Email: sales@a1tooling.com | Phone: (888) 988-8820
We ship from multiple warehouses throughout the USA
to get you what you need as fast as possible!
Millions of items in stock!
Fast online checkout - No account required
Cart 0
Cart 0

Holemaking Products - Counterbores & Porting Tools For Sale | A1 Tooling - (1669 Products)

Keo - 3mm Socket Head Cap Screw Compatible, Cobalt, Solid Pilot Counterbore - A1 Tooling

Keo - 3mm Socket Head Cap Screw Compatible, Cobalt, Solid Pilot Counterbore


Item #: 44850899
Brand: Keo
Model #: 56201

Features and Benefits

Cobalt is harder than high speed steel and provides better wear resistance. It is commonly used on high tensile alloys.
Bright provides a smooth, polished finish on the tool. It increases chip flow in softer materials such as aluminum, wood and plastic.
Product Specifications
Fastener Type Compatibility Socket-Head Cap Screw
Counterbore Diameter (mm) 6.00
Fastener Size Compatibility (mm) 3.00
Counterbore Material Cobalt
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (mm) 5.00
Number of Flutes 3
Pilot Diameter (mm) 3.20
Overall Length (mm) 71.00

$46.67

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

APT - 19/32" Cutting Diam, 3/32" Thick Blade, 3/8" Fastener Compatibility, Forward Cutting, Blade Type Counterbore Blade - A1 Tooling

APT - 19/32" Cutting Diam, 3/32" Thick Blade, 3/8" Fastener Compatibility, Forward Cutting, Blade Type Counterbore Blade


Item #: 08863748
Brand: APT
Model #: BB19

Product Specifications
Fastener Type Compatibility Socket-Head Cap Screw
Fastener Size Compatibility (Inch) 3/8
Cutting Diameter (Inch) 19/32
Cutting Direction Forward
Blade Thickness (Inch) 3/32
Blade Material High Speed Steel

$40.02

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Keo - 1/4" Socket Head Cap Screw Compatible, Cobalt, Solid Pilot Counterbore - A1 Tooling

Keo - 1/4" Socket Head Cap Screw Compatible, Cobalt, Solid Pilot Counterbore


Item #: 02828531
Brand: Keo
Model #: 55216

Features and Benefits

Cobalt is harder than high speed steel and provides better wear resistance. It is commonly used on high tensile alloys.
Bright provides a smooth, polished finish on the tool. It increases chip flow in softer materials such as aluminum, wood and plastic.
Product Specifications
Fastener Type Compatibility Socket-Head Cap Screw
Counterbore Diameter (Decimal Inch) 0.3980
Fastener Size Compatibility (Inch) 1/4
Counterbore Material Cobalt
Finish/Coating Bright
Standard or Oversize Pilot Oversize
Shank Diameter (Inch) 5/16
Number of Flutes 3
Aircraft-Style No
Pilot Diameter (Decimal Inch) 0.2650
Shank Type Straight
Overall Length (Inch) 4-1/2
Cutting Direction Forward

$60.57

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Keo - 1/4" Socket Head Cap Screw Compatible, Cobalt, Solid Pilot Counterbore - A1 Tooling

Keo - 1/4" Socket Head Cap Screw Compatible, Cobalt, Solid Pilot Counterbore


Item #: 02828549
Brand: Keo
Model #: 55217

Features and Benefits

Cobalt is harder than high speed steel and provides better wear resistance. It is commonly used on high tensile alloys.
Bright provides a smooth, polished finish on the tool. It increases chip flow in softer materials such as aluminum, wood and plastic.
Product Specifications
Fastener Type Compatibility Socket-Head Cap Screw
Counterbore Diameter (Decimal Inch) 0.4140
Fastener Size Compatibility (Inch) 1/4
Counterbore Material Cobalt
Finish/Coating Bright
Standard or Oversize Pilot Oversize
Shank Diameter (Inch) 5/16
Number of Flutes 3
Aircraft-Style No
Pilot Diameter (Decimal Inch) 0.2810
Shank Type Straight
Overall Length (Inch) 4-1/2
Cutting Direction Forward

$60.57

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Value Collection - 7/16" Head Diam, 1/8" Shank Diam, Counterbore Pilot - A1 Tooling

Value Collection - 7/16" Head Diam, 1/8" Shank Diam, Counterbore Pilot


Item #: 08902280
Brand: Value Collection
Model #:

Product Specifications
Head Diameter (Inch) 7/16
Shank Diameter (Inch) 1/8
Pilot Material Carbon Steel

$10.88

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Value Collection - 5/8" Head Diam, 1/4" Shank Diam, Counterbore Pilot - A1 Tooling

Value Collection - 5/8" Head Diam, 1/4" Shank Diam, Counterbore Pilot


Item #: 08905408
Brand: Value Collection
Model #:

Product Specifications
Head Diameter (Inch) 5/8
Shank Diameter (Inch) 1/4
Pilot Material Carbon Steel

$17.02

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Made in USA - 4 Flutes, 5/8" Diam, 5/16" Pilot Hole Diam, High Speed Steel Reverse Counterbore - A1 Tooling

Made in USA - 4 Flutes, 5/8" Diam, 5/16" Pilot Hole Diam, High Speed Steel Reverse Counterbore


Item #: 09937327
Brand: Made in USA
Model #:

Features and Benefits

High speed steel (HSS) provides good wear resistance and can be used in general purpose applications on both ferrous and nonferrous materials.
Product Specifications
Counterbore Diameter (Inch) 5/8
Pilot Hole Diameter (Inch) 5/16
Counterbore Material High Speed Steel
Standard Pilot Model Number Compatibility 185-6
Oversize Pilot Model Number Compatibility 186-9
Number of Flutes 4
Overall Length (Inch) 5/8
Corner Radius (Inch) 1/32
Aircraft-Style No

$39.26

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Made in USA - 4 Flutes, 1/4" Diam, 3/32" Pilot Hole Diam, Solid Carbide Reverse Counterbore - A1 Tooling

Made in USA - 4 Flutes, 1/4" Diam, 3/32" Pilot Hole Diam, Solid Carbide Reverse Counterbore


Item #: 09937897
Brand: Made in USA
Model #:

Features and Benefits

Solid carbide provides better rigidity than high speed steel. It is extremely heat resistant and used for high speed applications on cast iron, nonferrous materials, plastics and other tough-to-machine materials.
Product Specifications
Counterbore Diameter (Inch) 1/4
Pilot Hole Diameter (Inch) 3/32
Counterbore Material Solid Carbide
Standard Pilot Model Number Compatibility 185-1
Oversize Pilot Model Number Compatibility 186-1
Number of Flutes 4
Overall Length (Inch) 1/2
Corner Radius (Inch) 1/64
Aircraft-Style No

$188.48

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Made in USA - 4 Flutes, 7/8" Diam, 3/8" Pilot Hole Diam, Solid Carbide Reverse Counterbore - A1 Tooling

Made in USA - 4 Flutes, 7/8" Diam, 3/8" Pilot Hole Diam, Solid Carbide Reverse Counterbore


Item #: 09938176
Brand: Made in USA
Model #:

Features and Benefits

Solid carbide provides better rigidity than high speed steel. It is extremely heat resistant and used for high speed applications on cast iron, nonferrous materials, plastics and other tough-to-machine materials.
Product Specifications
Counterbore Diameter (Inch) 7/8
Pilot Hole Diameter (Inch) 3/8
Counterbore Material Solid Carbide
Standard Pilot Model Number Compatibility 185-7
Oversize Pilot Model Number Compatibility 186-10
Number of Flutes 4
Overall Length (Inch) 5/8
Corner Radius (Inch) 1/64
Aircraft-Style No

$215.99

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Made in USA - 4 Flutes, 5/16" Diam, 1/8" Pilot Hole Diam, Solid Carbide Reverse Counterbore - A1 Tooling

Made in USA - 4 Flutes, 5/16" Diam, 1/8" Pilot Hole Diam, Solid Carbide Reverse Counterbore


Item #: 09937921
Brand: Made in USA
Model #:

Features and Benefits

Solid carbide provides better rigidity than high speed steel. It is extremely heat resistant and used for high speed applications on cast iron, nonferrous materials, plastics and other tough-to-machine materials.
Product Specifications
Counterbore Diameter (Inch) 5/16
Pilot Hole Diameter (Inch) 1/8
Counterbore Material Solid Carbide
Standard Pilot Model Number Compatibility 185-2
Oversize Pilot Model Number Compatibility 186-2
Number of Flutes 4
Overall Length (Inch) 1/2
Corner Radius (Inch) 1/64
Aircraft-Style No

$152.61

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Made in USA - 4 Flutes, 9/16" Diam, 1/4" Pilot Hole Diam, High Speed Steel Reverse Counterbore - A1 Tooling

Made in USA - 4 Flutes, 9/16" Diam, 1/4" Pilot Hole Diam, High Speed Steel Reverse Counterbore


Item #: 09937293
Brand: Made in USA
Model #:

Features and Benefits

High speed steel (HSS) provides good wear resistance and can be used in general purpose applications on both ferrous and nonferrous materials.
Product Specifications
Counterbore Diameter (Inch) 9/16
Pilot Hole Diameter (Inch) 1/4
Counterbore Material High Speed Steel
Standard Pilot Model Number Compatibility 185-5
Oversize Pilot Model Number Compatibility 186-8
Number of Flutes 4
Overall Length (Inch) 5/8
Corner Radius (Inch) 1/32
Aircraft-Style No

$35.00

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Made in USA - 4 Flutes, 3/4" Diam, 1/4" Pilot Hole Diam, Solid Carbide Reverse Counterbore - A1 Tooling

Made in USA - 4 Flutes, 3/4" Diam, 1/4" Pilot Hole Diam, Solid Carbide Reverse Counterbore


Item #: 09938127
Brand: Made in USA
Model #:

Features and Benefits

Solid carbide provides better rigidity than high speed steel. It is extremely heat resistant and used for high speed applications on cast iron, nonferrous materials, plastics and other tough-to-machine materials.
Product Specifications
Counterbore Diameter (Inch) 3/4
Pilot Hole Diameter (Inch) 1/4
Counterbore Material Solid Carbide
Standard Pilot Model Number Compatibility 185-5
Oversize Pilot Model Number Compatibility 186-8
Number of Flutes 4
Overall Length (Inch) 5/8
Corner Radius (Inch) 1/64
Aircraft-Style No

$202.05

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Made in USA - 4 Flutes, 3/4" Diam, 5/16" Pilot Hole Diam, Solid Carbide Reverse Counterbore - A1 Tooling

Made in USA - 4 Flutes, 3/4" Diam, 5/16" Pilot Hole Diam, Solid Carbide Reverse Counterbore


Item #: 09938135
Brand: Made in USA
Model #:

Features and Benefits

Solid carbide provides better rigidity than high speed steel. It is extremely heat resistant and used for high speed applications on cast iron, nonferrous materials, plastics and other tough-to-machine materials.
Product Specifications
Counterbore Diameter (Inch) 3/4
Pilot Hole Diameter (Inch) 5/16
Counterbore Material Solid Carbide
Standard Pilot Model Number Compatibility 185-6
Oversize Pilot Model Number Compatibility 186-9
Number of Flutes 4
Overall Length (Inch) 5/8
Corner Radius (Inch) 1/64
Aircraft-Style No

$203.64

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Made in USA - 4 Flutes, 1-5/8" Diam, 3/4" Pilot Hole Diam, Carbide-Tipped Reverse Counterbore - A1 Tooling

Made in USA - 4 Flutes, 1-5/8" Diam, 3/4" Pilot Hole Diam, Carbide-Tipped Reverse Counterbore


Item #: 09938275
Brand: Made in USA
Model #:

Features and Benefits

Carbide tips cuts faster than high speed steel. It is commonly used on ferrous and nonferrous materials including cast iron, steel and steel alloys.
Product Specifications
Counterbore Diameter (Inch) 1-5/8
Pilot Hole Diameter (Inch) 3/4
Counterbore Material Carbide-Tipped
Standard Pilot Model Number Compatibility 185-10
Oversize Pilot Model Number Compatibility 186-22; 186-23; 186-24
Number of Flutes 4
Overall Length (Inch) 1
Corner Radius (Inch) 1/64
Aircraft-Style No

$346.84

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Made in USA - 4 Flutes, 1-3/4" Diam, 3/4" Pilot Hole Diam, Carbide-Tipped Reverse Counterbore - A1 Tooling

Made in USA - 4 Flutes, 1-3/4" Diam, 3/4" Pilot Hole Diam, Carbide-Tipped Reverse Counterbore


Item #: 09938283
Brand: Made in USA
Model #:

Features and Benefits

Carbide tips cuts faster than high speed steel. It is commonly used on ferrous and nonferrous materials including cast iron, steel and steel alloys.
Product Specifications
Counterbore Diameter (Inch) 1-3/4
Pilot Hole Diameter (Inch) 3/4
Counterbore Material Carbide-Tipped
Standard Pilot Model Number Compatibility 185-10
Oversize Pilot Model Number Compatibility 186-22; 186-23; 186-24
Number of Flutes 4
Overall Length (Inch) 1
Corner Radius (Inch) 1/64
Aircraft-Style No

$355.65

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Made in USA - 4 Flutes, 7/8" Diam, 3/8" Pilot Hole Diam, High Speed Steel Reverse Counterbore - A1 Tooling

Made in USA - 4 Flutes, 7/8" Diam, 3/8" Pilot Hole Diam, High Speed Steel Reverse Counterbore


Item #: 09937418
Brand: Made in USA
Model #:

Features and Benefits

High speed steel (HSS) provides good wear resistance and can be used in general purpose applications on both ferrous and nonferrous materials.
Product Specifications
Counterbore Diameter (Inch) 7/8
Pilot Hole Diameter (Inch) 3/8
Counterbore Material High Speed Steel
Standard Pilot Model Number Compatibility 185-7
Oversize Pilot Model Number Compatibility 186-10
Number of Flutes 4
Overall Length (Inch) 5/8
Corner Radius (Inch) 1/32
Aircraft-Style No

$91.47

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Made in USA - 4 Flutes, 9/16" Diam, 1/4" Pilot Hole Diam, Solid Carbide Reverse Counterbore - A1 Tooling

Made in USA - 4 Flutes, 9/16" Diam, 1/4" Pilot Hole Diam, Solid Carbide Reverse Counterbore


Item #: 09938051
Brand: Made in USA
Model #:

Features and Benefits

Solid carbide provides better rigidity than high speed steel. It is extremely heat resistant and used for high speed applications on cast iron, nonferrous materials, plastics and other tough-to-machine materials.
Product Specifications
Counterbore Diameter (Inch) 9/16
Pilot Hole Diameter (Inch) 1/4
Counterbore Material Solid Carbide
Standard Pilot Model Number Compatibility 185-5
Oversize Pilot Model Number Compatibility 186-8
Number of Flutes 4
Overall Length (Inch) 5/8
Corner Radius (Inch) 1/64
Aircraft-Style No

$148.88

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Made in USA - 4 Flutes, 1-7/8" Diam, 3/4" Pilot Hole Diam, High Speed Steel Reverse Counterbore - A1 Tooling

Made in USA - 4 Flutes, 1-7/8" Diam, 3/4" Pilot Hole Diam, High Speed Steel Reverse Counterbore


Item #: 09937533
Brand: Made in USA
Model #:

Features and Benefits

High speed steel (HSS) provides good wear resistance and can be used in general purpose applications on both ferrous and nonferrous materials.
Product Specifications
Counterbore Diameter (Inch) 1-7/8
Pilot Hole Diameter (Inch) 3/4
Counterbore Material High Speed Steel
Standard Pilot Model Number Compatibility 185-10
Oversize Pilot Model Number Compatibility 186-22; 186-23; 186-24
Number of Flutes 4
Overall Length (Inch) 1
Corner Radius (Inch) 1/32
Aircraft-Style No

$227.88

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Made in USA - 4 Flutes, 3/8" Diam, 1/8" Pilot Hole Diam, Solid Carbide Reverse Counterbore - A1 Tooling

Made in USA - 4 Flutes, 3/8" Diam, 1/8" Pilot Hole Diam, Solid Carbide Reverse Counterbore


Item #: 09937947
Brand: Made in USA
Model #:

Features and Benefits

Solid carbide provides better rigidity than high speed steel. It is extremely heat resistant and used for high speed applications on cast iron, nonferrous materials, plastics and other tough-to-machine materials.
Product Specifications
Counterbore Diameter (Inch) 3/8
Pilot Hole Diameter (Inch) 1/8
Counterbore Material Solid Carbide
Standard Pilot Model Number Compatibility 185-2
Oversize Pilot Model Number Compatibility 186-2
Number of Flutes 4
Overall Length (Inch) 1/2
Corner Radius (Inch) 1/64
Aircraft-Style No

$154.61

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It

Made in USA - 4 Flutes, 9/16" Diam, 3/16" Pilot Hole Diam, Solid Carbide Reverse Counterbore - A1 Tooling

Made in USA - 4 Flutes, 9/16" Diam, 3/16" Pilot Hole Diam, Solid Carbide Reverse Counterbore


Item #: 09938044
Brand: Made in USA
Model #:

Features and Benefits

Solid carbide provides better rigidity than high speed steel. It is extremely heat resistant and used for high speed applications on cast iron, nonferrous materials, plastics and other tough-to-machine materials.
Product Specifications
Counterbore Diameter (Inch) 9/16
Pilot Hole Diameter (Inch) 3/16
Counterbore Material Solid Carbide
Standard Pilot Model Number Compatibility 185-4
Oversize Pilot Model Number Compatibility 186-7
Number of Flutes 4
Overall Length (Inch) 5/8
Corner Radius (Inch) 1/64
Aircraft-Style No

$153.14

2% Off All Online Orders
Use Code: 2%OFF

Best Price Guarantee - Email Us A Better Published Price and We'll Beat It