Knockouts | McMaster-Carr

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3,295 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

Fabricating and Machining

Hole Punches

Punch holes in metal, plastic, and fabric

285 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

648 products

Hole Saw Arbors

Secure a hole saw to a drill or drill press

25 products

Hole Saw Slug Removers

Push or pull material out of hole saws to prevent binding

1 product

Hole Flaring Dies

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

2 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

Ejector Sleeves

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

39 products

Ejector Blades

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

106 products

Die Bushings

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

102 products

Broaches

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

43 products

Hole Saw Pilots

Center your hole saw when enlarging existing holes

2 products

Building and Machinery Hardware

Protective Plugs

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

253 products