ASME B16.3 Pipe Caps | McMaster-Carr

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39 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.

Low-Pressure Iron and Steel Threaded Pipe Fittings

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

Caps

For Use With: Air, Steam, Oil, Water, Natural Gas
Specifications Met:
NPT: ASME B1.20.1, ASME B16.3
BSPT: DIN EN 10226
Pipe Nipples and Pipe: Use Schedule 40 steel

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1	150 psi @ 72° F	150 psi @ 350° F	Iron	44605K654	00000
1 1/4	150 psi @ 72° F	150 psi @ 350° F	Iron	44605K655	0000
1 1/2	150 psi @ 72° F	150 psi @ 350° F	Iron	44605K656	00000
2	150 psi @ 72° F	150 psi @ 350° F	Iron	44605K657	00000
2 1/2	150 psi @ 72° F	150 psi @ 350° F	Iron	44605K658	00000
3	150 psi @ 72° F	150 psi @ 350° F	Iron	44605K391	00000
4	150 psi @ 72° F	150 psi @ 350° F	Iron	44605K392	00000
6	150 psi @ 72° F	150 psi @ 350° F	Iron	44605K536	000000

Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

The galvanized finish on these fittings provides fair corrosion resistance. Fittings are for use in low-pressure applications.

Caps

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 150
Specifications Met:
NPT: ASME B1.20.1, ASME B16.3, ASTM A153, UL Listed
BSPT: ASTM A197, DIN EN 10226
Pipe Nipples and Pipe: Use Schedule 40 steel
Flanges: Use Class 150 galvanized steel

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	4638K777	00000
1 1/4	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	4638K778	00000
1 1/2	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	4638K779	00000
2	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	4638K781	00000
2 1/2	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	4638K782	00000
3	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	4638K262	00000
4	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	4638K263	000000
6	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	4638K497	000000

Medium-Pressure Iron and Steel Threaded Pipe Fittings

With better strength than our low-pressure iron and steel pipe fittings, these can handle medium-pressure applications. They are for use in noncorrosive environments.

Caps

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class : 300
Specifications Met: ASTM A197, UL Listed, ASME B16.3, ASME B1.20.1
Pipe Nipples and Pipe: Use Schedule 80 steel
Flanges: Use Class 300 or 600 steel

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/4	2,000 psi @ 72° F	300 psi @ 550° F	Iron	4627K171	000000
3/8	2,000 psi @ 72° F	300 psi @ 550° F	Iron	4627K172	00000
1/2	2,000 psi @ 72° F	300 psi @ 550° F	Iron	4627K173	00000
3/4	2,000 psi @ 72° F	300 psi @ 550° F	Iron	4627K174	00000
1	2,000 psi @ 72° F	300 psi @ 550° F	Iron	4627K275	00000
1 1/4	1,500 psi @ 72° F	300 psi @ 550° F	Iron	4627K276	00000
1 1/2	1,500 psi @ 72° F	300 psi @ 550° F	Iron	4627K277	00000
2	1,500 psi @ 72° F	300 psi @ 550° F	Iron	4627K278	00000
2 1/2	1,000 psi @ 72° F	300 psi @ 550° F	Iron	4627K409	000000
3	1,000 psi @ 72° F	300 psi @ 550° F	Iron	4627K411	000000

Plugs with Hex Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class : 300
Specifications Met: See Table
Pipe Nipples and Pipe: Use Schedule 80 steel
Flanges: Use Class 300 or 600 steel

NPT Male
Pipe Size	Drive Size	Max. Pressure	Max. Steam Pressure	Material	Specifications Met		Each
1/4	1/4"	2,000 psi @ 72° F	300 psi @ 550° F	Steel	ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed	6367N14	00000
3/8	5/16"	2,000 psi @ 72° F	300 psi @ 550° F	Steel	ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed	6367N15	000
1/2	3/8"	2,000 psi @ 72° F	300 psi @ 550° F	Steel	ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed	6367N16	0000
3/4	9/16"	2,000 psi @ 72° F	300 psi @ 550° F	Steel	ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed	6367N17	0000
1	5/8"	2,000 psi @ 72° F	300 psi @ 550° F	Steel	ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed	6367N18	0000

Medium-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

A galvanized finish gives these fittings fair corrosion resistance. They have the strength to handle medium-pressure applications.

Caps

For Use With: Air, Natural Gas, Steam, Water
Pressure Class : 300
Specifications Met: ASTM A153, ASTM A197, ASME B16.3, ASME B1.20.1
Pipe Nipples and Pipe: Use Schedule 80 steel
Flanges: Use Class 300 steel

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/4	2,000 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	2066N59	000000
3/8	2,000 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	2066N6	00000
1/2	2,000 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	2066N61	00000
3/4	2,000 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	2066N62	00000
1	2,000 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	2066N63	00000
1 1/4	1,500 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	2066N64	00000
1 1/2	1,500 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	2066N65	00000
2	1,500 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	2066N66	000000