Steel Plugs | McMaster-Carr

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4,055 Products

Fluid Handling

Pipe Plugs

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

392 products

Pipe Caps

Cover the ends of pipe to keep out dirt and debris

101 products

Pipe Flanges

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

54 products

Tube End Plugs

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

22 products

Tube End Caps

Cover the ends of tube to keep out dirt and debris

56 products

Tube End Cap and Plug Kits

Cover or insert into the ends of tube fittings to keep out dirt and debris

2 products

Tube Fittings

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

1 product

Hose Fittings

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

332 products

Hose End Caps

Cover the ends of hose to keep out dirt and debris

5 products

Sights

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

46 products

Bore Sealing Plug Installation Tools

Set sealing plugs into unthreaded holes in pneumatic and hydraulic components

18 products

Pressure Test Fittings

Create a temporary connection point for gauges and other testing equipment

2 products

Building and Machinery Hardware

Protective Plugs

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

103 products

Protective Caps

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

22 products

Strut Channel Framing and Fittings

Secure fittings in the U-shaped channel to route conduit and pipe or build other structures

24 products

Electrical

Electrical Enclosure Plugs

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

27 products

Outlet Boxes

House electrical components such as on-off switches, receptacles, and dimmer knobs

32 products

Cord Grips

Securely connect cords to enclosures while sealing out dirt and moisture

57 products

Cable Entry Panels

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

4 products

Wire and Cable Crimpers

Crimp connectors onto electrical wire or cable

56 products

Wire Stripper Crimpers

Strip wire and crimp connectors with one tool

8 products

Wire and Cable Crimper Dies

Attach to cordless crimpers to secure connectors onto cable

63 products

Outlet Strips

Plug in multiple devices to power them from a single outlet

34 products

Battery Chargers

Charge everything from large-cell to cordless tool to household batteries

1 product

Fabricating and Machining

Fixture Plate Plugs

Keep chips and shavings from clogging or damaging unused holes on fixture plates in milling machines

1 product

Plug Cutters

Form wood plugs to conceal fastener heads in counterbored holes

8 products

Lubricating

Grease Fittings

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

257 products

Grease Fitting Adapters

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

24 products

Grease Fitting Junction Blocks

Send different types and amounts of grease from multiple grease fittings to lubricate several points

6 products

Grease Fitting Repair Tools

Remove and repair broken or clogged grease fittings and re-tap threaded holes

2 products

Grease Fitting Cleaning Tools

Flush out old grease, dirt, and debris from clogged fittings

1 product

Grease Fitting Installation Tools

Tap to insert grease fittings in unthreaded holes

2 products

Oil Fittings

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

28 products

Measuring and Inspecting

Hose Coupling Size-Identification Kits

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

1 product

Threaded Hole Location Gauges

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

70 products

Plug Gauges

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

1,027 products

Fastening and Joining

Threaded Inserts

Create new threads or repair stripped threads

675 products

Press-Fit Nuts

Push into drilled or punched holes to add threads to thin panels

2 products

Retaining Rings

Hold components on a shaft

9 products

Standoff Caps

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

1 product

Rivets

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

2 products

Tapping Screws

Fasten a range of materials together without needing to tap the hole first

77 products

Fabric Snaps

Complete snaps that join fabric together or fasten fabric to surfaces

2 products

Drum Plug Wrenches

Install and remove screw-in drum plugs; also known as bung wrenches

4 products

Containers, Storage, and Furniture

Drum Plugs

Seal drum lid openings

5 products

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

6 products

Facility and Grounds Maintenance

Faucet Hole Covers

Close off unused faucet holes intended for soap dispensers and side sprayers

1 product