Metal Caps | McMaster-Carr

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8,439 Products

Fluid Handling

Pipe Caps

Cover the ends of pipe to keep out dirt and debris

Pipe Plugs

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

Pipe Flanges

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

Tube End Caps

Cover the ends of tube to keep out dirt and debris

Tube End Plugs

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

Tube Fittings

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

Tubing Flow Stops

Tubing Flow Stops

Temporarily block water flow to make soldering repairs without waiting for your line to drain

Hose End Caps

Cover the ends of hose to keep out dirt and debris

Hose Fittings

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

Hose

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

Expansion Plugs

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

Air Vent Valves

Air Vent Valves

Eliminate air pockets from fluid lines to maintain consistent flow and prevent surges

Bore Sealing Plugs

Bore Sealing Plugs

Permanently seal unthreaded holes in pneumatic and hydraulic components

Breather Vents

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

Pressure-Relief Valves

Pressure-Relief Valves

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

Sights

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

Heat Exchanger Plugs

Heat Exchanger Plugs

Plug leaky internal tubes in heat exchangers

Building and Machinery Hardware

Protective Caps

Protective Caps

Cover holes at the end of pipe, conduit, and fittings to keep out debris

Protective Plugs

Protective Plugs

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

Knobs

Position, tighten, and secure fixtures and equipment

T-Slotted Framing and Fittings

T-Slotted Framing and Fittings

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

Slip-On Framing and Fittings

Slip-On Framing and Fittings

Insert rails into fittings and tighten screws to make guards, railings, and racks

Press-Fit Framing and Fittings

Press-Fit Framing and Fittings

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

Strut Channel Framing and Fittings

Strut Channel Framing and Fittings

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

Leveling Mount Inserts

Leveling Mount Inserts

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

Protective Feet

Protective Feet

Add to furniture and light equipment to protect floors from scratches and wear

Door Drip Guards

Door Drip Guards

Divert rain and snow away from door openings

Fastening and Joining

Cap Nuts

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

Retaining Rings

Retaining Rings

Hold components on a shaft

Standoff Caps

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

Quick-Release Pin Receptacles

Quick-Release Pin Receptacles

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

Quick-Release Pin Retaining Caps

Quick-Release Pin Retaining Caps

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

Press-Fit Nuts

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

Electrical

Electrical Enclosure Plugs

Electrical Enclosure Plugs

Cover unused holes in enclosures to keep out dust, dirt, and moisture

Electrical Enclosure Drains

Electrical Enclosure Drains

Release moisture to keep components dry

Outlet Box Covers

Outlet Box Covers

Enclose wiring for outlets and switches or block off unused components

Outlet Boxes

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

Weatherheads

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

Electrical Connector Caps

Electrical Connector Caps

Protect data connectors when not in use

Electrical Connectors and Cords

Electrical Connectors and Cords

Supply power to equipment by combining plugs, sockets, receptacles, and cords

Terminal Covers

Terminal Covers

Block out dirt and corrosion to protect battery terminals

Containers, Storage, and Furniture

Drum-Plug Caps

Access inside drums to fill them

Drum Plugs

Seal drum lid openings

Drum Lids

Replace the lid on your drum

Drum Covers

Protect drum lids from damage and rust

Drum Locks

Secure drum lids and openings to prevent tampering

Fuel Caps

Seal fuel tanks on trailers, compressors, and other equipment

Gas Tank Safety Caps

Gas Tank Safety Caps

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

Gas Tank Safety Collars

Gas Tank Safety Collars

Protect valves on acetylene tanks without having to remove the regulator

Stacking Caps and Targets

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

Hard Hat Racks

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

Heating, Ventilation, and Air Conditioning

Duct and Duct Fittings

Duct and Duct Fittings

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

Chimney Pipe and Fittings

Chimney Pipe and Fittings

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

Air Conditioner Service Valves

Air Conditioner Service Valves

Tap into refrigerant lines to drain and fill your system

Safety Equipment

Fire Hydrant Caps

Fire Hydrant Caps

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

Fire Hydrant Plugs

Fire Hydrant Plugs

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

Toe and Foot Guards

Toe and Foot Guards

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

Lubricating

Grease Fitting Adapters

Grease Fitting Adapters

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

Grease Fittings

Grease Fittings

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

Grease Fitting Repair Tools

Grease Fitting Repair Tools

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

Grease Fitting Junction Blocks

Grease Fitting Junction Blocks

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

Grease Fitting Manifolds

Grease Fitting Manifolds

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

Grease Fitting Installation Tools

Grease Fitting Installation Tools

Tap to insert grease fittings in unthreaded holes

Grease Fitting Cleaning Tools

Grease Fitting Cleaning Tools

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

Power Transmission

Die Spring Screw Caps

Die Spring Screw Caps

Brace springs and control tension in die sets while simplifying maintenance

Fabricating and Machining

Fixture Plate Plugs

Fixture Plate Plugs

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

Sanding Bits

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

Vise Jaw Liners

Vise Jaw Liners

Place over vise jaws to protect workpieces from marring

Material Handling

Valve Stem Caps

Valve Stem Caps

Keep dust and debris out of tire valves

Facility and Grounds Maintenance

Chain Link Fencing

Chain Link Fencing

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

Fence Posts

Secure and hold up fencing

Sink Drain Strainers

Sink Drain Strainers

Catch debris to prevent clogs and plug drains to fill sinks

Sink Drains

Empty liquids from sinks into sewer lines

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)