UL Listed Pipe Caps | McMaster-Carr

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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.

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

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.

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

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	00000000	00000
1 1/4	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	00000000	00000
1 1/2	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	00000000	00000
2	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	00000000	00000
2 1/2	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	00000000	00000
3	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	00000000	00000
4	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	00000000	000000
6	150 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	00000000	000000

Plugs with External Square Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: See table
Specifications Met:
NPT Steel: SAE J531
NPT Iron: ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed
BSPT: ASTM A197, DIN EN 10226
Pipe Nipples and Pipe: Use Schedule 40 steel
Flanges: Use Class 150 galvanized steel

NPT Male
Pipe Size	Plug Construction	Pressure Class	Max. Pressure	Max. Steam Pressure	Material		Each
2 1/2	Hollow	125	125 psi @ 72° F	125 psi @ 350° F	Galvanized Iron	00000000	000000
3	Hollow	125	125 psi @ 72° F	125 psi @ 350° F	Galvanized Iron	00000000	00000
3 1/2	Hollow	125	125 psi @ 72° F	125 psi @ 350° F	Galvanized Iron	00000000	000000
4	Hollow	125	125 psi @ 72° F	125 psi @ 350° F	Galvanized Iron	00000000	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.

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

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	00000000	000000
3/8	2,000 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1/2	2,000 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
3/4	2,000 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1	2,000 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1 1/4	1,500 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1 1/2	1,500 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
2	1,500 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
2 1/2	1,000 psi @ 72° F	300 psi @ 550° F	Iron	00000000	000000
3	1,000 psi @ 72° F	300 psi @ 550° F	Iron	00000000	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	0000000	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	0000000	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	0000000	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	0000000	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	0000000	0000
1 1/2	1"	1,500 psi @ 72° F	300 psi @ 550° F	Steel	ASME B1.20.1, UL Listed	00000000	00000
2	1"	1,500 psi @ 72° F	300 psi @ 550° F	Steel	ASME B1.20.1, UL Listed	00000000	00000

Plugs with External Square 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 steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material	Specifications Met		Each
1/2	Solid	400 psi @ 72° F	300 psi @ 550° F	Iron	ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed	00000000	00000
3/4	Solid	400 psi @ 72° F	300 psi @ 550° F	Iron	ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed	00000000	0000
1	Solid	400 psi @ 72° F	300 psi @ 550° F	Iron	ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed	00000000	0000
1 1/4	Solid	400 psi @ 72° F	300 psi @ 550° F	Iron	ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed	00000000	00000
1 1/2	Solid	400 psi @ 72° F	300 psi @ 550° F	Iron	ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed	00000000	00000
2	Solid	400 psi @ 72° F	300 psi @ 550° F	Iron	ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed	00000000	00000
2 1/2	Solid	400 psi @ 72° F	300 psi @ 550° F	Iron	ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed	00000000	00000

Grooved-End Iron Pipe Fittings

The grooved ends on these fittings connect to pipe with a clamp to easily install piping systems. Since there’s no heat or threading required, they provide quick access to a pipe line for routine maintenance. Fittings are also known as Victaulic fittings. They are for use in noncorrosive applications.

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

Caps

For Use With: Air, Water
Temperature Range: -30° to 250° F
Specifications Met: UL Listed, FM Approved, ASTM A536

Pipe Size	Max. Pressure	Color	Material		Each
2	750 psi @ 72° F	Orange	Enamel-Coated Ductile Iron	0000000	000000
2 1/2	750 psi @ 72° F	Orange	Enamel-Coated Ductile Iron	00000000	00000
3	750 psi @ 72° F	Orange	Enamel-Coated Ductile Iron	0000000	00000
4	750 psi @ 72° F	Orange	Enamel-Coated Ductile Iron	0000000	00000
6	750 psi @ 72° F	Orange	Enamel-Coated Ductile Iron	00000000	000000

45° Flared Fittings for Copper and Brass Tubing

Temperature Range: -65° to 250° F
Tubing: Use with seamless brass and copper that meets ASTM B280

No sleeve is required to assemble these fittings, which makes for a faster, more convenient installation compared to 37° flared fittings. They require a nut (sold separately) for each tube end. Fittings are also known as refrigeration and SAE fittings. They are brass for good corrosion resistance.

Copper tube size is the accepted designation of the copper tubing industry, not the actual tube OD.

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

Caps

For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water;
except caps for 1/8" tube OD are only for use with refrigerant
Specifications Met: See table

For Tube
OD	Wall Thick.	Material	Max. Pressure	Specifications Met		Each
3/16"	0.03"	Brass	1,900 psi @ 72° F	SAE J512, SAE J513, UL Listed	000000000	00000
1/4"	0.03"	Brass	1,400 psi @ 72° F	SAE J512, SAE J513, UL Listed	000000000	0000
5/16"	0.032"	Brass	1,200 psi @ 72° F	SAE J512, SAE J513, UL Listed	000000000	0000
3/8"	0.032"	Brass	1,000 psi @ 72° F	SAE J512, SAE J513, UL Listed	000000000	0000
1/2"	0.032"	Brass	750 psi @ 72° F	SAE J512, SAE J513, UL Listed	000000000	0000
5/8"	0.035"	Brass	650 psi @ 72° F	SAE J512, SAE J513, UL Listed	000000000	0000
3/4"	0.035"	Brass	550 psi @ 72° F	SAE J512, SAE J513, UL Listed	000000000	00000

Plugs

For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water
Specifications Met: SAE J512, SAE J513, UL Listed

For Tube
OD	Wall Thick.	Material	Max. Pressure		Each
1/4"	0.03"	Brass	1,400 psi @ 72° F	000000000	00000
5/16"	0.032"	Brass	1,200 psi @ 72° F	000000000	0000
3/8"	0.032"	Brass	1,000 psi @ 72° F	00000000	0000
1/2"	0.032"	Brass	750 psi @ 72° F	000000000	0000
5/8"	0.035"	Brass	650 psi @ 72° F	000000000	00000

Nuts

(A) Short Nut

(B) Short Nut

(A) Long Nut

For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water; except nuts for 1" tube OD are not for use with fuel oil
Specifications Met: SAE J512, SAE J513, UL Listed; except nuts for 1" tube OD meet SAE J512 and SAE J513 only

	For Tube
	OD	Wall Thick.	Nut Material	Max. Pressure	Lg.		Each
Short Nuts
A	3/16"	0.035"	Brass	1,900 psi @ 72° F	5/8"	000000000	00000
A	1/4"	0.049"	Brass	1,400 psi @ 72° F	3/4"	000000000	0000
A	5/16"	0.049"	Brass	1,200 psi @ 72° F	7/8"	000000000	0000
A	3/8"	0.032"	Brass	1,000 psi @ 72° F	29/32"	000000000	0000
A	3/8"	0.065"	Brass	1,000 psi @ 72° F	1"	000000000	0000
A	1/2"	0.032"	Brass	750 psi @ 72° F	1"	000000000	0000
A	1/2"	0.083"	Brass	750 psi @ 72° F	1 1/8"	000000000	0000
A	5/8"	0.035"	Brass	650 psi @ 72° F	1 1/16"	000000000	00000
A	5/8"	0.095"	Brass	650 psi @ 72° F	1 5/16"	000000000	00000
A	3/4"	0.035"	Brass	550 psi @ 72° F	1 5/32"	000000000	00000
A	3/4"	0.109"	Brass	550 psi @ 72° F	1 1/2"	000000000	00000
B	1/4"	0.03"	Brass	1,400 psi @ 72° F	5/8"	00000000	0000
B	1/2"	0.032"	Brass	750 psi @ 72° F	27/32"	000000000	0000
B	5/8"	0.035"	Brass	650 psi @ 72° F	31/32"	000000000	00000
Long Nuts
A	3/16"	0.035"	Brass	1,900 psi @ 72° F	13/16"	000000000	0000
A	1/4"	0.049"	Brass	1,400 psi @ 72° F	15/16"	000000000	0000
A	5/16"	0.049"	Brass	1,200 psi @ 72° F	1 1/8"	000000000	0000
A	3/8"	0.065"	Brass	1,000 psi @ 72° F	1 5/16"	000000000	0000
A	1/2"	0.083"	Brass	750 psi @ 72° F	1 5/8"	000000000	00000
A	5/8"	0.095"	Brass	650 psi @ 72° F	1 7/8"	000000000	00000
A	3/4"	0.109"	Brass	550 psi @ 72° F	2 3/16"	000000000	00000