Threaded Plugs | McMaster-Carr

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10,237 Products

Most Likely Products

Pipe Plugs

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

1,553 products

Protective Plugs

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

179 products

Electrical Enclosure Plugs

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

29 products

All Results

Fluid Handling

Pipe Plugs

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

1,553 products

Pipe Caps

Cover the ends of pipe to keep out dirt and debris

376 products

Pipe Straights

Join lengths of pipe to send contents in one direction

1,012 products

Pipe Bushings

Connect two pipes of different diameters

99 products

Pipe

Join with fittings and additional lengths of pipe

82 products

Pipe Elbows

Change the direction of flow when joining lengths of pipe

151 products

Pipe Tees

Split or merge liquid flow paths

135 products

Pipe Unions

Separate into three pieces so you can access your line without unthreading pipe connections

Bolt together with a gasket to create an access point within a line

5 products

Pipe Wyes

Split or merge liquid flow more gradually than tees

29 products

Pipe Traps

Create a seal that prevents the backflow of gas

6 products

Tube Fittings

Make threaded, push to connect, barbed, and other types of connections between lengths of tube

126 products

Hose Fittings

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

883 products

Breather Vents

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

93 products

Pressure Test Fittings

Create a temporary connection point for gauges and other testing equipment

31 products

Pressure-Relief Valves

Protect equipment by opening at a set pressure and closing when the pressure drops; for repeated use

17 products

Sights

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

172 products

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

5 products

Building and Machinery Hardware

Protective Plugs

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

179 products

Protective Caps

Protect just about anything, including pipe, flanges, screws, and posts

40 products

Electrical Power, Networking, and Controlling

Electrical Enclosure Plugs

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

29 products

Safety Equipment

Fire Hydrant Caps

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

6 products

Fire Hydrant Plugs

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

3 products

Fastening and Joining

Threaded Inserts

Create new threads or repair stripped threads

3,625 products

Standoff Caps

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

66 products

Cap Nuts

Cover and protect threads while adding a finished look; also known as acorn nuts

13 products

Threaded Insert Installation Tools

Install helical, key-locking, slotted-drive, and other threaded inserts

739 products

Measuring and Inspecting

Plug Gauges

Verify the diameter or threads of machined holes in finished parts; also called pin gauges

547 products

Threaded Hole Location Gauges

Pinpoint the true center of threaded holes to precisely align and measure parts

70 products

Hose Coupling Size-Identification Kits

Match your hose coupling to one of the plugs to determine its size without measuring

1 product

Lubricating

Grease Fittings

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

323 products

Grease Fitting Adapters

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

41 products

Oil Fittings

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

17 products

Grease Fitting Installation Tools

Tap to insert grease fittings in unthreaded holes

2 products

Containers, Storage, and Furniture

Drum Plugs

Seal drum lid openings

27 products

Drum Plug Caps

Access inside drums to fill them

4 products

Drum Locks

Secure drum lids and openings to prevent tampering

1 product

Material Handling

Valve Stem Caps

Keep dust and debris out of tire valves

2 products

Sealing

Drum Plug Gaskets

Form a tighter seal in drum openings than with a drum plug alone

7 products