ASME B16.4 Pipe Fittings

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85 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.

Low-Pressure Iron and Steel Threaded Pipe Fittings

Use these fittings for low-pressure applications in noncorrosive environments.

Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.

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

Locknuts

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class:
NPT: 125
NPSL: 150
Specifications Met:
NPT: ASME B1.20.1, ASME B16.4
NPSL: ASME B16.14
BSPP: DIN 431
Pipe Nipples and Pipe:
NPT, NPSL: Use Schedule 40 steel

NPT Female
Pipe Size	Material		Each
3	Iron	000000000	000000

FM-Approved Low-Pressure Cast Iron Threaded Pipe Fittings

Suitable for use in fire-protection applications, these pipe fittings are made of cast iron, so they are brittle and can be quickly opened with the strike of a sledge hammer. They are also known as Pressure Class 125 fittings. Use in noncorrosive environments.

Offset straight reducers are also known as eccentric reducers; they connect one pipe to another smaller-diameter pipe and have the centers offset so your line can drain.

Inline tees are also known as branch tees.

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

Straight Reducers

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 125
Specifications Met: FM Approved, UL Listed, ASTM A126, ASME B1.20.1, ASME B16.4
Pipe Nipples and Pipe: Use Schedule 40 steel

Pipe Size
(A)	(B)	Max. Pressure	Max. Steam Pressure	Material		Each
NPT Female
3/4	1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000
1	1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1	3/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/4	3/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/4	1	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/2	1	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/2	1 1/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2	1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2	3/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2	1	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2	1 1/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2	1 1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2 1/2	2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
3	1 1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000
3	2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000

Offset Straight Reducers

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 125
Specifications Met: FM Approved, UL Listed, ASTM A126, ASME B1.20.1, ASME B16.4
Pipe Nipples and Pipe: Use Schedule 40 steel

Pipe Size
(A)	(B)	Max. Pressure	Max. Steam Pressure	Material		Each
NPT Female
3/4	1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000
1	1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1	3/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/4	1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/4	3/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/4	1	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/2	1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/2	3/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/2	1	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/2	1 1/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2	1	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000
2	1 1/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000
2	1 1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000

90° Elbow Connectors

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 125
Specifications Met: FM Approved, UL Listed, ASTM A126, ASME B1.20.1, ASME B16.4
Pipe Nipples and Pipe: Use Schedule 40 steel

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
3/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	0000
1	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	0000
1 1/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2 1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
3	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000

45° Elbow Connectors

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 125
Specifications Met: FM Approved, UL Listed, ASTM A126, ASME B1.20.1, ASME B16.4
Pipe Nipples and Pipe: Use Schedule 40 steel

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000
3/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2 1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
3	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000
4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000

Tee Connectors

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 125
Specifications Met: FM Approved, UL Listed, ASTM A126, ASME B1.20.1, ASME B16.4
Pipe Nipples and Pipe: Use Schedule 40 steel

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000
3/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2 1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
3	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000
4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000

Inline Tee Reducers

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 125
Specifications Met: FM Approved, UL Listed, ASTM A126, ASME B1.20.1, ASME B16.4
Pipe Nipples and Pipe: Use Schedule 40 steel

Pipe Size
(A)	(B)	Max. Pressure	Max. Steam Pressure	Material		Each
NPT Female
3/4	1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	000000
1	1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1	3/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/4	1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/4	3/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/4	1	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/2	1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/2	3/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/2	1	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
1 1/2	1 1/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2	1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2	3/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2	1	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2	1 1/4	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000
2	1 1/2	125 psi @ 72° F	125 psi @ 350° F	Iron	00000000	00000

Plugs with Square Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 125
Specifications Met: FM Approved, UL Listed, ASTM A126, ASME B1.20.1, ASME B16.4
Pipe Nipples and Pipe: Use Schedule 40 steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material		Each
1	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	000000
1 1/4	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
1 1/2	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
2	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
2 1/2	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
3	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
4	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	000000

Plugs with External Square Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 125
Specifications Met: FM Approved, UL Listed, ASTM A126, ASME B1.20.1, ASME B16.4
Pipe Nipples and Pipe: Use Schedule 40 steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material		Each
1	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
1 1/4	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	0000
1 1/2	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	0000
2	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	0000
2 1/2	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
3	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
4	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000