ASME B16.4 Pipe Caps | McMaster-Carr

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Maximum Pressure @ Temperature

175 psi @ 72° F

Maximum Steam Pressure @ Temperature

125 psi @ 350° F

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14 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.

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.

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

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