Brass Square-Head Plugs | McMaster-Carr

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Chicago Fire Department

UN/UNF (SAE Straight)

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Acetic Acid (White Vinegar) (10% Concentration)

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Zinc Phosphate Coated

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DFARS Specialty Metals

2,191 Products

Fluid Handling

Pipe Plugs

Insert into the ends of pipe to keep out dirt and debris

598 products

Pipe Caps

Cover the ends of pipe to keep out dirt and debris

67 products

Pipe Fittings

Form threaded, barbed, flanged, and other types of connections between lengths of pipe

4 products

Pipe Flanges

Create an access point in a line by bolting two same-size flanges together with a gasket

2 products

Hose

Flexible and stronger than tubing; often used to convey liquids and gases under pressure

47 products

Hose Fittings

Create threaded, barbed, quick-disconnect, and other types of connections between lengths of hose

196 products

Hose End Caps

Cover the ends of hose to keep out dirt and debris

18 products

Tube and Tube Fittings

Typically more flexible than pipe for carrying liquids and gases in short runs around equipment

165 products

Heat Exchanger Plugs

Plug leaky internal tubes in heat exchangers

17 products

Sights

Observe and monitor the contents of pipes, tanks, and other containers

61 products

Pressure Test Fittings

Create a temporary connection point for gauges and other testing equipment

2 products

Breather Vents

Maintain even pressure and vacuum as temperatures change by allowing airflow in tanks and enclosures

3 products

Building and Machinery Hardware

Protective Plugs

Insert into holes in pipe, containers, panels, and parts to keep out debris

14 products

Grommets

Protect wire, cable, and cords from holes with sharp or rough edges

120 products

Electrical

Electrical Enclosure Plugs

Block or seal holes in outlet boxes and enclosures to keep out debris, dust, and moisture

10 products

Cord Grips

Securely connect cords to enclosures while sealing out dirt and moisture

81 products

Cable Entry Panels

Pass multiple cords into an enclosure while sealing out moisture, dust, and other contaminants

3 products

Binding Posts

Test circuits before making permanent connections

12 products

Safety Equipment

Fire Hydrant Plugs

Pair with a hook-style spanner wrench to quickly seal fire hydrants and washdown equipment

3 products

Fire Hydrant Caps

Pair with a hook-style spanner wrench to quickly cover and uncover fire hydrants

3 products

Lubricating

Grease Fitting Adapters

Mate grease fittings when the sizes and thread types don't match

12 products

Grease Fittings

Create an inlet on equipment and machinery for injecting lubricant; also known as Zerk fittings

26 products

Oil Fittings

Install in engine blocks and other machinery to pour in oil while keeping dust out

1 product

Fastening and Joining

Standoff Caps

Create a finished look on standoffs and protect them from dirt and debris

1 product

Fabric Snaps

Join soft, heavy fabrics such as leather and canvas

39 products

Turn-Button Fastener Bases

Mate with turn-button fastener eyelets to secure fabrics to solid surfaces

6 products

Turn-Button Fastener Eyelets

Pair with turn-button fastener bases to secure fabrics to solid surfaces

3 products

Threaded Inserts

Create new threads or repair stripped threads

466 products

Wood Screws

Fasten material to wood or pieces of wood to each other

4 products

Rivets

Join materials together permanently, especially when too thin or fragile to fasten with screws

5 products

Containers, Storage, and Furniture

Drum Locks

Secure drum lids and openings to prevent tampering

2 products

Facility and Grounds Maintenance

Sink Drains

Empty liquids from sinks into sewer lines

4 products