Square Plugs | McMaster-Carr

Clear All

	Drive Style Drive Style


External Square	Square

	For Shape For Shape


Round	Square

Rectangle

	Material Material

	Pipe Size Pipe Size

	Thread Type Thread Type

BSPT

NPT

NPTF

	Type Type

	Plug

	For Pipe Material For Pipe Material

	For Use With For Use With

Wire, Cable, and Cords

	System of Measurement System of Measurement

Inch

Metric

	For Inside Width For Inside Width

	Head Width Head Width

	Shape Shape


Cap/Plug	Domed

Rectangle	Round

Square	Tapered Square

	Class Class

	Maximum Pressure Maximum Pressure

	Plug Construction Plug Construction

Solid

Hollow

Solid with Magnet

	Plug Type Plug Type


Push In	Screw In

Snap In

	Gender Gender

Male

	Connection Style Connection Style

Threaded

	For Pipe Schedule For Pipe Schedule


40	80

160

	Head Length Head Length

	Color Color

	Beige		Black
	Blue		Brown
	Clear		Gray
	Green		Pink
	Red		White
	Yellow

	For Inside Length For Inside Length

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

DFARS Specialty Metals
COTS-Exempt

	Body Shape Body Shape

	Square

View catalog pages (67)

Forward

Enter e-mail addresses in the fields below

From

Message

Link

Cancel

How can we improve?

Comments

E-mail address (if you would like a response)

Cancel

607 Products

Metal Pipe and Pipe Fittings

Compact Extreme-Pressure
Steel Threaded Pipe Fittings

These fittings are strong enough to handle extreme pressures, yet small enough to fit into cramped spaces.

Low-Pressure Iron and Steel Threaded Pipe Fittings

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

Low-Pressure Cast Iron Threaded Pipe Fittings

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.

Low-Pressure Galvanized Steel
Threaded Pipe Fittings with Sealant

The male threads on these fittings have a sealant applied for extra leak protection.

High-Pressure Iron and Steel Threaded Pipe Fittings

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

Medium-Pressure Iron and Steel Threaded Pipe Fittings

For use in noncorrosive environments, these fittings have better strength than our low-pressure iron and steel pipe fittings.

Low-Pressure Stainless Steel Threaded Pipe Fittings

Use these corrosion-resistant fittings in a low-pressure pipe line.

Low-Pressure Stainless Steel
Threaded Pipe Fittings with Sealant

The male threads on these fittings have a sealant applied for extra leak protection.

High-Pressure Stainless Steel Threaded Pipe Fittings

Use these heavy duty, corrosion-resistant fittings in high-pressure flow applications.

High-Pressure Brass Threaded Pipe Fittings

These brass fittings have the strength to handle high-pressure applications.

High-Pressure Brass Threaded
Pipe Fittings with Sealant

Not only do these brass fittings have the strength to handle high-pressure applications, the male threads have a sealant applied for extra protection against leaks.

Low-Pressure Brass and Bronze Threaded Pipe Fittings

Use these fittings in low-pressure flow applications. They have good corrosion resistance.

Low-Pressure Brass Threaded
Pipe Fittings with Sealant

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

Low-Pressure Plated Brass Threaded Pipe Fittings

Used in low-pressure pipe lines, these brass fittings have a plating that makes them shiny and improves corrosion resistance.

Extreme-Pressure Brass Threaded Pipe Fittings

Extreme pressures are no problem for these heavy-duty brass fittings.

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.

Medium-Pressure Aluminum Threaded Pipe Fittings

Designed for medium-pressure applications, these fittings have better strength than our low-pressure aluminum pipe fittings.

High-Pressure Aluminum Threaded Pipe Fittings

Also known as Class 3000 fittings, these have the highest pressure rating of all the aluminum pipe fittings we offer.

Titanium Threaded Pipe Fittings

Titanium has similar strength to steel, but is approximately 40% lighter. It has better corrosion resistance than most stainless steel alloys and can handle corrosive substances, such as salt water and acids.

Plastic Pipe and Pipe Fittings

Drain, Waste, and Vent ABS Pipe Fittings for Chemicals

These fittings are an economical option for chemical waste systems. Fittings are ABS plastic, which has excellent strength and impact resistance and good chemical resistance.

Aboveground Standard-Wall PVC Pipe
Fittings for Drain, Waste, and Vent

These Schedule 40 fittings are the industry standard for gravity-flow drain, waste, and vent (DWV) applications.

Underground PVC Pipe Fittings
for Drain, Waste, and Vent

With thinner walls than Schedule 40 fittings, these are lighter in weight and have more space on the inside for high-flow applications, such as underground gravity-flow sewer and storm drainage lines. They are also known as SDR 35 fittings.

Plugs

Threaded Round Plugs for NPT Pipe

Protect internally threaded NPT connections from contaminants during fabrication and storage.

High-Temperature Round Plugs for NPT Pipe

These plugs withstand temperatures up to 600° F to protect internally threaded NPT connections from contaminants during electropainting, paint baking, and powder coating applications.

Snap-In Square Plugs

Flexible ridges or straps hold these plugs in place.

Push-In Square Plugs

Push these plugs into an opening and friction holds them in place.

Metal Square Plugs

More durable than plastic plugs, these provide the most protection from abrasion and impact. Use them to eliminate sharp edges and create a finished look on metal fence and machine-guard posts. Drive them in place with a hammer for a secure fit.

Domed Square Plugs

Often used on metal furniture, these plugs provide a finished look on posts and tubes. Snap them into place and their flexible ridges will provide a secure grip.

Caps

Square Caps

Slide these flexible vinyl caps on and they conform for a snug fit.

Heavy Duty Square Caps

Made of rigid plastic, these caps are more wear resistant than vinyl caps but not as flexible.

Heat-Shrink Round Caps

Permanently seal pipe, tubing, conduit, and even crimped electrical connections. Slide these flexible caps on and use a heat gun to tightly shrink them to the shape of whatever they are covering. Their outer surface shrinks while the inner wall flows into voids to create a sealed connection.

Stretchable Elastic Caps

Similar to a shower cap, these caps have an elastic band that allows them to stretch and cover a variety of shapes in a range of sizes.

Stacking Caps and Targets

Weld these caps and targets to the ends of posts to create stackable shelving and racking systems.

Electrical

Ready-to-Use Steel Outlet Boxes

These boxes come ready to use with receptacles and/or light switches installed.

Enclosure-Mount Aluminum
Power and Data Outlet Boxes

Mount these boxes to the outside of an enclosure to access a programmable logic controller or other networked device without opening the enclosure.

Data Keystone Wall Plates

Create various data connector configurations by choosing adapters to snap into the ports in these wall plates.

Clip-On EMI/RFI Suppressors for Cable

Clip these suppressors—also known as ferrite beads and ferrite chokes—around data, USB, video, and sensitive-equipment cable to curb electromagnetic and radio frequency interference.

Bumpers, Grommets, and Trim

Liquid-Tight Sealing Grommets

Rated IP68, these grommets form liquid-tight seals around wire, cable, and cords to protect them against dust as well as submersion in a maximum of one meter of water.

Furniture Grommets

Eliminate clutter on desktops, countertops, benchtops, and other work surfaces by organizing wire, cable, and cords.

Brush-Style Furniture Grommets

Wire, cable, and cords pass through the grommet opening while the bristles fill in the gaps to control dust and debris. Use these grommets to eliminate cord clutter on desktops, countertops, benchtops, and other work surfaces.

Bumper Assortments

Keep bumpers of various shapes, materials, and mounting styles on hand to solve whatever problems arise.

Bumpers for Tubing and Rods

With a split design, you can easily place these bumpers on tubing, rods, machinery legs, control shafts, and levers to protect them from impact, dents, and scratches. Use the concealed screw to secure them in place.

Sealing Screws for Softwood and Plastic-Wood Composites

Sealing Screws for Softwood
and Plastic-Wood Composites

The neoprene-backed washer seals out contaminants.