Alloy 20 Pipe Couplings | McMaster-Carr

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	Material Material

Stainless Steel

	For Pipe Material For Pipe Material

Stainless Steel

	Pipe Size Pipe Size

	Thread Type Thread Type

NPT

	Type Type

	Shape Shape

	Straight

	System of Measurement System of Measurement

Inch

	Length Length

	Connection Style Connection Style

Threaded

	Gender Gender

Female

Male

	For Use With For Use With

Air

Steam

Water

	Threading Threading

	Threaded on Both Ends
	Fully Threaded

	For Pipe Schedule For Pipe Schedule

	40

	Connection Type Connection Type

	Pipe

	Construction Construction

Seamless

	Maximum Pressure Maximum Pressure

300 psi @ 72° F

1,000 psi @ 72° F

Not Rated

	Pressure Class Pressure Class

1000

Not Rated

	Body Shape Body Shape

	Hex

	Specifications Met Specifications Met

ANSI/MSS

ASME

ASTM

	Schedule Schedule

	40

	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

	Hex Width Hex Width

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

DFARS Specialty Metals
COTS-Exempt

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30 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.

Standard-Wall Stainless Steel Threaded Pipe Nipples and Pipe

Designed for low-pressure flow applications, this pipe is also known as Schedule 40. Alloy 20 stainless steel pipe has the best corrosion resistance of all the stainless steel pipe we offer. Alloy 20 stainless steel is also known as Carpenter 20 and resists cracking from stress and corrosion.

Seamless pipe has a smooth interior for unrestricted flow and is stronger than welded pipe.

Fully threaded pipe is also known as a close nipple; it is threaded on each end to the center.

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

NPT Fully Threaded—Alloy 20 Stainless Steel

For Use With: Water, Steam, Air
Specifications Met: ASTM B729, ASME B1.20.1
Fittings: Use Class 150 stainless steel
Flanges: Use Class 150 stainless steel

Pipe Size	Lg.	Construction		Each
1/2	1 1/8"	Seamless	0000000	000000
3/4	1 3/8"	Seamless	0000000	00000
1	1 1/2"	Seamless	0000000	00000
2	2"	Seamless	0000000	000000

NPT Threaded on Both Ends—Alloy 20 Stainless Steel

For Use With: Water, Steam, Air
Specifications Met: ASTM B729, ASME B1.20.1
Fittings: Use Class 150 stainless steel
Flanges: Use Class 150 stainless steel

1/2 Pipe Size
Lg.	Construction		Each
2"	Seamless	0000000	000000
3"	Seamless	0000000	00000
4"	Seamless	0000000	00000
6"	Seamless	0000000	000000
3/4 Pipe Size
2"	Seamless	0000000	00000
3"	Seamless	0000000	00000
4"	Seamless	0000000	00000
6"	Seamless	0000000	000000
1 Pipe Size
2"	Seamless	0000000	00000
3"	Seamless	0000000	00000
4"	Seamless	0000000	000000
1 1/2 Pipe Size
2"	Seamless	0000000	000000
3"	Seamless	0000000	000000
2 Pipe Size
6"	Seamless	0000000	000000

Medium-Pressure Stainless Steel Threaded Pipe Fittings

Choose these fittings when you want the same high-quality found in our low-pressure pipe fittings, but need more strength to handle higher pressures.

Fittings that meet ANSI/MSS SP-114 adhere to high-quality standards for heat treating, material thickness, and marking. Alloy 20 stainless steel fittings have the best corrosion resistance of all the stainless steel fittings we offer. Alloy 20 stainless steel is also known as Carpenter 20 and resists cracking from stress and corrosion.

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

Straight Connectors, Female

For Use With:
Alloy 20 connectors: Air, Steam, Water
All other connectors: Air, Natural Gas, Oil, Steam, Water
Pressure Class: 1000
Specifications Met:
Alloy 20 connectors: ANSI/MSS SP-114, ASME B1.20.1, ASTM B473
All other connectors: ANSI/MSS SP-114, ASTM A182
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Flanges: Use Class 150 stainless steel

Alloy 20 Stainless Steel
Pipe Size	Max. Pressure	Max. Steam Pressure		Each
NPT Female
1/8	1,000 psi @ 72° F	560 psi @ 360° F	0000000	000000
1/2	300 psi @ 72° F	150 psi @ 360° F	0000000	00000
3/4	300 psi @ 72° F	150 psi @ 360° F	0000000	000000
1	300 psi @ 72° F	150 psi @ 360° F	0000000	000000

Straight Connectors, Male

For Use With:
316 Stainless Steel: Air, Coolant, Natural Gas, Oil, Steam, Water
Alloy 20 Stainless Steel: Air, Steam, Water
Pressure Class:
316 Stainless Steel: 150
Alloy 20 Stainless Steel: Not Rated
Specifications Met: See Table
Pipe Nipples and Pipe:
316 Stainless Steel: Use Schedule 40 316/316L stainless steel
Alloy 20 Stainless Steel: Use Schedule 40 alloy 20 stainless steel
Flanges:
316 Stainless Steel: Use 316/316L stainless steel
Alloy 20 Stainless Steel: Use Class 150 alloy 20 stainless steel

				Alloy 20 Stainless Steel
Pipe Size	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
NPT Male
1/4	Not Rated	Not Rated	ASME B1.20.1, ASTM B473	0000000	0000000
3/4	Not Rated	Not Rated	ASME B1.20.1, ASTM B473	0000000	000000
1	Not Rated	Not Rated	ASME B1.20.1, ASTM B473	0000000	000000

Bushing Straight Reducing Adapters

For Use With: Air, Water, Steam
Pressure Class: Not Rated
Specifications Met: ASTM B473, ASME B16.11, ASME B1.20.1
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Flanges: Use Class 150 stainless steel

Pipe Size				Alloy 20 Stainless Steel
(A)	(B)	Max. Pressure	Max. Steam Pressure		Each
NPT Male × NPT Female
1/4	1/8	Not Rated	Not Rated	0000000	000000
3/8	1/4	Not Rated	Not Rated	0000000	00000
1/2	1/4	300 psi @ 72° F	150 psi @ 360° F	0000000	000000
3/4	1/2	300 psi @ 72° F	150 psi @ 360° F	0000000	000000
1	3/4	300 psi @ 72° F	150 psi @ 360° F	0000000	000000