Black Iron Pipe Fitting Plugs

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	Type Type


Plug	Cap

Adapter	Bushing

Connector	Flange

Outlet	Reducer

Reducing Adapter	Union

	Pipe Size Pipe Size

2
2 1/2
3
3 1/2
4
5
10
12

	Thread Type Thread Type

NPT

BSPT

	Material Material

Iron

Steel

	Drive Style Drive Style


External Square	External Hex

Hex	Square

	For Use With For Use With

	Class Class

	Maximum Pressure Maximum Pressure

	Connection Style Connection Style

	Body Shape Body Shape


Square	Hex

	Shape Shape

	Cap/Plug
	Straight
	Tee

	For Pipe Schedule For Pipe Schedule


40	80

160

	Gender Gender

Male

Female

	Specifications Met Specifications Met

ANSI/ASME

ASTM

DIN

MSS

	Plug Construction Plug Construction

Solid

Hollow

	Maximum Steam Pressure Maximum Steam Pressure

	Length Length

	Dash Size Dash Size

	Flanged Connection Surface Flanged Connection Surface


Raised	Flat

	Drive Size Drive Size

	Flange OD Flange OD

	Bolt Circle Diameter Bolt Circle Diameter

	Number of Bolt Holes Number of Bolt Holes

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98 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.

High-Pressure Iron and Steel Threaded Pipe Fittings

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

Union connectors separate into three pieces so you can access your line without unthreading pipe connections.

Tee outlets allow you to create a threaded outlet anywhere along a pipe. They are also known as branch connectors and are comparable to Thredolet. To install, drill a hole in your pipe to match the fitting’s pipe size and weld in place.

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

Union Straight Connectors

Exploded View

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Class: 3000
Specifications Met: ASTM A105, ANSI/ASME B1.20.1, MSS SP-83
Pipe Nipples and Pipe: Use Schedule 160 steel
Flanges: Use Class 1500 steel

NPT Female
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	Material		Each
1 1/2	24	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	0000000	000000
2	32	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	0000000	00000

Bushing Straight Reducing Adapters

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

Pipe Size		Dash Size
(A)	(B)	(A)	(B)	Max. Pressure	Max. Steam Pressure	Material		Each
NPT Male × NPT Female
1/4	1/8	04	02	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	00000
3/8	1/8	06	02	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000
3/8	1/4	06	04	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000
1/2	1/4	08	04	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000
1/2	3/8	08	06	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000
3/4	3/8	12	06	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000
3/4	1/2	12	08	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000
1	1/2	16	08	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000
1	3/4	16	12	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000
1 1/4	1/2	20	08	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000
1 1/4	1	20	16	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000
1 1/2	1 1/4	24	20	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000
2	1/4	32	04	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	00000
2	1	32	16	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	00000
3	1/4	48	04	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	00000
3	1/2	48	08	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	00000
3	3/4	48	12	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	00000
4	1	64	16	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	000000
4	2	64	32	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	00000

Straight Reducers

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

Pipe Size		Dash Size
(A)	(B)	(A)	(B)	Max. Pressure	Max. Steam Pressure	Material		Each
NPT Female
1/2	1/8	08	02	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	00000
1	3/8	16	06	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000
1 1/4	3/4	20	12	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	00000
3	1 1/4	48	20	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	00000
4	2 1/2	64	40	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	000000

Tee Outlets

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Specifications Met : ANSI/ASME B31.3, ANSI/ASME B31.1, ASTM A105, MSS SP-97, ANSI/ASME B16.9, ANSI/ASME B16.11
Pipe Nipples and Pipe: Use Schedule 160 steel
Flanges: Use Class 1500 steel

NPT Female × Butt Weld
Pipe Size	Dash Size	For Pipe Size	Construction	Max. Pressure	Max. Steam Pressure	Material		Each
1/4	04	1/2 to 36	Seamless	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	0000000	00000
3/8	06	1 1/4 to 36	Seamless	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	0000000	0000
1/2	08	3/4 to 36	Seamless	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	0000000	0000
3/4	12	1 1/2 to 36	Seamless	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	0000000	0000
1	16	3 to 36	Seamless	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	0000000	0000
1 1/4	20	4 to 36	Seamless	3,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	0000000	00000

Plugs with External Hex Drive

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

NPT Male
Pipe Size	Dash Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material		Each
3/8	06	Solid	6,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	00000
1/2	08	Solid	6,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000
3/4	12	Solid	6,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000
1	16	Solid	6,000 psi @ 72° F	300 psi @ 360° F	Black-Coated Steel	00000000	0000

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
Class: 300
Specifications Met: ANSI/ASME B16.3, UL Listed, ASTM A197, ANSI/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	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	000000
3/8	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1/2	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
3/4	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1 1/4	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1 1/2	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
2	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
2 1/2	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
3	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000

Plugs with Hex Drive

For Use With: Air, Natural Gas, Oil, Steam, Water
Class: 300
Specifications Met: ANSI/ASME B1.20.1, UL Listed
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		Each
1 1/4	3/4"	300 psi @ 72° F	300 psi @ 550° F	Steel	00000000	00000
1 1/2	1"	300 psi @ 72° F	300 psi @ 550° F	Steel	00000000	00000
2	1"	300 psi @ 72° F	300 psi @ 550° F	Steel	00000000	00000

Plugs with External Square Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Class: 300
Specifications Met: ANSI/ASME B16.14, ASTM A126, UL Listed, ANSI/ASME B1.20.1
Pipe Nipples and Pipe: Use Schedule 80 steel
Flanges: Use Class 300 or 600 steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material		Each
1/2	Solid	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
3/4	Solid	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	0000
1	Solid	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	0000
1 1/4	Solid	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	0000
1 1/2	Solid	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	0000
2	Solid	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000

Low-Pressure Iron and Steel Threaded Pipe Fittings

Use these fittings for low-pressure applications 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
Class: 150
Specifications Met:
NPT: ANSI/ASME B1.20.1, ANSI/ASME B16.3
BSPT: DIN EN 10226
Pipe Nipples and Pipe: Use Schedule 40 steel

BSPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/4	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	00000
3/8	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1/2	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
3/4	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1 1/4	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1 1/2	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
2	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
2 1/2	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	0000000	00000

Plugs with Square Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Class:
Steel: 150
Iron: 125
Pipe Nipples and Pipe: Use Schedule 40 steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material		Each
2 1/2	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	000000
3	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
3 1/2	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
4	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	000000

Plugs with External Square Drive

For Use With:
NPT and BSPT: Air, Natural Gas, Oil, Steam, Water
NPTF: Air, Natural Gas, Steam, Water
Class:
NPT Steel: 125
NPT Iron and BSPT: 150
Specifications Met:
BSPT: DIN EN 10226
Pipe Nipples and Pipe:
NPT and BPST: Use Schedule 40 steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material		Each
2 1/2	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	000000
3	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
3 1/2	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
4	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
BSPT Male
1/4	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
3/8	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1/2	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
3/4	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1 1/4	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1 1/2	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
2	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
2 1/2	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	0000000	00000

High-Pressure Steel Unthreaded Pipe Flanges

Forged for extra strength, these heavy duty flanges can withstand high-pressure applications. Bolt two flat-surface flanges or two raised-surface flanges of the same size together with a gasket (sold separately) to create an access point in a pipe line.

Butt-weld flanges are also known as weld-neck flanges; the flange neck has a beveled end that, when flush to pipe, creates a trough for a strong weld.

Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides.

Socket-connect flanges have an internal stop that supports the pipe when welding and prevents the pipe from sliding all the way through.

Stub-end flanges are also known as lap-joint flanges; use them with a stub-end straight adapter (not included). The stub-end straight adapter slides into the flange and welds to pipe (not the flange). Since the flange isn’t welded to the pipe, it can be disconnected easily for frequent cleaning and inspecting.

Cap flanges are also known as blind flanges.

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

Butt-Weld Flanges

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Class: See table
Specifications Met: ASTM A105, ANSI/ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 80 steel
Fittings: Use Class 3000 and Schedule 80 steel

					Bolt Hole
Pipe Size	Dash Size	Wall Thick.	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
300 Class
1 1/4	20	0.191"	5 1/4"	5/8"	3/4"	4	3 7/8"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	000000
1 1/2	24	0.2"	6 1/8"	3/4"	7/8"	4	4 1/2"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	00000
12	__	0.688"	20 1/2"	1 1/4"	1 1/4"	16	17 3/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	000000
600 Class
1 1/2	24	0.2"	6.12"	0.88"	0.88"	4	4 1/2"	1,400 psi @ 72° F	1,300 psi @ 300° F	Black-Coated Steel	00000000	00000

Slip-On Weld Flanges

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Class: See table
Specifications Met: ASTM A105, ANSI/ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 80 steel
Fittings: Use Class 3000 and Schedule 80 steel

				Bolt Hole
Pipe Size	Dash Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
300 Class
3	48	8 1/4"	3/4"	7/8"	8	6 5/8"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	000000
4	64	10"	3/4"	7/8"	8	7 7/8"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	00000

Socket-Connect Flanges

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Class: See table
Specifications Met: See table
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 80 steel
Fittings: Use Class 3000 and Schedule 80 steel

				Bolt Hole
Pipe Size	Dash Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material	Specifications Met		Each
300 Class
3/4	12	4 5/8"	5/8"	3/4"	4	3 1/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	ANSI/ASME B16.5, ASTM A105	00000000	000000
5	__	11"	3/4"	7/8"	8	9 1/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	ANSI/ASME B16.5, ASTM A105	00000000	000000
600 Class
1 1/2	24	6.12"	0.88"	0.88"	4	4 1/2"	1,400 psi @ 72° F	1,300 psi @ 300° F	Black-Coated Steel	ANSI/ASME B16.5, ASTM A105	00000000	00000
4	64	10 3/4"	1"	1"	8	8 1/2"	Not Rated	Not Rated	Black-Coated Steel	ASTM A105	00000000	000000

Stub-End Flanges

Stub-End Flange (Front)

Flat Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Class: See table
Specifications Met: ASTM A105, ANSI/ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 80 steel
Fittings: Use Class 3000 and Schedule 80 steel

				Bolt Hole
Pipe Size	Dash Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
300 Class
1/2	08	3 3/4"	1/2"	5/8"	4	2 5/8"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	000000
2	32	6 1/2"	5/8"	3/4"	8	5"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	00000
3	48	8 1/4"	3/4"	7/8"	8	6 5/8"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	00000
10	__	17 1/2"	1.12"	1.12"	16	15 1/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	000000

Caps

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Class: See table
Specifications Met: ASTM A105, ANSI/ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 80 steel
Fittings: Use Class 3000 and Schedule 80 steel

				Bolt Hole
Pipe Size	Dash Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
300 Class
1 1/4	20	5 1/4"	5/8"	3/4"	4	3 7/8"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	000000
10	__	17 1/2"	1.12"	1.12"	16	15 1/4"	600 psi @ 72° F	300 psi @ 300° F	Black-Coated Steel	00000000	000000
600 Class
2	32	6 1/2"	3/4"	3/4"	8	5"	1,400 psi @ 72° F	1,300 psi @ 300° F	Black-Coated Steel	00000000	00000

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