Metric Bungs | McMaster-Carr

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Metric

	Thread Size Thread Size

	Thread Type Thread Type	Show

Metric

	Thread Type Thread Type	Hide

UN/UNF (SAE Straight)

UNC

UNF

UNS

	Pipe Size Pipe Size

	Thread Pitch Thread Pitch

	Material Material

	Type Type


Adapter	Connector

Bushing	Reducing Adapter

Nut

	Mount Type Mount Type

	Through Wall

	Gender Gender

Female

Male

	For Use With For Use With

Dichlorotetrafluoroethane

	Connection Style Connection Style

Threaded

	Connection Type Connection Type

	Pipe

	Nut Type Nut Type


Weld	Flange

Hex	Square

	Maximum Pressure Maximum Pressure

	Weld Nut Shape Weld Nut Shape

	Rectangular
	Round
	Hex
	Square
	Rectangular with Floating Nut

	Finish Finish

Nickel Plated

Zinc Plated

Aluminum Plated

	Length Length

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Color Color

	White
	Yellow

	Drum Plug Type Drum Plug Type

Standard

	Height Height

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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86 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.

About Nuts, Materials, and Finishes

High-Pressure Plated Brass Threaded Pipe Fittings

The plating on these brass fittings creates a shiny finish and provides extra protection in corrosive environments. Fittings have the strength to handle high-pressure applications.

Nickel-plated brass fittings provide better corrosion resistance than unplated brass fittings.

Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through a wall or panel to create an inlet or outlet.

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

Through-Wall Straight Adapters

For Use With: Air, Natural Gas, Oil, Water

				Nickel-Plated Brass
Pipe Size	Thread Size	For Max. Wall Thick.	Max. Pressure		Each
BSPP Female × Metric Male
1/8	M16 × 1.5 mm	0.394"	2,170 psi @ 72° F	00000000	00000
1/4	M20 × 1.5 mm	0.63"	1,450 psi @ 72° F	00000000	0000
3/8	M26 × 1.5 mm	0.591"	1,080 psi @ 72° F	00000000	0000
1/2	M28 × 1.5 mm	0.827"	725 psi @ 72° F	00000000	0000
3/4	M33 × 1.5 mm	0.886"	1,230 psi @ 72° F	00000000	00000

Through-Wall Bushing Straight Reducing Adapters

For Use With: Air, Natural Gas, Oil, Water

Thread Size				Nickel-Plated Brass
(A)	(B)	For Max. Wall Thick.	Max. Pressure		Each
Metric Male × Metric Female
M10 × 1 mm	M5 × 0.8 mm	0.276"	1,080 psi @ 72° F	00000000	00000

High-Pressure Brass Threaded Pipe Fittings

These fittings have the strength to handle high-pressure applications. They are brass for good corrosion resistance.

Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through a wall or panel to create an inlet or outlet.

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

Through-Wall Straight Connectors

Exploded View

For Use With:
NPT Threads: Air, Water
BSPP and Metric Threads: Air, Natural Gas, Oil, Water
Specifications Met: See table

Metric Female
Thread Size	For Hole Dia.	For Max. Wall Thick.	Max. Pressure	Specifications Met		Each
M5 × 0.8 mm	7/16"	17/64"	1,000 psi @ 72° F	SAE J530, SAE J531	000000000	000000

Nuts for High-Pressure Nipples for Compressed Gas

Slide a high-pressure hose nipple for compressed gas into one of these nuts to connect a pipe to the inlet of a pressure regulator. They are also known as CGA (Compressed Gas Association) nuts and inlet nuts.

Brass nuts have good corrosion resistance and are softer than 316 stainless steel nuts, so they're easier to thread together. Aluminum-plated brass nuts have better corrosion and wear resistance than unplated brass.

Note: Nuts have a CGA, BS, or DIN number that corresponds to a specific type of gas. Choose a nut with the same number as your tank and other system components.

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

Female

Maximum Pressure: See table
Maximum Temperature: 120° F, except DIN 477 No. 9: 250° F

Aluminum-Plated Brass
Number	Thread Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
DIN 477 No. 6	W 21.8	Metric	Right Hand	3,000 psi @ 72° F	Argon, Carbon Dioxide, Cyclobutane, Dichlorotetrafluoroethane, Helium, Krypton, Sulfur Hexafluoride, Trifluoroethane, Xenon	000000000	000000

Threaded Round Plugs for Straight-Thread Pipe

Seal tube and hose fittings to keep their straight threads protected from contaminants during fabrication and storage.

Nylon plugs resist chemicals better than aluminum plugs and are more wear resistant than polyethylene plugs. You can install them manually or with a hex-head wrench or socket.

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

Nylon with External Hex Drive

Nylon

Thread
Size	Pitch, mm	Ht., mm	Max. Temp., °F	Hardness	Color	Pkg. Qty.		Pkg.
M10	1	7	150°	Durometer 55D	Yellow	50	0000000	000000
M12	1.5	10	150°	Durometer 55D	Yellow	50	0000000	00000
M14	1.5	10	150°	Durometer 55D	Yellow	50	0000000	00000
M16	1.5	10	150°	Durometer 55D	Yellow	50	0000000	00000
M18	1.5	10	150°	Durometer 55D	Yellow	50	0000000	00000
M20	1.5	10	150°	Durometer 55D	Yellow	25	0000000	00000
M22	1.5	10	150°	Durometer 55D	Yellow	25	0000000	00000
M24	1.5	12	150°	Durometer 55D	Yellow	25	0000000	00000
M26	1.5	10	150°	Durometer 55D	Yellow	10	0000000	00000
M27	2	13	150°	Durometer 55D	Yellow	10	0000000	00000
M33	2	13	150°	Durometer 55D	Yellow	10	0000000	00000

Drum Plugs

For installation and removal of these plugs, use drum-plug wrenches.

Style D have a M64 thread size, which is also known as Buttress threads.

Drum-plug caps (sold separately) fit over drum plugs to provide dust protection as well as evidence of tampering. They have a breakaway seal and are for one-time use.

Polyethylene Plastic

Drum Plugs											Crimp-On Drum Plug Caps			Crimping Tools for Drum Plug Caps
Style	Drum Plug Type	Color	Seal Material	Pipe/Thread Size	Gender	Max. Temp., °F	Features	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.		Each
D	Standard	White	EPDM Rubber	M64 Metric	Male	125°	3/4 NPSM Faucet Knockout	5	0000000	000000	10	0000000	000000	0000000	0000000

Polypropylene Plastic

Drum Plugs										Crimp-On Drum Plug Caps			Crimping Tools for Drum Plug Caps
Style	Drum Plug Type	Color	Pipe/Thread Size	Gender	Max. Temp., °F	Features	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.		Each
D	Standard	White	M64 Metric	Male	125°	3/4 NPSM Faucet Knockout	5	0000000	000000	10	0000000	000000	0000000	0000000

Metric Steel Hex Weld Nuts

You can weld these nuts to flat and uneven uncoated steel surfaces for a strong permanent hold. A collar pilot assists alignment and prevents welding spatter from getting into threads.

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

Thread				Collar
Size	Pitch, mm	Wd., mm	Ht., mm	Dia., mm	Ht., mm	For Hole Dia., mm	Specifications Met	Pkg. Qty.		Pkg.
Steel
M3	0.5	7.5	2.45	4.5	0.55	4.5	DIN 929	100	000000000	000000
M4	0.7	9	2.85	6	0.65	6	DIN 929	100	000000000	00000
M5	0.8	10	3.3	7	0.7	7	DIN 929	100	000000000	00000
M6	1	11	4.25	8	0.75	8	DIN 929	50	000000000	0000
M8	1.25	14	5.6	10.5	0.9	10.5	DIN 929	50	000000000	00000
M10	1.5	17	6.85	12.5	1.15	12.5	DIN 929	25	000000000	00000
M12	1.75	19	8.6	14.8	1.4	14.8	DIN 929	25	000000000	00000
M14	2	22	9.2	16.8	1.8	16.8	DIN 929	10	000000000	0000
M16	2	24	11.2	18.8	1.8	18.8	DIN 929	10	000000000	00000

Metric Steel Narrow-Base Weld Nuts

A long barrel provides secure thread engagement. Weld these nuts to flat, uncoated steel surfaces for a strong, permanent hold. They can be used in channels and tight spaces where round-base weld nuts won't fit.

Zinc-plated steel weld nuts resist corrosion in wet environments.

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

Thread		Base			Barrel
Size	Pitch, mm	Lg., mm	Wd., mm	Thick., mm	Dia., mm	Ht., mm	Pkg. Qty.		Pkg.
Zinc-Plated Steel
M5	0.8	19.1	12.7	1	6.2	7.9	50	000000000	000000
Steel
M6	1	19.1	12.7	1.2	7.7	7.9	50	000000000	00000
M6	1	19.1	12.7	1.2	7.7	11.1	50	000000000	00000
M6	1	19.1	12.7	1.2	7.7	14.3	50	000000000	00000
M8	1.25	22.2	14.3	1.4	9.5	9.5	25	000000000	00000
M8	1.25	22.2	14.3	1.4	9.5	15.9	25	000000000	00000
M10	1.5	25.4	15.9	1.6	11.5	11.1	25	000000000	00000

Metric Stainless Steel Hex Weld Nuts

You can weld these nuts to flat and uneven uncoated stainless steel surfaces for a strong permanent hold. They have a collar pilot that assists alignment and prevents welding spatter from getting into threads.

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

Thread				Collar
Size	Pitch, mm	Wd., mm	Ht., mm	Dia., mm	Ht., mm	For Hole Dia., mm	Specifications Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel
M3	0.5	7.5	2.5	4.5	0.55	4.5	DIN 929	100	000000000	000000
M4	0.7	9	2.9	6	0.65	6	DIN 929	50	000000000	0000
M5	0.8	10	3.3	7	0.7	7	DIN 929	50	000000000	00000
M6	1	11	4.3	8	0.75	8	DIN 929	25	000000000	0000
M8	1.25	14	5.6	10.5	0.9	10.5	DIN 929	25	000000000	00000
M10	1.5	17	6.9	12.5	1.15	12.5	DIN 929	10	000000000	0000
M12	1.75	19	8.6	14.8	1.4	14.8	DIN 929	10	000000000	00000
M16	2	24	11.2	18.8	1.8	18.8	DIN 929	1	000000000	00000

Stainless Steel Offset-Barrel Narrow-Base Weld Nuts

These weld nuts have an offset barrel so you can position threads near corners. Weld them to flat uncoated steel surfaces for a strong permanent hold. They can be used in channels and tight spaces where round-base weld nuts won't fit.

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

Metric

Thread		Base			Barrel
Size	Pitch, mm	Lg.	Wd., mm	Thick., mm	Dia.	Ht., mm	For Hole Dia., mm	Pkg. Qty.		Pkg.
18-8 Stainless Steel
M4	0.7	15.9	9.6	2.4	5.2	0.8	5.6	10	000000000	000000
M5	0.8	15.9	9.6	2.4	6	0.8	6.4	10	000000000	00000
M6	1	20.6	12.9	3.2	7.6	1.3	8	10	000000000	00000

Low-Profile Narrow-Base Weld Nuts

Use these weld nuts in low-clearance applications and in tight spaces where round-base weld nuts won't fit. Weld them to flat and uneven uncoated steel surfaces for a strong permanent hold.

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

Metric

Thread		Base			Barrel
Size	Pitch, mm	Lg., mm	Wd., mm	Thick., mm	Dia., mm	Ht., mm	For Hole Dia., mm	Pkg. Qty.		Pkg.
Steel
M4	0.7	22	11	2.4	5.2	0.8	5.6	10	000000000	000000
M6	1	28.5	13	3.2	7.6	1.2	8	10	000000000	00000
M8	1.25	38	16	3.6	9.2	2	9.6	10	000000000	00000
M10	1.5	38	16	3.6	11.8	2.4	12.2	10	000000000	00000

Low-Profile Narrow-Base Weld Nuts with Projections

Projections concentrate the weld and provide room for heat to dissipate. Weld them to flat stainless steel surfaces for a strong permanent hold. They can be used in channels and tight spaces where round-base weld nuts won't fit.

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

Metric

Thread		Base			Barrel
Size	Pitch, mm	Lg., mm	Wd., mm	Thick., mm	Dia., mm	Ht., mm	For Hole Dia., mm	No. of Projections	Pkg. Qty.		Pkg.
18-8 Stainless Steel
M4	0.7	16	9.6	2.4	5.2	0.8	5.2	2	10	000000000	00000
M5	0.8	16	9.6	2.4	6	0.8	6	2	10	000000000	00000
M6	1	20.5	13	3.2	7.6	1.2	7.6	2	10	000000000	00000
M8	1.25	25	16	3.6	9.2	2	9.2	2	5	000000000	00000

Steel Offset-Barrel Narrow-Base Weld Nuts

An offset barrel allows you to position threads near corners. Weld them to flat uncoated steel surfaces for a strong permanent hold. They can be used in channels and tight spaces where round-base weld nuts won't fit.

Zinc-plated steel weld nuts resist corrosion in wet environments.

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

Metric

Thread		Base			Barrel
Size	Pitch, mm	Lg., mm	Wd., mm	Thick., mm	Dia., mm	Ht., mm	For Hole Dia., mm	Pkg. Qty.		Pkg.
Zinc-Plated Steel
M3.5	0.6	16	11	2.4	4.8	0.8	4.9	10	000000000	00000
M4	0.7	16	11	2.4	5.2	0.8	5.3	10	000000000	0000
M5	0.8	16	11	2.4	6	0.8	6.1	10	000000000	0000
M6	1	20.5	13	3.2	7.6	1.2	7.7	10	000000000	0000
M8	1.25	25	16	3.6	9.2	2	9.3	10	000000000	0000
M10	1.5	28.5	16	3.6	11.8	2.4	11.9	10	000000000	0000
Steel
M3.5	0.6	16	11	2.4	4.8	0.8	4.9	10	000000000	0000
M4	0.7	16	11	2.4	5.2	0.8	5.3	10	000000000	0000
M5	0.8	16	11	2.4	6	0.8	6.1	10	000000000	0000
M6	1	20.5	13	3.2	7.6	1.2	7.7	10	000000000	0000
M8	1.25	25	16	3.6	9.2	2	9.3	10	000000000	0000
M10	1.5	28.5	16	3.6	11.8	2.4	11.9	10	000000000	0000

Metric Steel Round-Base Weld Nuts

These weld nuts have a smooth base that provides more contact with the mating surface than weld nuts with projections. The base also acts as a flange to distribute the load. A long barrel ensures secure thread engagement.

Zinc-plated steel weld nuts are corrosion resistant in wet environments.

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

Thread		Base		Barrel
Size	Pitch, mm	Dia., mm	Thick., mm	Dia., mm	Ht., mm	Pkg. Qty.		Pkg.
Zinc-Plated Steel
M4	0.7	18	0.8	5.3	6.3	50	000000000	000000
M5	0.8	19.1	1	6.2	7.9	50	000000000	00000
Steel
M6	1	19.1	1.2	7.7	7.9	100	000000000	00000
M6	1	19.1	1.2	7.7	11.1	100	000000000	00000
M6	1	19.1	1.2	7.7	14.3	100	000000000	00000
M8	1.25	22.2	1.4	9.4	9.5	50	000000000	00000
M8	1.25	22.2	1.4	9.4	15.9	50	000000000	00000
M10	1.5	25.4	1.6	11.5	11.1	50	000000000	00000

Square Weld Nuts

Square weld nuts have more weld points than hex weld nuts for a stronger hold. Weld them on flat uncoated steel surfaces. All have a collar pilot that assists alignment and prevents welding spatter from getting into threads.

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

Metric

Thread
Size	Pitch, mm	Wd., mm	Ht., mm	For Hole Dia., mm	Specifications Met	Pkg. Qty.		Pkg.
Steel
M4	0.7	7	2.9	6.4	DIN 928	50	000000000	000000
M5	0.8	9	3.4	8.2	DIN 928	100	000000000	00000
M6	1	10	4.2	9.1	DIN 928	100	000000000	00000
M8	1.25	14	5.5	12.8	DIN 928	100	000000000	00000
M10	1.5	17	6.8	15.6	DIN 928	25	000000000	0000
M12	1.75	19	8.1	17.4	DIN 928	25	000000000	00000

Metric Aligning Weld Nuts

Threads float inside the retainer so you can install a bolt at a slight angle to align with off-center parts. Weld these nuts to uncoated steel for a strong permanent hold or punch holes in the flanges and secure them with rivets. The retainer is made from C1008-C1010 steel.

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

Thread		Base
Size	Pitch, mm	Lg., mm	Wd., mm	Thick., mm	Ht., mm	Pkg. Qty.		Pkg.
Steel Nut with C1008/C1010 Steel Retainer
M6	1	38.1	12.7	1.06	8.6	10	000000000	000000
M8	1.25	50.8	19.8	1.27	13.7	5	000000000	00000