Hole Covers | McMaster-Carr

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5,752 Products

Building and Machinery Hardware

Protective Plugs

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

1,011 products

Protective Caps

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

1,045 products

Grommets

Protect wire, cable, and cords from holes with sharp or rough edges

9 products

T-Slotted Framing and Fittings

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

129 products

Clamp-On Framing and Fittings

Two-piece fittings let you modify assembly stations, conveyors, and racks without dismantling them

1 product

Bolt-Together Framing and Fittings

Fasten through equally spaced holes to build and adjust guards, tables, and racks

1 product

Locking-Slotted Framing and Fittings

Make platforms, bases, and other structures that stand up to more movement than T-slotted framing

1 product

Strut Channel Framing and Fittings

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

111 products

Slip-On Framing and Fittings

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

25 products

Press-Fit Framing and Fittings

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

2 products

Electrical

Electrical Enclosure Plugs

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

77 products

Electrical Enclosure Drain Vents

Prevent moisture from getting trapped inside enclosures while letting air flow through

5 products

Heat-Shrink Tubing End Caps

Seal moisture out of crimped electrical connections

26 products

DIN Rail Caps

Guard the edges of DIN rail from damage and create a finished look

2 products

Cold-Shrink Tubing End Caps

Seal crimped electrical connections without heat or tools to protect against moisture

4 products

Circuit Breaker Box Filler Plates

Conceal live electrical components in circuit breaker boxes to prevent injury and damage

2 products

Capacitor Boots

Shield capacitors and wire connections to extend their service life and reduce accidental shocks

3 products

Electrical Connector Clips

Attach to data connectors to lock them in place, repair them, or color code them

3 products

Electrical Connector Caps

Protect data connectors when not in use

1 product

Data Port Locks

Block USB or Ethernet ports from unauthorized use

9 products

Data Port Plugs

Keep dust, debris, and moisture out of unused computer ports

3 products

Facility and Grounds Maintenance

Floor Drain Covers

Put a lid on open drains to prevent accidents and injuries

4 products

Floor Drain Trap Seals

Stop sewer gases from escaping through rarely used floor drains if the P-trap dries out

4 products

Faucet Hole Covers

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

2 products

Manhole Covers

Made of cast iron to handle high-volume foot and vehicle traffic.

6 products

Manhole Riser Rings

Raise a manhole cover to make it level with the surface

4 products

Storm Drain Filters

Prevent leaves, sticks, and trash from washing down storm drains and grates

3 products

Rebar Caps

Brightly colored to alert workers to exposed rebar and pipe

4 products

Fluid Handling

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

338 products

Bore Sealing Plugs

Permanently seal unthreaded holes in pneumatic and hydraulic components

73 products

Pipe and Pipe Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases through your facility

1,999 products

Hose and Hose Fittings

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

270 products

Breather Vents

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

90 products

Pressure Test Fittings

Create a temporary connection point for gauges and other testing equipment

28 products

Containers, Storage, and Furniture

Drum Plugs

Seal drum lid openings

19 products

Drum-Plug Caps

Access inside drums to fill them

4 products

Drum Covers

Protect drum lids from damage and rust

10 products

Drum Locking Rings

Clamp lids onto drums for a tight seal

7 products

Drum Lids

Replace the lid on your drum

16 products

Dust Covers

Stretch over drums, pails, and other objects to keep out dust and debris

12 products

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

6 products

Pipette Tip Filters

Trap contaminants when dispensing samples in labs and other sanitary environments

2 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

Fastening and Joining

Retaining Rings

Hold components on a shaft

25 products

Standoff Caps

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

66 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

Threaded Inserts

Create new threads or repair stripped threads

1 product

Press-Fit Nuts

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

2 products

Heating, Ventilation, and Air Conditioning

Chimney Pipe and Fittings

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

21 products

Air Conditioner Service Valve Caps

Seal off AC service valves to prevent refrigerant from leaking out

2 products

Material Handling

Conveyor Guide Mounting Rod Caps

Cover the ends of conveyor guide mounting rods for a finished look

7 products

Communication

Tamper-Evident Seals

Secure hasps, latches, and other connections to visibly indicate tampering

2 products

Sealing

Drum-Plug Gaskets

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

7 products

Drum Gaskets

Seal lids onto steel and stainless steel drums

6 products