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[W.L. Fuller, Inc.] [Products] [Counterbores] [Type "M"]
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Designed to cut clean holes in wood and plastic. Can also be used with stop collars. Counterbores for the flat under the heads of nails, spikes, and bolts. Allowing them to be sunk far enough beneath the surface to allow for a wood plug to be used to cover the head. Can be set at any point on a twist drill and held fast with two hex-socket set screws. Designed for clean cutting. Made of Carbon Steel or Stainless Steel and heat-treated for long tool life. We have several types of counterbores.
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Drill Charts
Steel Types

Type M Counterbores have a  3” overall length and are designed for deep counterboring.  They can also be used with drill jig bushings. Available in both Carbon Steel and also Stainless Steel for cutting hardwoods indicated by adding  “S” to the stock number. 

Drills for Counterbores

Type “M” mounted on a drill

*Special Sizes - Quotation on Request*
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Type ‘M’ Counterbores to cut wood and plastics

 3” O.A. with 3/8” or 1/2” shank to cut flat bottom hole in wood and plastics.

Stock Numbers

Drill Hole Size

Standard “M” Type

“MS” Type for Hard Woods

3/8” Shank

1/2” Shank

3/8” Shank

1/2” Shank

3/8” Cutting Diameter

1/8

M061256

M061258

MS061256

MS061258

9/64

M061406

M061408

MS061406

MS061408

5/32

M061566

M061568

MS061566

MS061568

11/64

M061716

M061718

MS061716

MS061718

3/16

M061876

M061878

MS061876

MS061878

13/64

M062036

M062038

MS062036

MS062038

7/32

M062186

M062188

MS062186

MS062188

7/16” Cutting Diameter

13/64

M072036

M072038

MS072036

MS072038

7/32

M072186

M072188

MS072186

MS072188

9/32

X

M072818

MS072816

MS072818

1/2” Cutting Diameter

1/8

M081256

M081258

MS081256

MS081258

9/64

M081406

M081408

MS081406

MS081408

5/32

M081566

M081568

MS081566

MS081568

11/64

M081716

M081718

MS081716

MS081718

3/16

M081876

M081878

MS081876

MS081878

13/64

M082036

M082038

MS082036

MS082038

7/32

M082186

M082188

MS082186

MS082188

1/4

M082506

M082508

MS082506

MS082508

9/32

X

M082818

MS082816

MS082818

5/16

X

M083128

MS083126

MS083128

5/8” Cutting Diameter

1/4

M102506

M102508

X

X

9/32

M102816

M102818

  X

  X

5/16

M103126

M103128

  X

  X

3/4” Cutting Diameter

1/4

M122506

M122508

  X

  X

5/16

M123126

M123128

  X

  X
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