Aluminum Caps | McMaster-Carr

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1,185 Products

Fluid Handling

Hose End Caps

Cover the ends of hose to keep out dirt and debris

58 products

Hose Fittings

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

72 products

Hose End Plugs

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

3 products

Pipe and Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases

174 products

Tube Fittings

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

10 products

Bore Sealing Plugs

Permanently seal unthreaded holes in pneumatic and hydraulic components

43 products

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

4 products

Sights

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

20 products

Breather Vents

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

4 products

Building and Machinery Hardware

Protective Caps

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

32 products

Protective Plugs

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

25 products

Knobs

Position, tighten, and secure fixtures and equipment

69 products

Slip-On Framing Caps

Cover the rough ends of slip-on framing rails for a finished look

9 products

T-Slotted Framing and Fittings

The most versatile system, attach fittings along the continuous slots to build virtually anything

2 products

Strut Channel Covers

Close off the channel to create a raceway for cable or add a finished look

2 products

Door Drip Guards

Divert rain and snow away from door openings

10 products

Electrical Power, Networking, and Controlling

Metric Circular Connector Caps

Keep metric circular connectors safe when they're not in use

4 products

Mini Connector Caps

Shield mini connectors when they're not in use

5 products

Mil. Spec. Connector Caps

Protect Mil. Spec. connectors when they're not in use

12 products

Latching Connectors

Protect connections in wet or harsh environments while keeping them accessible

34 products

Mil. Spec. Connectors

Meet strict military standards or are compatible with Mil. Spec. connectors

71 products

Power Connectors

Plugs, sockets, receptacles, and other connectors for powering equipment

20 products

Audio Plugs

Pair with sockets or receptacles to make audio connections

2 products

RJ45 Plugs

Pair with sockets or receptacles to make Ethernet connections

1 product

Wire Splices, Connectors, and Taps

Join wire and protect the connection

87 products

Electrical Enclosure Plugs

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

6 products

Weatherheads

Bring power into buildings and protect the entry point from rain and snow

10 products

Electrical Enclosure Vents

Attach to sealed enclosures so air can flow to equalize temperature and pressure

5 products

Outlet Boxes

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

5 products

Outlet Box Covers

Enclose wiring for outlets and switches or block off unused components

25 products

Containers, Storage, and Furniture

Fuel Caps

Seal fuel tanks on trailers, compressors, and other equipment

2 products

Heating, Ventilation, and Air Conditioning

Chimney Vent Caps

Cover chimneys to reduce downdrafts and block out debris

9 products

Duct Vent Caps

Reduce downdrafts and prevent obstructions from entering vents

4 products

Fastening and Joining

Standoff Caps

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

1 product

Press-Fit Nuts

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

2 products

Cap Nuts

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

6 products

Safety Equipment

Fire Hydrant Caps

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

1 product

Toe and Foot Guards

Slip over shoes or boots to shield feet and toes from impact

6 products

Facility and Grounds Maintenance

Chain Link Fencing

Everything you need to build or repair a chain link fence, from posts to gates

5 products

Fabricating and Machining

Vise Jaw Liners

Place over vise jaws to protect workpieces from marring

38 products

Sanding Bits

Smooth out small, recessed, and hard-to-reach areas, and also remove paint and rust

186 products

Fixture Plate Plugs

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

2 products

Lubricating

Grease Fitting Manifolds

Lubricate multiple points with the same amount and type of grease using one grease fitting

3 products