5 NPT Pipe Fittings | McMaster-Carr

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	Pipe Size Pipe Size	Show

	Pipe Size Pipe Size	Hide

1/16
1/8
1/4
3/8
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10

	Thread Type Thread Type

NPT

	Type Type


Adapter	Bushing

Flange	Reducing Adapter

	Connection Style Connection Style

	Material Material

	Gender Gender

Female

Male

	For Use With For Use With

	For Pipe Material For Pipe Material

Plastic

Steel

	Connection Type Connection Type


Pipe	Tube

Hose

	For Pipe Schedule For Pipe Schedule


40	80

	Pressure Class Pressure Class

125

150

300

	Shape Shape

	Straight

	Body Shape Body Shape


Hex	Round

	System of Measurement System of Measurement

Inch

	Flange OD Flange OD

10"

11"

	Bolt Circle Diameter Bolt Circle Diameter

8 1/2"

9 1/4"

9 1/2"

	Maximum Pressure Maximum Pressure

	Schedule Schedule

	40

	Number of Bolt Holes Number of Bolt Holes

	Length Length

	Maximum Steam Pressure Maximum Steam Pressure

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

DFARS Specialty Metals
COTS-Exempt

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

RoHS Compliant

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

REACH Compliant

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15 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 Iron and Steel Threaded Pipe Fittings

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

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

Bushing Straight Reducing Adapters with Hex Body

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: See table
Pipe Nipples and Pipe: Use Schedule 40 steel

Pipe Size
(A)	(B)	Pressure Class	Max. Pressure	Max. Steam Pressure	Material	Specifications Met		Each
NPT Male × NPT Female
6	5	125	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	ASME B16.14	000000000	0000000

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
5	10"	3/4"	7/8"	8	8 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	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
5	6	11"	7/8"	0.88"	8	9 1/2"	285 psi @ 72° F	230 psi @ 300° F	Steel	0000000	0000000

FM-Approved Low-Pressure Cast Iron Threaded Pipe 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 or 150 iron and steel

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.

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
5	10"	3/4"	7/8"	8	8 1/2"	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	0000000

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
5	10"	3/4"	7/8"	8	8 1/2"	285 psi @ 72° F	150 psi @ 300° F	00000000	0000000

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
5	11"	3/4"	7/8"	8	9 1/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	0000000

Standard-Wall Plastic Pipe Fittings for Water

Connect these fittings to Schedule 40 plastic pipe–they are the industry standard for residential and commercial low-pressure plumbing and water supply applications. They are plastic for good corrosion resistance.

Fittings for drinking water meet NSF/ANSI Standard 61.

Attach socket-connect ends to unthreaded pipe or another socket-connect fitting with a PVC primer and cement (also known as solvent weld).

To prevent leaks in threaded connections, apply a sealant to the male threads. For plastic threads, apply a non-hardening, plastic-compatible sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic connections. Fittings that meet ASTM D1784, ASTM D1785, and ASTM D4066 adhere to specifications and testing requirements for material quality.

Note: For fittings that are not rated for pressure, you can use the pressure rating of the plastic pipe as a reference. Threaded fittings are limited to 50% of the rated pressure of the pipe.

Warning: Never use plastic pipe fittings and pipe with compressed air or gas.

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

Straight Adapters, Female Socket Connect × Female Threaded Pipe

For Use With: Drinking Water, Water
Maximum Temperature: 140° F
Specifications Met: See table
Pipe Nipples and Pipe: Use Schedule 40 PVC Plastic
Flanges: Use Schedule 40 PVC Plastic

NPT Threads
Pipe Size	Socket Depth	Material	Color	Max. Pressure	Specifications Met		Each
5	3"	PVC Plastic	White	Not Rated	ASTM D1784, NSF/ANSI 61	00000000	000000

Straight Adapters, Female Socket Connect × Male Threaded Pipe

For Use With: Drinking Water, Water
Maximum Temperature: 140° F
Specifications Met: See table
Pipe Nipples and Pipe: Use Schedule 40 PVC Plastic
Flanges: Use Schedule 40 PVC Plastic

NPT Threads
Pipe Size	Socket Depth	Material	Color	Max. Pressure	Specifications Met		Each
5	3 1/32"	PVC Plastic	White	Not Rated	ASTM D1784, NSF/ANSI 61	00000000	000000

Vacuum Fittings for Steel Tubing

For Use With: Air, Glass, Plastic Pellets, Resins, Wood Chips
Temperature Range: -10° to 180° F
Tubing: Galvanized Steel: Use with steel, galvanized steel
Steel: Use with steel

Use these fittings to create an air vacuum system without the hassle of brazing and welding. Insert two fittings into a clamp (sold separately) and tighten to form a secure seal.

Galvanized steel fittings have fair corrosion resistance. Fittings without a finish should only be used in noncorrosive environments.

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

Straight Adapters, Tube × Male Threaded Pipe

				Galvanized Steel		Steel
For Tube OD	Pipe Size	Max. Pressure	Max. Vacuum		Each		Each
NPT Threads
5"	5	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	0000000	0000000	000000

Straight Adapters, Tube × Female Threaded Pipe

				Galvanized Steel		Steel
For Tube OD	Pipe Size	Max. Pressure	Max. Vacuum		Each		Each
NPT Threads
5"	5	15 psi @ 72° F	15 in. of Hg @ 72° F	00000000	0000000	0000000	0000000

Easy-Fit Barbed Hose Fittings for Air and Water

Low-profile barbs and a longer first barb allow for a smoother, easier installation than other barbed fittings. Slide the barbed end into rubber hose and secure with a clamp.

Steel fittings are stronger and more durable than other metal fittings. They should be used in noncorrosive environments. Zinc-plated steel fittings have slightly better corrosion resistance than unplated steel fittings. Fittings with a threaded end are also known as hose nipples.

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

Straight Adapters, Hose × NPT Male Threaded Pipe

Straight Adapter with Round Body

Maximum Pressure: 125 psi @ 72° F, except For 5" to 8" Hose IDs: 100 psi @ 72° F
Maximum Vacuum: For 1/2" to 4" Hose IDs: 26 in. of Hg @ 72° F
Temperature Range: -20° to 200° F
Attachment Type: Use Worm-Drive Clamps, Bolt Clamps or Band-and-Buckle Clamps
Specifications Met: See table

Steel
For Hose ID	Pipe Size	Body Shape	Specifications Met		Each
5"	5	Round	ASME B1.20.1, ASTM A53	0000000	000000
Zinc-Plated Steel
5"	5	Round	ASME B1.20.1, ASTM A53	0000000	00000

Easy-Fit Barbed Hose Fittings for Chemicals

Low-profile barbs and a longer first barb allow for a smoother, easier installation than other barbed fittings. Slide the barbed end into rubber hose and secure with a clamp. Fittings are 316 stainless steel, which has excellent corrosion resistance to withstand a variety of chemicals.

Adapters are also known as hose nipples; they adapt a barbed end to a threaded end.

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

Straight Adapters, Hose × NPT Male Threaded Pipe

Round Body

For Use With: Acetone, Isopropyl Alcohol, Mineral Oil, Sodium Hydroxide
Maximum Pressure: See table
Maximum Vacuum: 26 in. of Hg @ 72° F
Temperature Range: -20° to 200° F
Attachment Type: Use Worm-Drive Clamps, Bolt Clamps or Band-and-Buckle Clamps
Specifications Met: ASME B1.20.1, ASTM A312

316 Stainless Steel
For Hose ID	Pipe Size	Body Shape	Max. Pressure		Each
5"	5	Round	45 psi @ 72° F	0000000	0000000