1/4 Pipe Size Pipe Flanges

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Flange OD

4 1/4"

Bolt Hole Diameter

0.62"

5/8"

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10 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.

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.

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, MSS SP-6
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	Material		Each
NPT
1/4	1	4 1/4"	1/2"	5/8"	4	3.12"	Not Rated	Steel	1802N11	000000

Low-Pressure Iron and Steel Threaded Pipe Fittings

Use these fittings for low-pressure applications in noncorrosive environments.

Adapters for tanks create an inlet or outlet connection on the surface of any tank, pressure vessel, or drum. Adapters with weld end allow for a permanent connection. Adapters with extension fit tightly into the hole, which keeps the fitting steady during welding.

Straight Adapters with Extension for Flat Tanks

For Use With: Diesel Fuel, Gasoline, Oil, Water
Specifications Met: ASTM A181, ASME B1.20.1

NPT Female × Weld
Pipe Size	For Hole Dia.	OD	Lg.	Material		Each
1/4	15/16"	1 5/16"	3/8"	Carbon Steel	12555K81	00000
1/4	15/16"	1 1/2"	9/16"	Carbon Steel	12555K71	0000

Straight Adapters for Flat Tanks

For Use With: Diesel Fuel, Gasoline, Oil, Water
Specifications Met: ASTM A105, ASTM A181

NPT Female × Weld
Pipe Size	For Hole Dia.	OD	Lg.	Material		Each
1/4	3/4"	1 1/4"	5/16"	Carbon Steel	12555K51	00000

Low-Pressure Stainless Steel Threaded Pipe Flanges

Also known as Pressure Class 150 flanges, these are designed for low-pressure pipe 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 within a line.

304 stainless steel flanges have very good corrosion resistance. 316 stainless steel flanges have excellent corrosion resistance.

Forged flanges have better strength than cast flanges. They are also called ANSI flanges.

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.

Reducing Flanges—Forged

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: 150
Specifications Met: ASTM A182, ASME B16.5
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Fittings: Use Class 150 stainless 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		Each
304/304L Stainless Steel
NPT
1/4	1	4 1/4"	1/2"	0.62"	4	3 1/8"	230 psi @ 72° F	150 psi @ 360° F	44685K331	000000
316/316L Stainless Steel
NPT
1/4	1	4 1/4"	1/2"	0.62"	4	3 1/8"	230 psi @ 72° F	150 psi @ 360° F	44695K26	00000

Low-Pressure Stainless Steel Threaded Pipe Fittings

Use these fittings in a low-pressure pipe line. 316 stainless steel fittings have excellent corrosion resistance. Adapters with weld end allow for a permanent connection.

Adapters for tanks create an inlet or outlet connection on the surface of any tank, pressure vessel, or drum. Adapters with extension fit tightly into the hole, which keeps the fitting steady during welding.

Straight Adapters with Extension for Flat Tanks

For Use With: Water, Oil, Gasoline, Diesel Fuel
Specifications Met: ASTM A182, ASME B1.20.1

				316 Stainless Steel
Pipe Size	For Hole Dia.	OD	Lg.		Each
NPT Female × Weld
1/4	15/16"	1 1/2"	5/16"	1145K51	000000

Low-Pressure Aluminum Threaded Pipe Fittings

In addition to being lightweight, these aluminum fittings offer good corrosion resistance. Use them in low-pressure flow applications. To prevent cracking, do not tighten more than a 1/4-turn past hand tight.

Adapters for tanks weld onto the surface of any tank, pressure vessel, or drum to create a permanent inlet or outlet connection. Adapters with extended lip fit tightly into the hole, which keeps the fitting steady during welding.

Straight Adapters with Extension for Flat Tanks

For Use With: Water, Oil, Gasoline, Diesel Fuel
Specifications Met: ASTM B221
Pipe Nipples and Pipe: Use Schedule 40 aluminum

NPT Female × Weld
Pipe Size	For Hole Dia.	OD	Lg.		Each
1/4	7/8"	1 5/16"	1/4"	8694T42	000000

Spin-Weld Through-Wall Plastic Tank Fittings

Create a leak-free, durable connection in plastic tanks, walls, or panels without gaskets or sealants. As you spin these fittings with a handheld electric router, they melt into the surface of your tank for a seal without any joints. To hold these fittings in your router, you’ll need the installation tool (sold separately).

For proper installation, you’ll want to use a hole saw to drill a hole that matches the For Hole Diameter listed and check that your router meets the speed and power requirements shown in the table.

Fittings

For Use With: Oil, Water
Temperature Range: 40° to 140° F

					For Tank			For Router
Pipe Size	For Hole Dia.	For Min. Wall Thick.	Lg.	Material	Material	Surface	Color	Power	Speed, rpm		Each
NPT Female Threaded Pipe × Weld
1/4	0.88"	3/16"	15/16"	LDPE Plastic	LDPE Plastic	Flat	White	1 1/2	18,000-25,000	4526N11	00000

Installation Tools

For Pipe Connection
For Pipe Size	Shank Dia.	Overall Lg.	Material	Shank Type	For Tool Type		Each
1/4	1/4"	1 5/8"	Aluminum	Straight	Hand Router	4526N1	0000000