Plugs for Argon | McMaster-Carr

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	Type Type


Adapter	Cap

Flange	Plug

	Pipe Size Pipe Size

1/8
1/4
3/8
1/2
3/4
1
2
2 1/2
3
4

	Thread Type Thread Type

BSPT

Metric

NPT

	Material Material

Brass

Stainless Steel

Steel

	Drive Style Drive Style


Hex	External Hex

	System of Measurement System of Measurement

Inch

Metric

	Drive Size Drive Size

	For Use With For Use With	Show

Argon

	For Use With For Use With	Hide

Warning: Products have one, but not necessarily all, of the selected characteristics.

Alcohol-Based Solvents

Hydrochloric Acid (30%)

Wire, Cable, and Cords

	Maximum Pressure Maximum Pressure

	Shape Shape

	Cap/Plug
	Straight

	Length Length

	Gender Gender

Male

Female

	Connection Style Connection Style

Threaded

Flanged

Gasket

	Body Shape Body Shape

	Hex

	Connection Type Connection Type


Pipe	Tube

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Specifications Met Specifications Met

ASME

DIN

ISO

	Maximum Steam Pressure Maximum Steam Pressure

1,500 psi @ 300° F

	Plug Construction Plug Construction

Hollow

	Fabrication Fabrication

Machined

	Thread Fabrication Thread Fabrication

Rolled

	Thread Size Thread Size

M16

	Gasket Material Gasket Material

Fluoroelastomer Rubber

Polyurethane Rubber

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58 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.

Precision Extreme-Pressure Brass Threaded Pipe Fittings

Also known as instrumentation fittings, these have the most precise threads and the tightest tolerances of all the brass pipe fittings we offer. The male threads are rolled for excellent strength in extreme-pressure applications. Fittings are brass for good corrosion resistance.

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

Caps

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure		Each
1/8	4,000 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
1/4	4,300 psi @ 72° F	1,500 psi @ 300° F	00000000	0000
3/8	3,500 psi @ 72° F	1,500 psi @ 300° F	00000000	0000
1/2	3,600 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
3/4	3,000 psi @ 72° F	1,500 psi @ 300° F	00000000	00000

Plugs with Hex Drive

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3

NPT Male
Pipe Size	Drive Size	Max. Pressure	Max. Steam Pressure		Each
1/8	3/16"	5,600 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
1/4	1/4"	4,100 psi @ 72° F	1,500 psi @ 300° F	00000000	0000
3/8	5/16"	4,000 psi @ 72° F	1,500 psi @ 300° F	00000000	00000

Plugs with External Hex Drive

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met:
NPT: ASME B1.20.1, ASME B31.1, ASME B31.3
BSPT: ASME B31.3, DIN 2999, ISO 7.1

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure		Each
1/8	Hollow	5,600 psi @ 72° F	1,500 psi @ 300° F	0000000	00000
1/4	Hollow	4,100 psi @ 72° F	1,500 psi @ 300° F	0000000	0000
3/8	Hollow	4,000 psi @ 72° F	1,500 psi @ 300° F	0000000	0000
1/2	Hollow	3,900 psi @ 72° F	1,500 psi @ 300° F	0000000	0000
3/4	Hollow	3,800 psi @ 72° F	1,500 psi @ 300° F	0000000	00000
BSPT Male
1/8	Hollow	3,200 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
1/4	Hollow	3,300 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
3/8	Hollow	2,600 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
1/2	Hollow	2,400 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
3/4	Hollow	2,300 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
1	Hollow	2,200 psi @ 72° F	1,500 psi @ 300° F	00000000	00000

Brass and Bronze Unthreaded Pipe Flanges

Bolt these flanges to equipment or to another same-size, flat-surface flange with a gasket (sold separately). They have good corrosion resistance.

Cap flanges are also known as blind flanges.

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

Caps

Front

Flat Surface on Back

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Water
Class: 150
Specifications Met: ASME B16.24
Pipe Nipples and Pipe: Use Schedule 40 brass

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Material		Each
2	6"	1/2"	3/4"	4	4 3/4"	225 psi @ 72° F	Brass	00000000	0000000
2 1/2	7"	1/2"	3/4"	4	5 1/2"	225 psi @ 72° F	Brass	00000000	000000
3	7 1/2"	1/2"	3/4"	4	6"	225 psi @ 72° F	Brass	00000000	000000
4	9"	1/2"	3/4"	8	7 1/2"	225 psi @ 72° F	Brass	00000000	000000

Ultra-High-Polish Gasket Fittings for Stainless Steel Tubing

For Use With: Argon, Helium, Nitrogen
Temperature Range: -420° to 1000° F
Tubing: Use with 316/316L stainless steel
Compatible With: Swagelok® VCR

The 15 Ra finish on the interior of these fittings creates an ultra-smooth surface. Also known as ultra-high-purity fittings, they are packed in a Class 100 clean room to prevent contamination. They are commonly used in semiconductor applications. Fittings use a metal gasket (sold separately), which generates fewer particles than a rubber gasket and creates a strong seal in high-pressure and high-vacuum applications. Fittings are 316 stainless steel for excellent corrosion resistance.

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

Caps

For Tube OD	Material	Max. Pressure	Max. Vacuum		Each
1/4"	316L Stainless Steel	5,100 psi @ 72° F	10 ^-11 torr @ 72° F	0000000	000000
1/2"	316L Stainless Steel	3,500 psi @ 72° F	10 ^-11 torr @ 72° F	0000000	00000

Plugs

For Tube OD	Material	Max. Pressure	Max. Vacuum		Each
1/4"	316L Stainless Steel	5,100 psi @ 72° F	10 ^-11 torr @ 72° F	0000000	000000
1/2"	316L Stainless Steel	3,500 psi @ 72° F	10 ^-11 torr @ 72° F	0000000	00000

Nuts

Female

Use a female nut to connect a threaded adapter or a Yor-Lok adapter with a butt-weld adapter.

				Female
For Tube OD	Nut Material	Max. Pressure	Max. Vacuum		Each
1/4"	316L Stainless Steel	5,100 psi @ 72° F	10 ^-11 torr @ 72° F	0000000	00000
1/2"	316L Stainless Steel	3,500 psi @ 72° F	10 ^-11 torr @ 72° F	0000000	00000

Gaskets

For Tube OD	Gasket Material	Max. Vacuum		Each
1/4"	316L Stainless Steel	10 ^-11 torr @ 72° F	0000000	00000
1/2"	316L Stainless Steel	10 ^-11 torr @ 72° F	0000000	0000

Pressure Test Fittings

Steel

Check pressure without permanently installing a gauge. Fittings have an NPT male connection for installation in your pipe or tank. Wrench-tighten the fitting onto your equipment, then insert the gauge adapter (sold separately) into the fitting. Connect gauge adapters to gauges with 1/4 pipe size NPT male threads.

Plugs									Gauge Adapters
Pipe Size	Thread Size	Thread Pitch, mm	Max. Pressure, psi	Gasket Material	Ht.	For Use With		Each		Each
NPT Male × Metric Male
Steel
1/8	M16	2	5,800	Fluoroelastomer Rubber	1 1/2"	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Water	0000000	000000	0000000	000000
1/4	M16	2	5,800	Fluoroelastomer Rubber	1 1/2"	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Water	0000000	00000	0000000	00000

Quick-Install Pressure Test Fittings

NPT Female Inlet ×
NPT Male
Outlet Adapter

NPT Female Inlet × NPT
Male Outlet Adapter with
Intermittent Swivel

NPT Male Inlet ×
NPT Female
Outlet Adapter

NPT Male Inlet Plug

Thread these fittings onto your testing equipment by hand for a secure connection in testing applications—no tools, tape, or sealant required. Use them with gauges and other equipment as a temporary connection. When pressure is applied, the O-ring on the outlet presses against the testing equipment, creating a tight seal.

Adapters with intermittent swivel rotate 360° until tightened for easy installation.

NPT Female Inlet × NPT Male Outlet Adapter
Pipe Size	Max. Pressure, psi	Temperature Range, °F	Gasket Material	For Use With		Each
416 Stainless Steel
1/8 × 1/8	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1/4 × 1/4	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	00000
3/8 × 3/8	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1/2 × 1/2	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
3/4 × 3/4	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1 × 1	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
NPT Female Inlet × NPT Male Outlet Adapter with Intermittent Swivel
416 Stainless Steel
1/8 × 1/8	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1/4 × 1/4	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
3/8 × 3/8	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1/2 × 1/2	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
3/4 × 3/4	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1 × 1	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
NPT Male Inlet × NPT Female Outlet Adapter
416 Stainless Steel
1/8 × 1/8	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	00000
1/4 × 1/4	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	00000
3/8 × 3/8	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1/2 × 1/2	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
3/4 × 3/4	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1 × 1	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
NPT Male Inlet Plug
416 Stainless Steel
1/8	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	00000
1/4	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	00000
3/8	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	00000
1/2	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
3/4	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000