Schedule XXH Unions | McMaster-Carr

Filter by

Fitting Type

System of Measurement

Pipe Size

Material

Graphite-Filled 304 Stainless Steel

Steel

Pressure Class

6000

Pipe Schedule

Shape

Fitting Connection

Maximum Pressure @ Temperature

For Use With

Length

Thread Type

Gender

Connects To

Pipe Material

For Flange Class

Body Shape

Flange Material

Hex Width

RoHS

Maximum Steam Pressure @ Temperature

300 psi @ 360° F

1,500 psi @ 700° F

Fabrication

Forged

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

REACH

20 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.

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.

Note: The maximum pressure listed for Class 6000 fittings is for conditions where there are no sudden changes in pressure or velocity. Please refer to ASME B16.11 to determine the specific maximum operating pressure for your application.

Union Straight Connectors

Exploded View

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	43455K31	000000
3/8	06	6,000 psi @ 72° F	300 psi @ 360° F	Steel	43455K32	00000
1/2	08	6,000 psi @ 72° F	300 psi @ 360° F	Steel	43455K93	00000
3/4	12	6,000 psi @ 72° F	300 psi @ 360° F	Steel	43455K94	00000
1	16	6,000 psi @ 72° F	300 psi @ 360° F	Steel	43455K95	00000
1 1/4	20	6,000 psi @ 72° F	300 psi @ 360° F	Steel	43455K113	000000
1 1/2	24	6,000 psi @ 72° F	300 psi @ 360° F	Steel	43455K97	000000
2	32	6,000 psi @ 72° F	300 psi @ 360° F	Steel	43455K98	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.

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	4690K17	0000000
3/4	12	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	4690K18	000000
1	16	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	4690K19	000000
1 1/4	20	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	4690K21	000000
1 1/2	24	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	4690K22	000000
2	32	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	4690K23	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.

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	43665K254	000000
3/4	12	6,000 psi @ 72° F	300 psi @ 360° F	43665K255	00000
1	16	6,000 psi @ 72° F	300 psi @ 360° F	43665K256	00000
1 1/4	20	6,000 psi @ 72° F	300 psi @ 360° F	43665K257	00000
1 1/2	24	6,000 psi @ 72° F	300 psi @ 360° F	43665K258	000000
2	32	6,000 psi @ 72° F	300 psi @ 360° F	43665K259	000000