Steel Weld Bungs | McMaster-Carr

Clear All

	Pipe Size Pipe Size

	Thread Type Thread Type

NPT

NPTF

NPSC

	Material Material

Steel

	Finish Finish

Zinc-Phosphate Coated

Galvanized

	Pressure Class Pressure Class

3000

6000

	For Pipe Material For Pipe Material	Show

Steel

	For Pipe Material For Pipe Material	Hide

Stainless Steel

Steel

Aluminum

	Connection Style Connection Style

Threaded

Butt Weld

Socket Connect

	For Use With For Use With

	System of Measurement System of Measurement

Inch

	Length Length

	For Pipe Schedule For Pipe Schedule


40	80

160	XXH

	Specifications Met Specifications Met

ASTM

ASME

	Maximum Pressure Maximum Pressure

3,000 psi @ 72° F

6,000 psi @ 72° F

Not Rated

	Wall Thickness Wall Thickness

	Dash Size Dash Size

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

DFARS Specialty Metals
COTS-Exempt

	Maximum Steam Pressure Maximum Steam Pressure

300 psi @ 360° F

Not Rated

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

REACH Compliant

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

RoHS Compliant

	Fabrication Fabrication

Forged

	Construction Construction

Seamless

	For Tank Surface For Tank Surface

Curved

	For Hole Diameter For Hole Diameter

45 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.

Low-Pressure Iron and Steel Threaded Pipe Fittings

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

Adapters for tanks create an inlet or outlet connection on the surface of any tank, pressure vessel, or drum. Adapters with weld end allow for a permanent connection.

NPTF (Dryseal) threads, NPSC (National Pipe Straight Coupling) threads, and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.

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

Straight Adapters for Curved Tanks

For Use With: Diesel Fuel, Gasoline, Oil, Water
Pipe Nipples and Pipe: Use Schedule 40 steel

NPTF Female × Weld
Pipe Size	For Hole Dia.	For Tank OD	OD	Lg.	Material		Each
3/4	1 1/8"	20"	2 3/16"	7/16"	Steel	0000000	00000
NPSC Female × Weld
1 1/4	1 11/16"	36"	2 13/16"	1/2"	Steel	0000000	0000
1 1/2	1 15/16"	36"	3 1/4"	1/2"	Steel	0000000	0000
2	2 7/16"	26 1/2"	3 11/16"	5/8"	Steel	0000000	0000

High-Pressure Iron and Steel Threaded Pipe Fittings

These fittings can stand up to high-pressure applications. Use them in noncorrosive environments.

Threaded female x butt weld straight adapters are also known as half couplings.

Phosphate-coated and zinc-phosphate-coated fittings offer some corrosion resistance, but aren't intended for corrosive environments.

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

Straight Adapters

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: 3000
Specifications Met: ASME B16.11, ASTM A105, ASME B1.20.1
Pipe Nipples and Pipe: Use Schedule 160 steel
Flanges: Use Class 1500 steel

NPT Female × Butt Weld
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/8	02	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	00000
1/4	04	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	0000
3/8	06	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	0000
1/2	08	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	0000
3/4	12	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	0000
1	16	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	0000
1 1/4	20	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	0000
1 1/2	24	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	00000
2	32	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	00000
2 1/2	40	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	00000
3	48	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	00000
4	64	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	000000

High-Pressure Galvanized Steel Threaded Pipe Fittings

A galvanized finish gives these fittings better corrosion resistance than our plain steel high-pressure fittings. Also known as Pressure Class 3000 fittings, they have excellent strength to handle high-pressure applications.

Threaded female x butt weld straight adapters are also known as half couplings.

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

Straight Adapters

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: 3000
Specifications Met: ASME B1.20.1, ASME B16.11, ASTM A105, ASTM B633
Pipe Nipples and Pipe: Use Schedule 160 steel

NPT Female × Butt Weld
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure		Each
1/8	02	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
1/4	04	3,000 psi @ 72° F	300 psi @ 360° F	00000000	0000
3/8	06	3,000 psi @ 72° F	300 psi @ 360° F	00000000	0000
1/2	08	3,000 psi @ 72° F	300 psi @ 360° F	00000000	0000
3/4	12	3,000 psi @ 72° F	300 psi @ 360° F	00000000	0000
1	16	3,000 psi @ 72° F	300 psi @ 360° F	00000000	0000
1 1/4	20	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
1 1/2	24	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
2	32	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000

Extreme-Pressure Steel Threaded Pipe Fittings

The strongest steel fittings we offer, these can withstand extreme-pressure applications.

Threaded female x butt weld straight adapters are also known as half couplings.

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

Straight Adapters

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class : 6000
Specifications Met: ASME B1.20.1, ASME B16.11, ASTM A105
Pipe Nipples and Pipe: Use Schedule XXH steel
Flanges: Use Class 1500 steel

NPT Female × Butt Weld
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/4	04	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
3/8	06	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	0000
1/2	08	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	0000
3/4	12	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	0000
1	16	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	0000
1 1/4	20	6,000 psi @ 72° F	300 psi @ 360° F	Steel	000000000	00000
1 1/2	24	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
2	32	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000

High-Pressure Socket-Connect Steel Unthreaded Pipe Fittings

Socket-connect fittings are easier to weld than butt-weld fittings because the fitting doesn’t need to align perfectly to the pipe. Slide pipe into the socket and weld for a strong, permanent connection. Fittings have heavy duty construction that stands up to high-pressure applications. They are for use in noncorrosive environments.

Socket connect x butt weld straight adapters are also known as half couplings.

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

Straight Adapters

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class : 3000
Specifications Met: ASTM A105, ASME B16.11
Pipe Nipples and Pipe: Use Schedule 80 steel
Flanges: Use Class 300 and 600 steel

Socket Connect Female × Butt Weld
Pipe Size	Wall Thick.	Construction	Max. Pressure	Max. Steam Pressure	Material		Each
1/8	0.255"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	000000
1/4	0.335"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	00000
3/8	0.301"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	00000
1/2	0.33"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	0000
3/4	0.355"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	0000
1	0.396"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	0000
1 1/4	0.45"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	00000
1 1/2	0.46"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	00000
2	0.48"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	00000
2 1/2	0.608"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	000000
3	0.651"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	000000
4	0.765"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	000000