Panel Knockouts | McMaster-Carr

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3,847 Products

Most Likely Products

Hole Punches

Punch holes in metal, plastic, and fabric

423 products

Electrical Enclosure Plugs

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

77 products

Protective Plugs

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

1,009 products

Grommets

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

806 products

All Results

Fabricating and Machining

Hole Punches

Punch holes in metal, plastic, and fabric

423 products

Punch Pins

Use with press dies to punch 1/8" and larger holes; modify to fit your application

30 products

Hole Saws

Connect to a drill or drill press to make circular cuts

693 products

Hole Saw Slug Removers

Push or pull material out of hole saws to prevent binding

1 product

Hole Saw Arbors

Secure a hole saw to a drill or drill press

25 products

Hole Saw Pilots

Center your hole saw when enlarging existing holes

2 products

Hole Flaring Dies

Create flares around holes in sheet metal to make the edges stronger and more rigid

2 products

Hole Saw Arbor Extensions

Reach your hole saw into spots where your drill is too big to fit

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

Conduit Reducing Washers

Shrink knockout sizes in outlet boxes or enclosures to connect smaller conduit

19 products

Heat-Shrink Tubing

Apply heat to seal and insulate electrical wiring and connections

3 products

Power Connectors

Plugs, sockets, receptacles, and other connectors for powering equipment

367 products

Mini Receptacles

Install in walls and panels and pair with plugs to send power and signal

55 products

RJ45 Connectors

Plugs, sockets, and receptacles to make Ethernet connections

45 products

Audio Connectors

Plugs, sockets, receptacles, and adapters to make audio connections

12 products

Coaxial Connectors

Plugs, sockets, receptacles, and adapters to make coaxial connections

6 products

Metric Circular Connectors

Plugs, sockets, receptacles, and adapters for equipment with metric connections

162 products

D-Sub Connectors

Plugs, sockets, receptacles, and adapters for connecting computers, monitors, and printers

15 products

CB Radio Receptacles

Install in a wall or panel and pair with sockets to connect CB radios

1 product

Mil. Spec. Receptacles

Install in walls and panels and pair with Mil. Spec. plugs

67 products

Ecomate Receptacles

Install in walls and panels and pair with plugs to make Ecomate connections

9 products

Power Connector Caps

Cover pin-and-sleeve power connectors when they're not in use

2 products

Circuit Breaker Box Filler Plates

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

2 products

Power Supplies

Convert your facility's AC voltage to power equipment that runs on DC voltage

5 products

Building and Machinery Hardware

Protective Plugs

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

1,009 products

Grommets

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

806 products