Steel Hole Plugs | McMaster-Carr

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Material

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Pipe Size

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Thread Type

UN/UNF (SAE Straight)

Knockout Diameter

Finish

Corrosion-Resistant Coated

Epoxy Coated

Galvanized

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Zinc Phosphate Coated

Environment

High-Pressure Washdown

Panel Thickness

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REACH

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Compliant with Exemptions

Not Compliant

DFARS Specialty Metals

Performance

Export Control Classification Number (ECCN)

Pipe Material

Height

3,825 Products

Building and Machinery Hardware

Protective Plugs

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

173 products

Protective Caps

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

52 products

Grommets

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

44 products

Vibration-Damping Mounts

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

7 products

Strut Channel Framing and Fittings

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

28 products

Electrical

Electrical Enclosure Plugs

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

39 products

Electrical Enclosure Drains

Release moisture to keep components dry

2 products

Electrical Enclosure Drain Vents

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

4 products

Cable Entry Panels

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

14 products

Cord Grips

Securely connect cords to enclosures while sealing out dirt and moisture

255 products

Electrical Connector Caps

Protect data connectors when not in use

10 products

Fluid Handling

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

238 products

Bore Sealing Plugs

Permanently seal unthreaded holes in pneumatic and hydraulic components

65 products

Drain Valves

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

19 products

Pipe and Fittings

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

1,362 products

Tube and Tube Fittings

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

343 products

Hose and Hose Fittings

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

159 products

Breather Vents

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

85 products

Pressure Test Fittings

Create a temporary connection point for gauges and other testing equipment

27 products

Fabricating and Machining

Fixture Plate Plugs

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

3 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

35 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

64 products

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

1 product

Sink Drains

Empty liquids from sinks into sewer lines

9 products

Rebar Caps

Brightly colored to alert workers to exposed rebar and pipe

2 products

Lubricating

Oil Fittings

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

28 products

Oil Cups

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

14 products

Containers, Storage, and Furniture

Drum Plugs

Seal drum lid openings

9 products

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

6 products

Safety Equipment

Floor Drain Plugs

Prevent oil and other spills from going down your floor drain

3 products