Low-Pressure Black Iron and Steel Threaded Flanges

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34 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

FM-Approved Low-Pressure Cast Iron Threaded Pipe Flanges

Suitable for use in fire-protection applications, these flanges are brittle and can be quickly opened with the strike of a sledge hammer. Bolt two flanges of the same size together with a gasket (sold separately) to create an access point within a line. Use in noncorrosive environments.

Reducing flanges transition your system to a smaller pipe size. Attach them to a flange with a larger pipe size but with the same flange dimensions.

Flanges

Front

Flat Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Specifications Met:
3/4 Pipe Size: ASME B1.20.1, ASME B16.1, ASTM A126, FM Approved
All other sizes: ASME B1.20.1, ASME B16.1, ASTM A126, FM Approved, UL Listed
Pipe Nipples and Pipe: Use Schedule 40 steel
Fittings: Use Class 125 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
3/4	3 7/8"	1/2"	5/8"	4	2 3/4"	125 psi @ 72° F	125 psi @ 350° F	Iron	68185K111	000000
1	4 1/4"	1/2"	5/8"	4	3 1/8"	125 psi @ 72° F	125 psi @ 350° F	Iron	68185K112	00000
1 1/4	4 5/8"	1/2"	5/8"	4	3 1/2"	125 psi @ 72° F	125 psi @ 350° F	Iron	68185K113	00000
1 1/2	5"	1/2"	5/8"	4	3 7/8"	125 psi @ 72° F	125 psi @ 350° F	Iron	68185K114	00000
2	6"	5/8"	3/4"	4	4 3/4"	125 psi @ 72° F	125 psi @ 350° F	Iron	68185K115	00000
2 1/2	7"	5/8"	3/4"	4	5 1/2"	125 psi @ 72° F	125 psi @ 350° F	Iron	68185K116	00000
3	7 1/2"	5/8"	3/4"	4	6"	125 psi @ 72° F	125 psi @ 350° F	Iron	68185K117	00000
4	9"	5/8"	3/4"	8	7 1/2"	125 psi @ 72° F	125 psi @ 350° F	Iron	68185K118	000000
5	10"	3/4"	7/8"	8	8 1/2"	125 psi @ 72° F	125 psi @ 350° F	Iron	68185K131	000000
6	11"	3/4"	7/8"	8	9 1/2"	125 psi @ 72° F	125 psi @ 350° F	Iron	68185K132	000000
8	13 1/2"	3/4"	7/8"	8	11 3/4"	125 psi @ 72° F	125 psi @ 350° F	Iron	68185K133	000000

Reducing Flanges

Front

Flat Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Specifications Met: ASME B1.20.1, ASME B16.1, ASTM A126, ASTM A153, FM Approved
Pipe Nipples and Pipe: Use Schedule 40 iron and steel
Fittings: Use Class 125 iron and 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
2	2 1/2	7"	5/8"	3/4"	4	5 1/2"	175 psi @ 72° F	125 psi @ 350° F	Iron	68185K101	0000000
2	3	7 1/2"	5/8"	3/4"	4	6"	175 psi @ 72° F	125 psi @ 350° F	Iron	68185K102	000000
2	4	9"	5/8"	3/4"	8	7 1/2"	175 psi @ 72° F	125 psi @ 350° F	Iron	68185K103	000000
3	4	9"	5/8"	3/4"	8	7 1/2"	175 psi @ 72° F	125 psi @ 350° F	Iron	68185K104	000000
4	6	11"	3/4"	7/8"	8	9 1/2"	175 psi @ 72° F	125 psi @ 350° F	Iron	68185K105	000000

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.

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
Fittings: Use Class 125 or 150 iron and steel
Pipe Nipples and Pipe: Use Schedule 40 steel

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
BSPT
1/2	3 1/2"	1/2"	5/8"	4	2 3/8"	285 psi @ 72° F	230 psi @ 300° F	Steel	8128K11	000000
3/4	3 7/8"	1/2"	5/8"	4	2 3/4"	285 psi @ 72° F	230 psi @ 300° F	Steel	8128K12	00000
1	4 1/4"	1/2"	5/8"	4	3 1/8"	285 psi @ 72° F	230 psi @ 300° F	Steel	8128K13	00000
1 1/4	4 5/8"	1/2"	5/8"	4	3 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	8128K14	00000
1 1/2	5"	1/2"	5/8"	4	3 7/8"	285 psi @ 72° F	230 psi @ 300° F	Steel	8128K15	00000
2	6"	5/8"	3/4"	4	4 3/4"	285 psi @ 72° F	230 psi @ 300° F	Steel	8128K16	000000
2 1/2	7"	5/8"	3/4"	4	5 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	8128K17	000000
3	7 1/2"	5/8"	3/4"	4	6"	285 psi @ 72° F	230 psi @ 300° F	Steel	8128K18	000000
4	9"	5/8"	3/4"	8	7 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	8128K21	000000
6	11"	3/4"	7/8"	8	9 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	8128K23	000000

FM-Approved Low-Pressure Cast Iron Unthreaded Pipe Flanges

Front

Flat Surface on Back

For Use With: Air, Diesel Fuel, Gasoline, Natural Gas, Oil, Steam, Water
Pressure Class: 125
Specifications Met: ASME B1.20.1, ASME B16.1, ASTM A126, FM Approved
Pipe Nipples and Pipe: Use Schedule 40 steel
Fittings: Use Class 125 or 150 iron and steel

FM-approved for fire protection applications, these flanges are cast iron, so they're brittle and can be quickly opened by hitting them with a sledge hammer. Bolt them together with a gasket (not included) to create an access point within a low-pressure pipe line. All are cap flanges, which are also known as blind flanges. Use them in noncorrosive environments.

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure		Each
1	4 1/4"	1/2"	5/8"	4	3 1/8"	200 psi @ 72° F	165 psi @ 300° F	4824N11	000000
1 1/2	5"	1/2"	5/8"	4	3 7/8"	200 psi @ 72° F	165 psi @ 300° F	4824N12	00000
2	6"	5/8"	3/4"	4	4 3/4"	200 psi @ 72° F	165 psi @ 300° F	4824N13	00000
2 1/2	7"	5/8"	3/4"	4	5 1/2"	200 psi @ 72° F	165 psi @ 300° F	4824N14	00000
3	7 1/2"	5/8"	3/4"	4	6"	200 psi @ 72° F	165 psi @ 300° F	4824N15	00000
3 1/2	8 1/2"	5/8"	3/4"	8	7"	200 psi @ 72° F	165 psi @ 300° F	4824N16	000000
4	9"	5/8"	3/4"	8	7 1/2"	200 psi @ 72° F	165 psi @ 300° F	4824N17	000000
6	11"	3/4"	7/8"	8	9 1/2"	200 psi @ 72° F	165 psi @ 300° F	4824N18	000000