Hole Covers | McMaster-Carr

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Pipe Size

Attachment Type

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UN/UNF (SAE Straight)

Head Diameter

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Hole Diameter

Panel Thickness

Thread Size

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REACH

RoHS

Compliant with Exemptions

Not Compliant

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

2A992

2B999

EAR99

DFARS Specialty Metals

7,243 Products

Building and Machinery Hardware

Protective Plugs

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

1,009 products

Protective Caps

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

1,070 products

Grommets

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

1,072 products

Slip-On Framing End Caps

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

25 products

Bolt-Together Framing End Caps

Cover the rough ends of bolt-together framing rails for a finished look

1 product

Strut Channel Framing and Fittings

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

110 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 End Caps

Fit into the end of clamp-on framing rails to use as a cover or foot

1 product

Locking-Slotted Framing End Caps

Snap onto locking-slotted rails to protect the ends and keep out dust and grime

1 product

Press-Fit Framing End Caps

Push into press-fit rails for a finished look that keeps out debris

2 products

Electrical Power, Networking, and Controlling

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

22 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

Data Port Locks

Block USB or Ethernet ports from unauthorized use

9 products

USB Connector Caps

Shield unused USB connectors from damage, contaminants, and moisture

1 product

RJ45 Connector Security Clips

Lock Ethernet cords in place to prevent unauthorized removal from ports

3 products

Data Port Plugs

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

3 products

Capacitor Boots

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

3 products

Circuit Breaker Box Filler Plates

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

2 products

Facility and Grounds Maintenance

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

Floor Drain Covers

Put a lid on open drains to prevent accidents and injuries

4 products

Manhole Riser Rings

Raise a manhole cover to make it level with the surface

4 products

Floor Drain Trap Seals

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

4 products

Rebar Caps

Brightly colored to alert workers to exposed rebar and pipe

4 products

Storm Drain Filters

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

3 products

Fluid Handling

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

346 products

Bore Sealing Plugs

Permanently seal unthreaded holes in pneumatic and hydraulic components

95 products

Pipe and Fittings

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

2,496 products

Hose Fittings

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

279 products

Pipe Vent Caps

Keep rain and debris out of vertical exhaust pipe

5 products

Pressure Test Fittings

Create a temporary connection point for gauges and other testing equipment

31 products

Breather Vents

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

98 products

Containers, Storage, and Furniture

Drum Plugs

Seal drum lid openings

27 products

Drum Locking Rings

Clamp lids onto drums for a tight seal

7 products

Drum Lids

Replace the lid on your drum

16 products

Drum Plug Caps

Access inside drums to fill them

4 products

Dust Covers

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

12 products

Drum Covers

Protect drum lids from damage and rust

10 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

Fastening and Joining

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

Quick-Release Pin Receptacles

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

36 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

66 products

Fabricating and Machining

Fixture Plate Plugs

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

8 products

Material Handling

Conveyor Guide Mounting Rod Caps

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

7 products

Sealing

Drum Gaskets

Seal lids onto steel and stainless steel drums

6 products

Drum Plug Gaskets

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

7 products

Heating, Ventilation, and Air Conditioning

Air Conditioner Service Valve Caps

Seal off AC service valves to prevent refrigerant from leaking out

2 products

Chimney Vent Caps

Cover chimneys to reduce downdrafts and block out debris

12 products

Communication

Tamper-Evident Seals

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

2 products