Iron and Steel Slip-On Pipe Flanges

	Connection Style Connection Style

Flanged

Slip-On Weld

	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

	Class Class

	For Pipe Schedule For Pipe Schedule

Any

	Number of Bolt Holes Number of Bolt Holes

	Flange OD Flange OD

	For Use With For Use With

	Maximum Steam Pressure Maximum Steam Pressure

	Specifications Met Specifications Met

	Bolt Circle Diameter Bolt Circle Diameter

	For Bolt Diameter For Bolt Diameter

	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

	DN Flange Size DN Flange Size

100

	Dash Size Dash Size

View catalog pages (3)

Forward

How can we improve?

49 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 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.

Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides.

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

Inch Slip-On Weld Flanges

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
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.	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 10K 25A, 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 10K 40A, 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 10K 50A, 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

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.

Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides.

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

Slip-On Weld Flanges

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
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
300 Class
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	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	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
600 Class
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

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.

Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides.

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

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
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	For Pipe Schedule	Specifications Met		Each
1/2	08	4 3/4"	3/4"	7/8"	4	3 1/4"	3,700 psi @ 72° F	3,200 psi @ 300° F	Any	ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6	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	Any	ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6	0000000	000000
1	16	5 7/8"	7/8"	1"	4	4"	3,700 psi @ 72° F	3,200 psi @ 300° F	Any	ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6	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	Any	ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6	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	Any	ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6	0000000	000000
2	32	8 1/2"	7/8"	1"	8	6 1/2"	3,700 psi @ 72° F	3,200 psi @ 300° F	Any	ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6	0000000	000000
3	48	10 1/2"	1 1/4"	1 1/4"	8	8"	Not Rated	Not Rated	Any	ASTM A105	0000000	000000
4	64	12 1/4"	1.38"	1.38"	8	9 1/2"	Not Rated	Not Rated	Any	ASTM A105	0000000	000000