Metal Caps | McMaster-Carr

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5,749 Products

Fluid Handling

Pipe Caps

Cover the ends of pipe to keep out dirt and debris

303 products

Pipe Plugs

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

765 products

Pipe Flanges

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

877 products

Tube End Caps

Cover the ends of tube to keep out dirt and debris

253 products

Tube End Plugs

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

83 products

Tube Fittings

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

30 products

Hose End Caps

Cover the ends of hose to keep out dirt and debris

23 products

Hose Fittings

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

803 products

Hose

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

14 products

Sights

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

116 products

Breather Vents

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

1 product

Strainers

Install next to valves and pumps to catch debris in your line

18 products

Building and Machinery Hardware

Protective Caps

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

42 products

Protective Plugs

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

123 products

Knobs

Position, tighten, and secure fixtures and equipment

113 products

Strut Channel Framing and Fittings

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

45 products

Press-Fit Framing and Fittings

Set up temporary partitions, guards, and displays using only a hammer

1 product

Lockouts

Ensure that machines stay turned off to prevent accidents during maintenance work

4 products

Leveling Mount Inserts

Slip onto equipment and furniture to add threaded-stud leveling feet

12 products

Fastening and Joining

Cap Nuts

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

338 products

Retaining Rings

Hold components on a shaft

293 products

Quick-Release Pin Receptacles

Secure quick-release pins when you don’t have a through hole

35 products

Quick-Release Pin Retaining Caps

Hold quick-release pins in holes that are oversized or out of round

23 products

Standoff Caps

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

2 products

Press-Fit Nuts

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

2 products

Threaded Inserts

Create new threads or repair stripped threads

1 product

Electrical

Electrical Enclosure Plugs

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

39 products

Electrical Enclosure Drains

Release moisture to keep components dry

2 products

Outlet Box Covers

Enclose wiring for outlets and switches or block off unused components

43 products

Electrical Connector Caps

Protect data connectors when not in use

10 products

Terminal Covers

Block out dirt and corrosion to protect battery terminals

2 products

Containers, Storage, and Furniture

Drum Plugs

Seal drum lid openings

9 products

Drum Covers

Protect drum lids from damage and rust

2 products

Gas Tank Safety Caps

Protect valves on high-pressure gas tanks without having to remove the regulator

1 product

Gas Tank Safety Collars

Protect valves on acetylene tanks without having to remove the regulator

1 product

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

6 products

Hard Hat Racks

Keep hard hats close at hand, but out of the way

4 products

Lubricating

Grease Fittings

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

330 products

Grease Fitting Adapters

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

29 products

Grease Fitting Junction Blocks

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

9 products

Grease Fitting Repair Tools

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

2 products

Grease Fitting Installation Tools

Tap to insert grease fittings in unthreaded holes

2 products

Grease Fitting Cleaning Tools

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

2 products

Heating, Ventilation, and Air Conditioning

Duct and Duct Fittings

Circulate air through HVAC systems using round, rectangular, and fabric duct

129 products

Chimney Pipe and Fittings

Exhaust hot air and fumes from boilers, furnaces, and stoves

12 products

Power Transmission

Die Spring Screw Caps

Brace springs and control tension in die sets while simplifying maintenance

10 products

Fabricating and Machining

Fixture Plate Plugs

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

1 product

Facility and Grounds Maintenance

Faucet Hole Covers

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

1 product

Sink Drain Strainers

Catch debris to prevent clogs and plug drains to fill sinks

6 products

Sink Drains

Empty liquids from sinks into sewer lines

15 products

Fence Posts

Secure and hold up fencing

7 products