Hole Plugs | McMaster-Carr

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Material

Shape

Color

Head Diameter

Panel Thickness

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Hole Diameter

Fitting Type

Knockout Trade Size

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Thread Size

Height

Overall Height

Thread Type

Chicago Fire Department

UN/UNF (SAE Straight)

Knockout Diameter

For Material Thickness

Flange Diameter

For Use With

RoHS

Compliant with Exemptions

Not Compliant

REACH

Compliant

Not Compliant

DFARS Specialty Metals

Compliant

Exempt

Not Compliant

Export Control Classification Number (ECCN)

9,756 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

941 products

Bumpers

Absorb impact to protect equipment and surfaces from dents and scuffs

219 products

Vibration-Damping Mounts

Attach to machinery to reduce vibration and noise and extend service life

92 products

Slip-On Framing and Fittings

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

25 products

Strut Channel Framing and Fittings

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

78 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 Vents

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

1 product

Electrical Enclosure Drains

Release moisture to keep components dry

4 products

Electrical Enclosure Drain Vents

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

6 products

Cord Grips

Securely connect cords to enclosures while sealing out dirt and moisture

1,190 products

Cable Entry Panels

Pass multiple cords into an enclosure while sealing out moisture, dust, and other contaminants

120 products

DIN Rail Caps

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

2 products

Heat-Shrink Tubing

Apply heat to seal and insulate electrical wiring and connections

3 products

Electrical Connector Caps

Protect data connectors when not in use

78 products

Data Port Plugs

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

3 products

Data Port Locks

Block USB or Ethernet ports from unauthorized use

9 products

Electrical Connector Seals

Add to the front or back of connectors to block out dust, debris, and weather

5 products

Electrical Connector Clips

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

3 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

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

Drain Valves

Vent air or discharge liquids to remove excess fluid from your system

62 products

Pipe and Pipe Fittings

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

1,999 products

Tube and Tube Fittings

Typically more flexible than pipe for carrying liquids and gases in short runs around equipment

610 products

Hose and Hose Fittings

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

271 products

Breather Vents

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

147 products

Pressure Test Fittings

Create a temporary connection point for gauges and other testing equipment

28 products

Heat Exchanger Plugs

Plug leaky internal tubes in heat exchangers

17 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

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

Rivets

Join materials together permanently, especially when too thin or fragile to fasten with screws

125 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

Retaining Rings

Hold components on a shaft

25 products

Facility and Grounds Maintenance

Faucet Hole Covers

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

2 products

Shower Stoppers

Push down to plunge and cut trapped material to prevent clogs

1 product

Floor Drain Trap Seals

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

4 products

Sink Drains

Empty liquids from sinks into sewer lines

23 products

Sink Drain Stoppers

Plug drains to fill up sinks and tubs

5 products

Drain Check Valves

Prevent water damage by placing into floor drains to stop sewer back-ups

3 products

Drain Cleanouts

Create an access point to inspect and clean floor drain pipelines

3 products

Rebar Caps

Brightly colored to alert workers to exposed rebar and pipe

4 products

Safety Equipment

Earplugs

Protect your hearing in loud environments without the bulk of earmuffs

40 products

Fire Hydrant Caps

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

4 products

Fire Stops

Prevent fire and smoke from passing through holes in fire-resistant walls and floors

2 products

Fire Hydrant Plugs

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

3 products

Floor Drain Plugs

Prevent oil and other spills from going down your floor drain

3 products

Spill-Control Drain Covers

Block grates and manholes so liquid can't get in and odors can't get out

7 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 Locks

Secure drum lids and openings to prevent tampering

3 products

Dust Covers

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

16 products

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

6 products

Lubricating

Oil Fittings

Install in engine blocks and other machinery to pour in oil while keeping dust out

36 products

Oil Cups

Instead of manually lubricating equipment, a built-in reservoir gradually delivers oil

14 products

Grease Fitting Caps

Protect grease fittings from dirt, debris, and moisture

14 products

Material Handling

Conveyor Guide Mounting Rod Caps

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

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

Communication

Tamper-Evident Seals

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

2 products