Square Drive Plugs | McMaster-Carr

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	Pipe Size Pipe Size

	Thread Type Thread Type

BSPT

NPT

NPTF

	Drive Style Drive Style	Show

Square

	Drive Style Drive Style	Hide

Tamper-Resistant Torx

	Type Type

	Plug

	Material Material

	For Pipe Material For Pipe Material

Steel

Aluminum

Brass

	For Use With For Use With

	Shape Shape

	Cap/Plug

	System of Measurement System of Measurement

Inch

	Length Length

	Connection Style Connection Style

Threaded

	Plug Construction Plug Construction

Solid

Hollow

	For Pipe Schedule For Pipe Schedule

	40

	Gender Gender

Male

	Maximum Pressure Maximum Pressure

	Pressure Class Pressure Class

125

150

	Connection Type Connection Type

	Pipe

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

DFARS Specialty Metals
COTS-Exempt

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

RoHS Compliant

RoHS Compliant with
Exemptions

	Finish Finish

Black Coated

Galvanized

	Specifications Met Specifications Met

	Maximum Steam Pressure Maximum Steam Pressure

125 psi @ 350° F

150 psi @ 350° F

150 psi @ 360° F

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

REACH Compliant

	Environment Environment

Food and Beverage

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67 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 Tapping Screws

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.

Plugs with Square Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Presure 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
1/8	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	00000
1/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	000
3/8	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	000
1/2	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	000
3/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	000
1	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	0000
1 1/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	0000
1 1/2	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	00000
2	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	00000
2 1/2	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
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

Low-Pressure Cast Iron Threaded Pipe Fittings

Made of cast iron, these fittings are brittle and can be quickly opened with the strike of a sledge hammer in case of an emergency. 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: ASME B16.14, ASME B16.4, ASTM A126, ASME B1.20.1
Pipe Nipples and Pipe: Use Schedule 40 steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material		Each
1	Solid	125 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
1 1/4	Solid	125 psi @ 72° F	125 psi @ 350° F	Iron	000000000	0000
1 1/2	Solid	125 psi @ 72° F	125 psi @ 350° F	Iron	000000000	0000
2	Solid	125 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
2 1/2	Solid	125 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
3	Solid	125 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
4	Solid	125 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.

Plugs with Square Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 150
Specifications Met: SAE J531
Pipe Nipples and Pipe: Use Schedule 40 steel
Flanges: Use Class 150 galvanized steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material		Each
1/8	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	00000
1/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	000
3/8	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	000
1/2	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	000
3/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	000
1	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	0000
1 1/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	0000
1 1/2	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	00000
2	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	00000

Low-Pressure Galvanized Steel Threaded Pipe Fittings with Sealant

The male threads on these fittings have a sealant applied for extra leak protection. Fittings are made of galvanized steel, which has fair corrosion resistance. Also known as Pressure Class 150 fittings, they are for use in low-pressure applications.

NPTF (Dryseal) threads are compatible with NPT threads.

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: 150
Specifications Met: SAE J531
Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
Flanges: Use Class 150 galvanized steel

NPTF Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure		Each
1/8	Solid	150 psi @ 72° F	150 psi @ 360° F	0000000	00000
1/4	Solid	150 psi @ 72° F	150 psi @ 360° F	0000000	000
3/8	Solid	150 psi @ 72° F	150 psi @ 360° F	0000000	000
1/2	Solid	150 psi @ 72° F	150 psi @ 360° F	0000000	000
3/4	Solid	150 psi @ 72° F	150 psi @ 360° F	0000000	000
1	Solid	150 psi @ 72° F	150 psi @ 360° F	0000000	0000

Low-Pressure Brass and Bronze Threaded Pipe Fittings

Use these fittings in low-pressure flow applications. They have good corrosion resistance. Fittings rated for use with drinking water meet NSF/ANSI 61 safety standards.

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

Plugs with Square Drive

For Use With: Air, Drinking Water, Natural Gas, Oil
Pressure Class : 125
Specifications Met:
NPT: ASME B1.20.1, ASME B16.15, NSF/ANSI 61
BSPT: ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61
Pipe Nipples and Pipe: Use Schedule 40 brass
Flanges: Use Class 150 brass

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Material		Each
1/2	Solid	200 psi @ 72° F	Brass	00000000	000000
3/4	Solid	200 psi @ 72° F	Brass	00000000	00000
1	Solid	200 psi @ 72° F	Brass	00000000	00000
1 1/4	Solid	200 psi @ 72° F	Brass	00000000	00000
1 1/2	Solid	200 psi @ 72° F	Brass	00000000	00000
2	Solid	200 psi @ 72° F	Brass	00000000	00000
2 1/2	Solid	200 psi @ 72° F	Brass	00000000	000000
3	Solid	200 psi @ 72° F	Brass	00000000	000000
4	Solid	200 psi @ 72° F	Brass	00000000	000000
BSPT Male
3/4	Solid	200 psi @ 72° F	Brass	00000000	00000
1	Solid	200 psi @ 72° F	Brass	00000000	00000
1 1/2	Solid	200 psi @ 72° F	Brass	00000000	00000
2	Solid	200 psi @ 72° F	Brass	00000000	00000

Low-Pressure Brass Threaded Pipe Fittings with Sealant

The male threads on these fittings have a sealant applied for extra protection against leaks. Also known as Pressure Class 125 fittings, they are built for use in low-pressure applications. They are brass for good corrosion resistance.

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

Plugs with Square Drive

For Use With: Air, Natural Gas, Oil, Water
Pressure Class: 125
Specifications Met: ASME B1.20.1, ASME B16.15
Pipe Nipples and Pipe: Use Schedule 40 brass
Flanges: Use Class 150 brass

NPT Male
Pipe Size	Plug Construction	Max. Pressure		Each
1/2	Solid	200 psi @ 72° F	0000000	000000
3/4	Solid	200 psi @ 72° F	0000000	00000
1	Solid	200 psi @ 72° F	0000000	00000
1 1/2	Solid	200 psi @ 72° F	0000000	00000
2	Solid	200 psi @ 72° F	0000000	00000

Low-Pressure Aluminum Threaded Pipe Fittings

In addition to being lightweight, these aluminum fittings offer good corrosion resistance. Use them in low-pressure flow applications. To prevent cracking, do not tighten more than a 1/4-turn past hand tight.

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

Plugs with Square Drive

For Use With: Air, Oil, Water
Pressure Class: 150
Pipe Nipples and Pipe: Use Schedule 40 aluminum
Flanges: Use Class 125 aluminum

NPT Male
Pipe Size	Plug Construction	Max. Pressure		Each
3/8	Solid	150 psi @ 72° F	000000000	00000
1/2	Solid	150 psi @ 72° F	000000000	0000
3/4	Solid	150 psi @ 72° F	000000000	0000
1	Solid	150 psi @ 72° F	000000000	0000
1 1/4	Solid	150 psi @ 72° F	000000000	00000
1 1/2	Solid	150 psi @ 72° F	000000000	00000
2	Solid	150 psi @ 72° F	000000000	00000
2 1/2	Solid	150 psi @ 72° F	000000000	00000
3	Solid	150 psi @ 72° F	000000000	00000
4	Solid	150 psi @ 72° F	000000000	00000

Sealing Screws for Softwood and Plastic-Wood Composites

The neoprene-backed washer seals out contaminants. Also known as trim-head deck screws, they have a small flat head and slender shank to reduce the risk of splitting. They have a Type 17 auger point to penetrate softwood and plastic-wood composite decking material. Made from 18-8 stainless steel, they have good chemical resistance and are a good choice for ACQ-treated (arsenic-free) lumber. Screws may be mildly magnetic. Length is measured from the top of the head.

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

	Head		Washer
Lg.	Dia.	Ht.	OD	Thick.	Drive Size	Drill Bit Size	Approximate Threads per Inch	Threading	Min. Thread Lg.	Pkg. Qty.		Pkg.
18-8 Stainless Steel
No. 7
1"	0.23"	0.125"	0.63"	0.2"	No. 1	1/16"	16	Partially Threaded	7/8"	25	000000000	000000
1 5/8"	0.23"	0.125"	0.63"	0.2"	No. 1	1/16"	16	Partially Threaded	1 1/8"	25	000000000	00000
2 1/4"	0.23"	0.125"	0.63"	0.2"	No. 1	1/16"	16	Partially Threaded	1 1/4"	10	000000000	00000
3"	0.23"	0.125"	0.63"	0.2"	No. 1	1/16"	16	Partially Threaded	2"	10	000000000	00000