iron or steel

A galvanized finish gives these flanges fair corrosion resistance. Also known as Pressure Class 300 flanges, they can withstand medium-pressure applications. Bolt two same-size flanges 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.

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure		Each
NPT
1/2	3 3/4"	5/8"	0.62"	4	2 5/8"	600 psi @ 72° F	0000000	0000000
3/4	4 5/8"	3/4"	3/4"	4	3 1/4"	600 psi @ 72° F	0000000	000000
1	4 7/8"	3/4"	3/4"	4	3 1/2"	600 psi @ 72° F	0000000	00000
1 1/4	5 1/4"	3/4"	3/4"	4	3 7/8"	600 psi @ 72° F	0000000	000000
1 1/2	6 1/8"	7/8"	0.88"	4	4 1/2"	600 psi @ 72° F	0000000	000000
2	6 1/2"	3/4"	3/4"	8	5"	600 psi @ 72° F	0000000	000000
3	8 1/4"	7/8"	0.88"	8	6 5/8"	600 psi @ 72° F	0000000	000000
4	10"	7/8"	0.88"	8	7 7/8"	600 psi @ 72° F	0000000	000000

High-Pressure Steel Threaded Pipe Flanges

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: 1500
Specifications Met:
1/2 to 2 Pipe Sizes: 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 Pressure 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
1/2	08	4 3/4"	3/4"	7/8"	4	3 1/4"	3,700 psi @ 72° F	3,200 psi @ 300° F	Black-Coated Steel	0000000	0000000
3/4	12	5 1/8"	3/4"	7/8"	4	3 1/2"	3,700 psi @ 72° F	3,200 psi @ 300° F	Black-Coated Steel	0000000	000000
1	16	5 7/8"	7/8"	1"	4	4"	3,700 psi @ 72° F	3,200 psi @ 300° F	Black-Coated Steel	0000000	000000
1 1/4	20	6 1/4"	7/8"	1"	4	4 3/8"	3,700 psi @ 72° F	3,200 psi @ 300° F	Black-Coated Steel	0000000	000000
1 1/2	24	7"	1"	1 1/8"	4	4 7/8"	3,700 psi @ 72° F	3,200 psi @ 300° F	Black-Coated Steel	0000000	000000
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	000000
3	48	10 1/2"	1 1/4"	1 1/4"	8	8"	Not Rated	Not Rated	Black-Coated Steel	0000000	000000
4	64	12 1/4"	1.38"	1.38"	8	9 1/2"	Not Rated	Not Rated	Black-Coated Steel	0000000	000000