Knockouts | McMaster-Carr

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System of Measurement

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Shape

Computer Connector

Round with Keyways

For Use On

Hole Diameter

Punching Action

Conduit Trade Size

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Material

Stainless Steel

ID

Length

Head Diameter

Sold As

For Maximum Steel Thickness

REACH

Export Control Classification Number (ECCN)

DFARS Specialty Metals

RoHS

Compliant with Exemptions

Stud Diameter

Knockout Trade Size

Panel Cutout Diameter

Fastener Head Type

End Type

Hole Length

For Use With

Handheld Power Drills

Push-Button Holes

Pin Type

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3,210 Products

Fabricating and Machining

Hole Punches

Punch holes in metal, plastic, and fabric

Punch Pins

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

Hole Saws

Connect to a drill or drill press to make circular cuts

Hole Flaring Dies

Hole Flaring Dies

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

Core Pins

Add to molds and pour in plastic to form holes in finished parts

Ejector Pins

Push finished parts out of molds

Ejector Sleeves

Ejector Sleeves

Use with mold pins to form holes, bosses, and other features in parts

Ejector Blades

Flat end pushes thin-walled parts out of molds better than ejector pins

Broaches

Install in an arbor press, milling machine, or CNC machine to cut shapes into existing holes

Hole Saw Pilots

Hole Saw Pilots

Center your hole saw when enlarging existing holes

Electrical

Electrical Enclosure Plugs

Electrical Enclosure Plugs

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

Conduit Knockout Reducers

Conduit Knockout Reducers

Shrink knockout sizes in electrical boxes to connect smaller conduit

Building and Machinery Hardware

Protective Plugs

Protective Plugs

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

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)