Class 6000 Couplings | McMaster-Carr

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	Pipe Size Pipe Size

	Thread Type Thread Type

NPT

	Type Type


Connector	Adapter

Union	Cap

	Material Material

Stainless Steel

Steel

	Pressure Class Pressure Class	Show

6000

	Pressure Class Pressure Class	Hide

125
150
200
250
300
1000
3000
6000
Not Rated

	Shape Shape


Straight	Tee

90° Elbow	Cap/Plug

45° Elbow

	Connection Style Connection Style

Threaded

Socket Connect

Butt Weld

	For Pipe Schedule For Pipe Schedule


160	XXH

	For Pipe Material For Pipe Material

Stainless Steel

Steel

	System of Measurement System of Measurement

Inch

	Length Length

	Maximum Pressure Maximum Pressure

	Gender Gender

Female

	For Use With For Use With

	Specifications Met Specifications Met

ASME

ASTM

	Connection Type Connection Type

	Pipe

	Maximum Steam Pressure Maximum Steam Pressure

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

DFARS Specialty Metals
COTS-Exempt

	Dash Size Dash Size

	Fabrication Fabrication

Forged

	Socket Connect Type Socket Connect Type

	Weld

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

REACH Compliant

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

RoHS Compliant

	Weight Weight

93 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.

Extreme-Pressure Socket-Connect Stainless Steel Unthreaded Pipe Fittings

The strongest socket-connect fittings we offer, these heavy duty forged fittings are also known as Pressure Class 6000. They are easier to weld than butt-weld fittings because the fitting doesn’t need to align perfectly to the pipe. Slide pipe into the socket and weld for a strong, permanent connection.

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

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

Straight Connectors

For Use With: Air, Natural Gas, Oil, Water, Steam
Pressure Class : 6000
Specifications Met: ASME B16.11, ASTM A182, ASME B1.20.1
Pipe: Use Schedule 160 stainless steel

		304/304L Stainless Steel			316/316L Stainless Steel
Pipe Size	Max. Pressure	Max. Steam Pressure		Each	Max. Steam Pressure		Each
1/2	7,700 psi @ 72° F	6,500 psi @ 220° F	0000000	000000	6,400 psi @ 220° F	0000000	000000
3/4	7,100 psi @ 72° F	5,900 psi @ 220° F	0000000	00000	5,900 psi @ 220° F	0000000	00000
1	6,400 psi @ 72° F	5,300 psi @ 220° F	0000000	00000	5,300 psi @ 220° F	0000000	000000
1 1/2	4,800 psi @ 72° F	4,000 psi @ 220° F	0000000	000000	3,900 psi @ 220° F	0000000	000000
2	4,700 psi @ 72° F	3,900 psi @ 220° F	0000000	000000	3,800 psi @ 220° F	0000000	000000

90° Elbow Connectors

For Use With: Air, Natural Gas, Oil, Water, Steam
Pressure Class : 6000
Specifications Met: ASME B16.11, ASTM A182, ASME B1.20.1
Pipe: Use Schedule 160 stainless steel

		304/304L Stainless Steel			316/316L Stainless Steel
Pipe Size	Max. Pressure	Max. Steam Pressure		Each	Max. Steam Pressure		Each
1/2	7,700 psi @ 72° F	6,500 psi @ 220° F	0000000	000000	6,400 psi @ 220° F	0000000	0000000
3/4	7,100 psi @ 72° F	5,900 psi @ 220° F	0000000	000000	5,900 psi @ 220° F	0000000	000000
1	6,400 psi @ 72° F	5,300 psi @ 220° F	0000000	000000	5,300 psi @ 220° F	0000000	000000
1 1/2	4,800 psi @ 72° F	4,000 psi @ 220° F	0000000	000000	3,900 psi @ 220° F	0000000	000000
2	4,700 psi @ 72° F	3,900 psi @ 220° F	0000000	000000	3,800 psi @ 220° F	0000000	000000

45° Elbow Connectors

For Use With: Air, Natural Gas, Oil, Water, Steam
Pressure Class : 6000
Specifications Met: ASME B16.11, ASTM A182, ASME B1.20.1
Pipe: Use Schedule 160 stainless steel

		304/304L Stainless Steel			316/316L Stainless Steel
Pipe Size	Max. Pressure	Max. Steam Pressure		Each	Max. Steam Pressure		Each
1/2	7,700 psi @ 72° F	6,500 psi @ 220° F	0000000	0000000	6,400 psi @ 220° F	0000000	0000000
3/4	7,100 psi @ 72° F	5,900 psi @ 220° F	0000000	000000	5,900 psi @ 220° F	0000000	000000
1	6,400 psi @ 72° F	5,300 psi @ 220° F	0000000	000000	5,300 psi @ 220° F	0000000	000000
1 1/2	4,800 psi @ 72° F	4,000 psi @ 220° F	0000000	000000	3,900 psi @ 220° F	0000000	000000
2	4,700 psi @ 72° F	3,900 psi @ 220° F	0000000	000000	3,800 psi @ 220° F	0000000	000000

Tee Connectors

For Use With: Air, Natural Gas, Oil, Water, Steam
Pressure Class : 6000
Specifications Met: ASME B16.11, ASTM A182, ASME B1.20.1
Pipe: Use Schedule 160 stainless steel

		304/304L Stainless Steel			316/316L Stainless Steel
Pipe Size	Max. Pressure	Max. Steam Pressure		Each	Max. Steam Pressure		Each
1/2	7,700 psi @ 72° F	6,500 psi @ 220° F	0000000	0000000	6,400 psi @ 220° F	0000000	0000000
3/4	7,100 psi @ 72° F	5,900 psi @ 220° F	0000000	000000	5,900 psi @ 220° F	0000000	000000
1	6,400 psi @ 72° F	5,300 psi @ 220° F	0000000	000000	5,300 psi @ 220° F	0000000	000000
1 1/2	4,800 psi @ 72° F	4,000 psi @ 220° F	0000000	000000	3,900 psi @ 220° F	0000000	000000
2	4,700 psi @ 72° F	3,900 psi @ 220° F	0000000	000000	3,800 psi @ 220° F	0000000	000000

Caps

For Use With: Air, Natural Gas, Oil, Water, Steam
Pressure Class : 6000
Specifications Met: ASME B16.11, ASTM A182, ASME B1.20.1
Pipe: Use Schedule 160 stainless steel

		304/304L Stainless Steel
Pipe Size	Max. Pressure	Max. Steam Pressure		Each
1/2	7,700 psi @ 72° F	6,500 psi @ 220° F	0000000	000000
3/4	7,100 psi @ 72° F	5,900 psi @ 220° F	0000000	00000
1	6,400 psi @ 72° F	5,300 psi @ 220° F	0000000	00000
1 1/2	4,800 psi @ 72° F	4,000 psi @ 220° F	0000000	000000
2	4,700 psi @ 72° F	3,900 psi @ 220° F	0000000	000000

Extreme-Pressure Steel Threaded Pipe Fittings

The strongest steel fittings we offer, these can withstand extreme-pressure applications.

Union connectors separate into three pieces so you can access your line without unthreading pipe connections.

Threaded female x butt weld straight adapters are also known as half couplings.

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

Straight Connectors

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class : 6000
Specifications Met: ASME B1.20.1, ASME B16.11, ASTM A105
Pipe Nipples and Pipe: Use Schedule XXH steel
Flanges: Use Class 1500 steel

NPT Female
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/4	04	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	000000
3/8	06	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
1/2	08	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	0000
3/4	12	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
1	16	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
1 1/4	20	6,000 psi @ 72° F	300 psi @ 360° F	Steel	000000000	00000
1 1/2	24	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
2	32	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000

Union Straight Connectors

Exploded View

UN/UNF
(SAE Straight) Male
Threads with Gasket

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class : 6000
Specifications Met: ASME B1.20.1, ASTM A105
Pipe Nipples and Pipe: Use Schedule XXH steel
Flanges: Use Class 1500 steel

NPT Female
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/4	04	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	000000
3/8	06	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
1/2	08	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
3/4	12	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
1	16	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
1 1/4	20	6,000 psi @ 72° F	300 psi @ 360° F	Steel	000000000	000000
1 1/2	24	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	000000
2	32	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	000000

Straight Adapters

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class : 6000
Specifications Met: ASME B1.20.1, ASME B16.11, ASTM A105
Pipe Nipples and Pipe: Use Schedule XXH steel
Flanges: Use Class 1500 steel

NPT Female × Butt Weld
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/4	04	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
3/8	06	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	0000
1/2	08	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	0000
3/4	12	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	0000
1	16	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	0000
1 1/4	20	6,000 psi @ 72° F	300 psi @ 360° F	Steel	000000000	00000
1 1/2	24	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
2	32	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000

Extreme-Pressure Socket-Connect Steel Unthreaded Pipe Fittings

Also known as Pressure Class 6000 fittings, these heavy duty forged fittings are the strongest steel fittings we offer. They are easier to weld than butt-weld fittings because the fitting doesn’t need to align perfectly to the pipe. Slide pipe into the socket and weld for a strong, permanent connection. Fittings are for use in noncorrosive environments.

Union straight connectors separate into three pieces for access to your line.

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

Straight Connectors

For Use With: Air, Water, Oil, Natural Gas, Steam, Hydraulic Fluid
Pressure Class: 6000
Specifications Met: ASME B16.11, ASTM A105
Pipe Nipples and Pipe: Use Schedule XXM steel
Flanges: Use 1500 class steel

Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure		Each
1/2	08	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
3/4	12	6,000 psi @ 72° F	300 psi @ 360° F	000000000	0000
1	16	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
1 1/4	20	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
1 1/2	24	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
2	32	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000

Union Straight Connectors

Exploded View

For Use With: Air, Water, Oil, Natural Gas, Steam, Hydraulic Fluid
Pressure Class : 6000
Specifications Met: ASTM A105
Pipe Nipples and Pipe: Use Schedule XXH steel
Flanges: Use Class 1500 steel

Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure		Each
1/2	08	6,000 psi @ 72° F	300 psi @ 360° F	000000000	000000
3/4	12	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
1	16	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
1 1/4	20	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
1 1/2	24	6,000 psi @ 72° F	300 psi @ 360° F	000000000	000000
2	32	6,000 psi @ 72° F	300 psi @ 360° F	000000000	000000

90° Elbow Connectors

For Use With: Air, Water, Oil, Natural Gas, Steam, Hydraulic Fluid
Pressure Class : 6000
Specifications Met: ASME B16.11, ASTM A105
Pipe Nipples and Pipe: Use Schedule XXH steel
Flanges: Use Class 1500 steel

Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure		Each
1/2	08	6,000 psi @ 72° F	300 psi @ 360° F	000000000	000000
3/4	12	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
1	16	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
1 1/4	20	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
1 1/2	24	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
2	32	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000

Tee Connectors

For Use With: Air, Water, Oil, Natural Gas, Steam, Hydraulic Fluid
Pressure Class : 6000
Specifications Met: ASME B16.11, ASTM A105
Pipe Nipples and Pipe: Use Schedule XXH steel
Flanges: Use Class 1500 steel

Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure		Each
1/2	08	6,000 psi @ 72° F	300 psi @ 360° F	000000000	000000
3/4	12	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
1	16	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
1 1/4	20	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
1 1/2	24	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
2	32	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000