Knockouts | McMaster-Carr

Filter by

System of Measurement

Diameter

Shape

Computer Connector

Round with Keyways

For Use On

Stainless Steel

Hole Diameter

Punching Action

Conduit Trade Size

Material

Aluminum Bronze

Carbide-Tipped Steel

Stainless Steel

Pipe Size

Length

ID

Head Diameter

Sold As

For Maximum Steel Thickness

Attachment Type

REACH

RoHS

Compliant with Exemptions

DFARS Specialty Metals

Export Control Classification Number (ECCN)

Stud Diameter

Knockout Trade Size

For Use With

Handheld Power Drills

Push-Button Holes

Fastener Head Type

End Type

Shaft Type

Thread Size

How can we improve?

3,306 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 Saw Arbors

Hole Saw Arbors

Secure a hole saw to a drill or drill press

Hole Saw Slug Removers

Hole Saw Slug Removers

Push or pull material out of hole saws to prevent binding

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

Die Bushings

Guide pins and punches in molds and stamping dies or reduce friction between ejector pins and plates

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.)