Schedule XXH Unions | McMaster-Carr

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	Pipe Size Pipe Size

	Thread Type Thread Type

NPT

	Type Type	Show

Union

	Type Type	Hide

	Material Material

Steel

	Connection Style Connection Style

Threaded

Socket Connect

	Pressure Class Pressure Class

6000

	For Pipe Schedule For Pipe Schedule	Show

XXH

	For Pipe Schedule For Pipe Schedule	Hide

160

XXH

	Length Length

	Shape Shape

	Straight

	For Use With For Use With

	Maximum Pressure Maximum Pressure

6,000 psi @ 72° F

3,000 psi @ 100° F

	For Pipe Material For Pipe Material

Steel

	Socket Connect Type Socket Connect Type

	Weld

	Body Shape Body Shape

	Hex

	Maximum Steam Pressure Maximum Steam Pressure

300 psi @ 360° F

1,500 psi @ 700° F

	Dash Size Dash Size

	Specifications Met Specifications Met

ASME

ASTM

MSS

	Gender Gender

Female

	Hex Width Hex Width

	Fabrication Fabrication

Forged

	Connection Type Connection Type

	Pipe

	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

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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 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.

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

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

High-Pressure Socket-Connect Steel Unthreaded Pipe Fittings

Socket-connect fittings 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 have heavy duty construction that stands up to high-pressure applications. They are for use in noncorrosive environments.

Union straight connectors separate into three pieces for access to your line. Union straight connectors with gasket provide extra leak protection.

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

Union Straight Connectors with Gasket

For Use With: Air, Water, Oil, Natural Gas, Steam, Hydraulic Fluid
Temperature Range: -20° to 700° F
Specifications Met: MSS SP-83, ASTM A105
Pipe Nipples and Pipe: Use Schedule XXH steel
Flanges: Use Class 300 and 600 steel

Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	Material	Gasket Material		Each
1/2	08	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	0000000	0000000
3/4	12	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	0000000	00000
1	16	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	0000000	00000
1 1/4	20	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	0000000	000000
1 1/2	24	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	0000000	000000
2	32	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	0000000	000000

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.

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