Super-Thick-Wall Steel (Schedule XXH) Threaded Pipe

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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.

Super-Thick-Wall Steel Threaded Pipe Nipples and Pipe

Also known as Schedule XXH, this heavy duty pipe has the thickest, strongest walls of all the threaded pipe we offer. Pipe is seamless, so it has a smooth interior for unrestricted flow. Use in noncorrosive environments.

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.

Fully Threaded

For Use With:
1 1/4 Pipe Size: Air, Hydraulic Fluid, Nitrogen Gas, Oil, Steam, Water
All other sizes: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Specifications Met: ASTM A733, ASME B1.20.1, ASTM A106
Fittings: Use Class 6000 steel
Flanges: Use Class 1500 steel

Pipe Size	Dash Size	Lg.	Thread Type	Construction	Material		Each
1/2	08	1 1/8"	NPT	Seamless	Steel	0000000	000000
3/4	12	1 3/8"	NPT	Seamless	Steel	0000000	00000
1	16	1 1/2"	NPT	Seamless	Steel	0000000	00000
1 1/4	20	1 5/8"	NPT	Seamless	Steel	0000000	00000
1 1/2	24	1 3/4"	NPT	Seamless	Steel	0000000	00000
2	32	2"	NPT	Seamless	Steel	0000000	00000

Threaded on Both Ends

For Use With:
Steel: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Iron: Air, Hydraulic Fluid, Nitrogen Gas, Oil, Steam, Water
Specifications Met: ASTM A733, ASME B1.20.1, ASTM A106
Fittings: Use Class 6000 steel
Flanges: Use Class 1500 steel

1/2 Pipe Size —08 Dash Size
Lg.	Thread Type	Construction	Material		Each
1 1/2"	NPT	Seamless	Steel	0000000	000000
2"	NPT	Seamless	Steel	0000000	00000
3"	NPT	Seamless	Steel	0000000	00000
4"	NPT	Seamless	Steel	0000000	00000
5"	NPT	Seamless	Steel	0000000	00000
6"	NPT	Seamless	Steel	0000000	00000
12"	NPT	Seamless	Steel	0000000	00000
18"	NPT	Seamless	Steel	0000000	00000
24"	NPT	Seamless	Steel	0000000	00000
36"	NPT	Seamless	Steel	0000000	000000
3/4 Pipe Size —12 Dash Size
1 1/2"	NPT	Seamless	Steel	0000000	00000
2"	NPT	Seamless	Steel	0000000	00000
3"	NPT	Seamless	Steel	0000000	00000
4"	NPT	Seamless	Steel	0000000	00000
5"	NPT	Seamless	Steel	0000000	00000
6"	NPT	Seamless	Steel	0000000	00000
12"	NPT	Seamless	Steel	0000000	00000
18"	NPT	Seamless	Steel	0000000	00000
24"	NPT	Seamless	Steel	0000000	000000
36"	NPT	Seamless	Steel	0000000	000000
1 Pipe Size —16 Dash Size
2"	NPT	Seamless	Steel	0000000	00000
3"	NPT	Seamless	Steel	0000000	00000
4"	NPT	Seamless	Steel	0000000	00000
5"	NPT	Seamless	Steel	0000000	00000
6"	NPT	Seamless	Steel	0000000	00000
12"	NPT	Seamless	Steel	0000000	000000
18"	NPT	Seamless	Steel	0000000	000000
24"	NPT	Seamless	Steel	0000000	000000
36"	NPT	Seamless	Steel	0000000	000000
1 1/4 Pipe Size —20 Dash Size
2"	NPT	Seamless	Steel	0000000	00000
3"	NPT	Seamless	Steel	0000000	00000
4"	NPT	Seamless	Steel	0000000	00000
5"	NPT	Seamless	Steel	0000000	00000
6"	NPT	Seamless	Steel	0000000	00000
1 1/2 Pipe Size —24 Dash Size
2"	NPT	Seamless	Steel	0000000	00000
3"	NPT	Seamless	Steel	0000000	00000
4"	NPT	Seamless	Steel	0000000	00000
5"	NPT	Seamless	Steel	0000000	00000
6"	NPT	Seamless	Steel	0000000	00000
12"	NPT	Seamless	Steel	0000000	000000
18"	NPT	Seamless	Steel	0000000	000000
24"	NPT	Seamless	Steel	0000000	000000
36"	NPT	Seamless	Steel	0000000	000000
2 Pipe Size —32 Dash Size
3"	NPT	Seamless	Steel	0000000	00000
4"	NPT	Seamless	Steel	0000000	00000
5"	NPT	Seamless	Steel	0000000	00000
6"	NPT	Seamless	Steel	0000000	00000
12"	NPT	Seamless	Steel	0000000	000000
18"	NPT	Seamless	Steel	0000000	000000
24"	NPT	Seamless	Steel	0000000	000000
36"	NPT	Seamless	Steel	0000000	000000

Threaded on One End

For Use With:
Steel: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Iron: Air, Hydraulic Fluid, Nitrogen Gas, Oil, Steam, Water
Specifications Met: ASTM A733, ASME B1.20.1, ASTM A106
Fittings: Use Class 6000 steel
Flanges: Use Class 1500 steel

1/2 Pipe Size—08 Dash Size
Lg.	Thread Type	Construction	Material		Each
1 1/2"	NPT	Seamless	Steel	0000000	000000
2"	NPT	Seamless	Steel	0000000	00000
3"	NPT	Seamless	Steel	0000000	00000
4"	NPT	Seamless	Steel	0000000	00000
5"	NPT	Seamless	Steel	0000000	00000
6"	NPT	Seamless	Steel	0000000	00000
3/4 Pipe Size—12 Dash Size
1 1/2"	NPT	Seamless	Steel	0000000	00000
2"	NPT	Seamless	Steel	0000000	00000
3"	NPT	Seamless	Steel	0000000	00000
4"	NPT	Seamless	Steel	0000000	00000
5"	NPT	Seamless	Steel	0000000	00000
6"	NPT	Seamless	Steel	0000000	00000
1 Pipe Size—16 Dash Size
2"	NPT	Seamless	Steel	0000000	00000
3"	NPT	Seamless	Steel	0000000	00000
4"	NPT	Seamless	Steel	0000000	00000
5"	NPT	Seamless	Steel	0000000	00000
6"	NPT	Seamless	Steel	0000000	00000
1 1/4 Pipe Size—20 Dash Size
2"	NPT	Seamless	Steel	0000000	00000
3"	NPT	Seamless	Steel	0000000	00000
4"	NPT	Seamless	Steel	0000000	00000
5"	NPT	Seamless	Steel	0000000	00000
6"	NPT	Seamless	Steel	0000000	00000
1 1/2 Pipe Size—24 Dash Size
2"	NPT	Seamless	Steel	0000000	00000
3"	NPT	Seamless	Steel	0000000	00000
4"	NPT	Seamless	Steel	0000000	00000
5"	NPT	Seamless	Steel	0000000	00000
6"	NPT	Seamless	Steel	0000000	00000
2 Pipe Size—32 Dash Size
3"	NPT	Seamless	Steel	0000000	00000
4"	NPT	Seamless	Steel	0000000	00000
5"	NPT	Seamless	Steel	0000000	00000
6"	NPT	Seamless	Steel	0000000	00000

Extreme-Pressure Steel Threaded Pipe Fittings

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

Fittings with intermittent swivel have ball bearings and rotate 360° as needed to allow movement in a rigid metal piping system.

Fittings that swivel until tightened rotate for easy installation. They have a quick-access nut that allows you to perform maintenance without removing the fitting from your line.

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

Swivel Straight Connectors

For Use With:
Intermittent Swivel: Coolant, Natural Gas, Water
Swivels Until Tightened: Air, Coolant, Hydraulic Fluid
Temperature Range: -20° to 225° F
Pipe Nipples and Pipe: Use Schedule XXH steel
Flanges: Use Class 1500 steel

NPT Female—Intermittent Swivel
Pipe Size	Dash Size	Max. Pressure	Max. Vacuum	Material		Each
2	__	6,000 psi @ 72° F	29 in. of Hg @ 72° F	Steel	00000000	0000000
NPT Female—Swivels Until Tightened
1	16	6,000 psi @ 72° F	20 in. of Hg @ 72° F	Steel	0000000	000000
1 1/4	20	6,000 psi @ 72° F	20 in. of Hg @ 72° F	Steel	0000000	000000

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

90° Elbow 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	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	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	000000

Swivel 90° Elbow Connectors

For Use With:
Intermittent Swivel: Coolant, Natural Gas, Water
Swivels Until Tightened: Air, Coolant, Hydraulic Fluid
Temperature Range: -20° to 225° F
Pipe Nipples and Pipe: Use Schedule XXH steel
Flanges: Use Class 1500 steel

NPT Female—Intermittent Swivel
Pipe Size	Dash Size	Max. Pressure	Max. Vacuum	Material		Each
2	__	6,000 psi @ 72° F	29 in. of Hg @ 72° F	Steel	00000000	000000000
NPT Female—Swivels Until Tightened
1	16	6,000 psi @ 72° F	20 in. of Hg @ 72° F	Steel	0000000	000000
1 1/4	20	6,000 psi @ 72° F	20 in. of Hg @ 72° F	Steel	0000000	000000

Tee 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	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	00000
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