Knockouts | McMaster-Carr

Filter by

System of Measurement

Diameter

Shape

For Use On

Hole Diameter

Punching Action

Material

Conduit Trade Size

Length

Pipe Size

Attachment Type

Sold As

Head Diameter

For Maximum Steel Thickness

DFARS Specialty Metals

Exempt

Not Compliant

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

REACH

RoHS

Compliant with Exemptions

Not Compliant

Export Control Classification Number (ECCN)

Knockout Trade Size

For Use With

Handheld Power Drills

Hole Length

Panel Cutout Diameter

Fastener Head Type

Thread Size

3,293 Products

Hole Punches

Stud-Driven Hole Punches

Stud-Driven Round Hole Punches

Turn a wrench or driver to draw the punch onto the included stud

101 products

Stud-Driven Keyway Hole Punches

Cut through sheet metal to make holes for installing panel cutout switches

4 products

Self-Centering Stud-Driven Round Hole Punches

The center fits inside the pilot hole to make accurate holes every time

10 products

Stud-Driven Round Hole Punches for Pipe and Conduit

Turn a wrench or driver to draw the punch onto the included stud

36 products

European Standard Stud-Driven Round Hole Punches for Conduit

Turn a wrench or driver to draw the punch onto the included stud

22 products

Metric Stud-Driven Round Hole Punches for Conduit

Turn a wrench or driver to draw the punch onto the included stud

22 products

Metric Self-Centering Stud-Driven Round Hole Punches for Conduit

The center fits inside the pilot hole to make accurate holes every time

5 products

Stud-Driven Rectangle Hole Punches for Power/Control Connectors

Punch holes for installing heavy duty industrial connectors

7 products

Stud-Driven D Hole Punches

Cut through sheet metal to create holes for installing switches and instruments

12 products

Self-Centering Stud-Driven Round Hole Punches for Pipe and Conduit

The center fits inside the pilot hole to make accurate holes every time

9 products

Stud-Driven Square Hole Punches

Cut openings for a variety of panel switches and connectors

12 products

Manual Wrench-Operated Stud-Driven DIN-Size Hole Punches

Use a wrench to cut DIN-size holes in steel up to 1/16" thick

6 products

Fast-Cut Stud-Driven Computer-Connector-Shape Hole Punches

Cut through aluminum and steel fast to make openings for DB connectors

6 products

Stud-Driven Rectangle Hole Punches

Make openings for panel switches and connectors

9 products

Hydraulic Driver-Operated Stud-Driven DIN-Size Hole Punches

Cut DIN-size holes in steel up to 7/64" thick using a driver ram and hydraulic pump

4 products

Hammer-Driven Hole Punches

Strengthened edges cut holes in fabric, leather, rubber, and soft metal

93 products

Hammer-Driven Hole Punch Sets

A variety of one-piece tools to make round holes of different sizes

4 products

Stud-Driven Hole Punch Sets

Stud-Driven Hole Punch Sets with Straight Hydraulic Driver

Make straight punches with eight tons of force

1 product

Stud-Driven Hole Punch Sets for Pipe and Conduit

Use a ratchet wrench or hydraulic driver to draw the punch onto the included stud

6 products

Stud-Driven Hole Punch Sets with Right-Angle Hydraulic Driver

Rotate the angled head up to 180° to fit into tight spaces

1 product

European Standard Stud-Driven Hole Punch Sets for Conduit

Use a ratchet wrench or hydraulic driver to draw the punch onto the included stud

4 products

Stud-Driven Hole Punch Sets with High-Powered Straight Hydraulic Driver

Create large holes and make repeated punches with 11 tons of force

2 products

Metric Stud-Driven Hole Punch Sets for Conduit

Use a ratchet wrench or hydraulic driver to draw the punch onto the included stud

4 products

Self-Centering Stud-Driven Hole Punch Sets

The center fits inside the pilot hole to make varoius sizes of accurate holes every time

4 products

Self-Centering Stud-Driven Hole Punch Sets with Hydraulic Driver

Punches align themselves in pilot holes and use the hydraulic driver for power

4 products

Other Products

Electrical Enclosure Plugs

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

77 products

Hole Saws

Connect to a drill or drill press to make circular cuts

691 products

Protective Plugs

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

253 products

Conduit Reducing Washers

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

19 products

Hole Flaring Dies

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

2 products

Hole Saw Arbors

Secure a hole saw to a drill or drill press

25 products

Core Pins

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

1,274 products

Ejector Pins

Push finished parts out of molds

361 products

Punch Pins

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

30 products

Hole Saw Slug Removers

Push or pull material out of hole saws to prevent binding

1 product

Die Bushings

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

102 products

Ejector Sleeves

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

39 products

Broaches

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

43 products

Ejector Blades

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

106 products

Hole Saw Pilots

Center your hole saw when enlarging existing holes

2 products