Knockouts | McMaster-Carr

Filter by

System of Measurement

Diameter

Shape

Computer Connector

Round with Keyways

For Use On

Stainless Steel

Hole Diameter

Punching Action

Material

Aluminum Bronze

Carbide-Tipped Steel

Stainless Steel

Conduit Trade Size

Pipe Size

ID

Length

Attachment Type

Head Diameter

Sold As

REACH

DFARS Specialty Metals

RoHS

Compliant with Exemptions

Export Control Classification Number (ECCN)

For Maximum Steel Thickness

Stud Diameter

Knockout Trade Size

Thread Size

For Use With

Handheld Power Drills

Push-Button Holes

Fastener Head Type

Panel Cutout Diameter

Tooth Material

Carbide-Tipped Steel

How can we improve?

3,295 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 Blades

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

Ejector Sleeves

Ejector Sleeves

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

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.)