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)

Cleveland - 3/4" Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore - A1 Tooling

Cleveland - 3/4" Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore


Item #: 81853731
Brand: Cleveland
Model #: C91737

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.
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 (Inch) 1-3/16
Fastener Size Compatibility (Inch) 3/4
Counterbore Material High Speed Steel
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (Inch) 1
Shank Diameter (mm) 25.40
Shank Diameter (Decimal Inch) 1.0000
Number of Flutes 3
Aircraft-Style No
Pilot Diameter (Inch) 13/16
Shank Type Straight
Overall Length (Inch) 8-13/16
Cutting Direction Forward
Material Application Alloy Tool Steel; Carbon Steel; Cast Iron

$298.32

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 - 3/4" Head Diam, 3/8" Shank Diam, Counterbore Pilot - A1 Tooling

Value Collection - 3/4" Head Diam, 3/8" Shank Diam, Counterbore Pilot


Item #: 08907487
Brand: Value Collection
Model #:

Product Specifications
Head Diameter (Inch) 3/4
Shank Diameter (Inch) 3/8
Pilot Material Carbon Steel

$19.42

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 - 11/16" Head Diam, 5/16" Shank Diam, Counterbore Pilot - A1 Tooling

Made in USA - 11/16" Head Diam, 5/16" Shank Diam, Counterbore Pilot


Item #: 78906443
Brand: Made in USA
Model #:

Product Specifications
Head Diameter (Inch) 11/16
Shank Diameter (Inch) 5/16
Finish/Coating Bright
Aircraft-Style No
Pilot Material Carbon Steel

$26.28

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

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

Union Butterfield - 15/16" Head Diam, 5/16" Shank Diam, Counterbore Pilot - A1 Tooling

Union Butterfield - 15/16" Head Diam, 5/16" Shank Diam, Counterbore Pilot


Item #: 66386756
Brand: Union Butterfield
Model #: 3210151

Product Specifications
Head Diameter (Inch) 15/16
Shank Diameter (Inch) 5/16
Finish/Coating Bright
Aircraft-Style No
Pilot Material High Speed Steel

$121.14

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

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

Keo - 6mm Socket Head Cap Screw Compatible, Cobalt, Solid Pilot Counterbore - A1 Tooling

Keo - 6mm Socket Head Cap Screw Compatible, Cobalt, Solid Pilot Counterbore


Item #: 44850741
Brand: Keo
Model #: 56214

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) 11.00
Fastener Size Compatibility (mm) 6.00
Counterbore Material Cobalt
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (mm) 8.00
Number of Flutes 3
Pilot Diameter (mm) 6.60
Overall Length (mm) 80.00

$60.89

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 - #8 Wire Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore - A1 Tooling

Made in USA - #8 Wire Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore


Item #: 08272759
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.
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) 0.3040
Fastener Size Compatibility (Wire) #8
Counterbore Material High Speed Steel
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (Inch) 1/4
Number of Flutes 4
Aircraft-Style No
Pilot Diameter (Decimal Inch) 0.1950
Shank Type Straight
Overall Length (Inch) 5
Cutting Direction Forward

$43.87

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

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

Cleveland - Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore - A1 Tooling

Cleveland - Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore


Item #: 81853889
Brand: Cleveland
Model #: C91749

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.
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 (Inch) 1-9/16
Counterbore Material High Speed Steel
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (Inch) 1
Shank Diameter (mm) 25.40
Shank Diameter (Decimal Inch) 1.0000
Number of Flutes 3
Aircraft-Style No
Pilot Diameter (Inch) 1-1/16
Shank Type Straight
Overall Length (Inch) 8-13/16
Cutting Direction Forward
Material Application Alloy Tool Steel; Carbon Steel; Cast Iron

$449.83

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 - 12mm Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore - A1 Tooling

Made in USA - 12mm Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore


Item #: 01570043
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.
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) 20.00
Fastener Size Compatibility (mm) 12.00
Counterbore Material High Speed Steel
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (Inch) 1/2
Shank Diameter (mm) 12.70
Number of Flutes 3
Aircraft-Style No
Pilot Diameter (mm) 13.00
Shank Type Straight
Overall Length (mm) 152.40
Overall Length (Inch) 6
Cutting Direction Forward

$113.11

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

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

Union Butterfield - 7/8" Head Diam, 3/8" Shank Diam, Counterbore Pilot - A1 Tooling

Union Butterfield - 7/8" Head Diam, 3/8" Shank Diam, Counterbore Pilot


Item #: 65706855
Brand: Union Butterfield
Model #: 3210162

Product Specifications
Head Diameter (Inch) 7/8
Shank Diameter (Inch) 3/8
Finish/Coating Bright
Aircraft-Style No
Pilot Material High Speed Steel

$114.90

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

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

Union Butterfield - 3/4" Head Diam, 7/16" Shank Diam, Counterbore Pilot - A1 Tooling

Union Butterfield - 3/4" Head Diam, 7/16" Shank Diam, Counterbore Pilot


Item #: 65707077
Brand: Union Butterfield
Model #: 3210176

Product Specifications
Head Diameter (Inch) 3/4
Shank Diameter (Inch) 7/16
Finish/Coating Bright
Aircraft-Style No
Pilot Material High Speed Steel

$92.60

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 - 1/4" Head Diam, 3/32" Shank Diam, Counterbore Pilot - A1 Tooling

Made in USA - 1/4" Head Diam, 3/32" Shank Diam, Counterbore Pilot


Item #: 78901162
Brand: Made in USA
Model #:

Product Specifications
Head Diameter (Inch) 1/4
Shank Diameter (Inch) 3/32
Finish/Coating Bright
Aircraft-Style No
Pilot Material Carbon Steel

$11.46

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

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

Keo - #10 to #4 Wire Socket Head Cap Screw Compatible, Cobalt, Solid Pilot Counterbore Set - A1 Tooling

Keo - #10 to #4 Wire Socket Head Cap Screw Compatible, Cobalt, Solid Pilot Counterbore Set


Item #: 02828762
Brand: Keo
Model #: 55239

Features and Benefits

Cobalt is harder than high speed steel and provides better wear resistance. It is commonly used on high tensile alloys.
Straight shanks are used for general purpose applications. The shank is smaller than the drill bit diameter. They are used with portable drills and drill presses on ferrous and non-ferrous materials.
Product Specifications
Fastener Type Compatibility Socket-Head Cap Screw
Minimum Fastener Size Compatibility (Inch) 1/4
Minimum Fastener Size Compatibility (mm) 6
Minimum Fastener Size Compatibility (Wire) #10
Maximum Fastener Size Compatibility (Wire) #4
Maximum Fastener Size Compatibility (Inch) 1/2
Standard or Oversize Pilot Standard
Number of Flutes 3
Counterbore Material Cobalt
Finish/Coating Bright
Fastener Size Compatibility (Wire) #4; #6; #8; #10
Fastener Size Compatibility (Inch) 1/4; 5/16; 3/8; 1/2
Number of Pieces 7
Shank Type Straight
Cutting Direction Forward
Storage Unit Type Case
Storage Unit Material Plastic
Aircraft-Style No

$464.76

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

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

Union Butterfield - 7/16" Head Diam, 5/16" Shank Diam, Counterbore Pilot - A1 Tooling

Union Butterfield - 7/16" Head Diam, 5/16" Shank Diam, Counterbore Pilot


Item #: 65706905
Brand: Union Butterfield
Model #: 3210143

Product Specifications
Head Diameter (Inch) 7/16
Shank Diameter (Inch) 5/16
Finish/Coating Bright
Aircraft-Style No
Pilot Material High Speed Steel

$48.52

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

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

Keo - 3/4" Socket Head Cap Screw Compatible, Cobalt, Solid Pilot Counterbore - A1 Tooling

Keo - 3/4" Socket Head Cap Screw Compatible, Cobalt, Solid Pilot Counterbore


Item #: 02828713
Brand: Keo
Model #: 55234

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) 1.2030
Fastener Size Compatibility (Inch) 3/4
Counterbore Material Cobalt
Finish/Coating Bright
Standard or Oversize Pilot Oversize
Shank Diameter (Inch) 3/4
Number of Flutes 3
Aircraft-Style No
Pilot Diameter (Decimal Inch) 0.7810
Shank Type Straight
Overall Length (Inch) 7
Cutting Direction Forward

$203.42

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

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

Union Butterfield - 1/2" Head Diam, 5/16" Shank Diam, Counterbore Pilot - A1 Tooling

Union Butterfield - 1/2" Head Diam, 5/16" Shank Diam, Counterbore Pilot


Item #: 65707416
Brand: Union Butterfield
Model #: 3210144

Product Specifications
Head Diameter (Inch) 1/2
Shank Diameter (Inch) 5/16
Finish/Coating Bright
Aircraft-Style No
Pilot Material High Speed Steel

$55.72

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

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

Union Butterfield - 1/2" Head Diam, 1/4" Shank Diam, Counterbore Pilot - A1 Tooling

Union Butterfield - 1/2" Head Diam, 1/4" Shank Diam, Counterbore Pilot


Item #: 65707440
Brand: Union Butterfield
Model #: 3210135

Product Specifications
Head Diameter (Inch) 1/2
Shank Diameter (Inch) 1/4
Finish/Coating Bright
Aircraft-Style No
Pilot Material High Speed Steel

$55.72

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

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

Cleveland - 3/4" Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore - A1 Tooling

Cleveland - 3/4" Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore


Item #: 81853723
Brand: Cleveland
Model #: C91735

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.
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 (Inch) 1-5/32
Fastener Size Compatibility (Inch) 3/4
Counterbore Material High Speed Steel
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (Inch) 1
Shank Diameter (mm) 25.40
Shank Diameter (Decimal Inch) 1.0000
Number of Flutes 3
Aircraft-Style No
Pilot Diameter (Inch) 25/32
Shank Type Straight
Overall Length (Inch) 8-13/16
Cutting Direction Forward
Material Application Alloy Tool Steel; Carbon Steel; Cast Iron

$302.65

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 - 13/16" Head Diam, 5/16" Shank Diam, Counterbore Pilot - A1 Tooling

Value Collection - 13/16" Head Diam, 5/16" Shank Diam, Counterbore Pilot


Item #: 08906521
Brand: Value Collection
Model #:

Product Specifications
Head Diameter (Inch) 13/16
Shank Diameter (Inch) 5/16
Pilot Material Carbon Steel

$20.78

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

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

Alvord Polk - 8-32 Fillister Head Screw Compatible, Solid Pilot Counterbore - A1 Tooling

Alvord Polk - 8-32 Fillister Head Screw Compatible, Solid Pilot Counterbore


Item #: 43997865
Brand: Alvord Polk
Model #: 33009

Features and Benefits

Titanium Nitride (TiN) is a multi-purpose coating which increases chip flow in softer materials. The heat and hardness resistance allows the tool to run at higher speeds than uncoated tools.
Product Specifications
Fastener Type Compatibility Fillister-Head Screw
Counterbore Diameter (Decimal Inch) 0.2720
Fastener Size Compatibility (Inch) 8-32
Finish/Coating TiN
Standard or Oversize Pilot Standard
Shank Diameter (Decimal Inch) 0.2500
Aircraft-Style No
Pilot Diameter (Decimal Inch) 0.1640
Shank Type Straight
Overall Length (Inch) 5
Overall Length (Decimal Inch) 5.00
Cutting Direction Forward

$46.27

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 - 7/32" Head Diam, 1/8" Shank Diam, Counterbore Pilot - A1 Tooling

Value Collection - 7/32" Head Diam, 1/8" Shank Diam, Counterbore Pilot


Item #: 08902140
Brand: Value Collection
Model #:

Product Specifications
Head Diameter (Inch) 7/32
Shank Diameter (Inch) 1/8
Pilot Material Carbon Steel

$10.22

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

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