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 > Counterbores & Porting Tools (ET04) - (2029 Products)

Holemaking > Counterbores & Porting Tools (ET04)
Value Collection - 3/4" Head Diam, 1/4" Shank Diam, Counterbore Pilot - A1 Tooling

Value Collection - 3/4" Head Diam, 1/4" Shank Diam, Counterbore Pilot


Item #: 08905481
Brand: Value Collection
Model #:

Product Specifications
Head Diameter (Inch) 3/4
Shank Diameter (Inch) 1/4
Pilot Material Carbon Steel

$18.39

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

Union Butterfield - 15/16" Head Diam, 3/8" Shank Diam, Counterbore Pilot


Item #: 65707234
Brand: Union Butterfield
Model #: 3210163

Product Specifications
Head Diameter (Inch) 15/16
Shank Diameter (Inch) 3/8
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

Alvord Polk - 6mm Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore - A1 Tooling

Alvord Polk - 6mm Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore


Item #: 43981463
Brand: Alvord Polk
Model #: 03083

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) 0.4134
Fastener Size Compatibility (mm) 6.00
Fastener Size Compatibility (Decimal Inch) 0.2362
Counterbore Material High Speed Steel
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (Decimal Inch) 0.3125
Aircraft-Style No
Pilot Diameter (Decimal Inch) 0.2559
Shank Type Straight
Overall Length (Inch) 5-5/8
Overall Length (Decimal Inch) 5.63
Cutting Direction Forward

$50.11

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

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

Cleveland - 3/16" Head Diam, 3/32" Shank Diam, Counterbore Pilot - A1 Tooling

Cleveland - 3/16" Head Diam, 3/32" Shank Diam, Counterbore Pilot


Item #: 63676829
Brand: Cleveland
Model #: C46538

Product Specifications
Head Diameter (Inch) 3/16
Shank Diameter (Inch) 3/32
Finish/Coating Bright
Aircraft-Style No
Pilot Material High Speed Steel
Material Application Alloy Tool Steel; Aluminum; Cast Iron; Low Carbon Steel; Medium Carbon Steel

$23.01

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

Made in USA - #4 Wire Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore


Item #: 08272668
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) 0.2180
Fastener Size Compatibility (Wire) #4
Counterbore Material High Speed Steel
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (Inch) 5/32
Number of Flutes 4
Aircraft-Style No
Pilot Diameter (Decimal Inch) 0.1430
Shank Type Straight
Overall Length (Inch) 3-7/8
Cutting Direction Forward

$38.83

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 - 1/4" Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore - A1 Tooling

Made in USA - 1/4" Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore


Item #: 08272791
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) 0.3800
Fastener Size Compatibility (Inch) 1/4
Fastener Size Compatibility (Decimal Inch) 0.2500
Counterbore Material High Speed Steel
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (Inch) 5/16
Shank Diameter (Decimal Inch) 0.3125
Number of Flutes 4
Aircraft-Style No
Pilot Diameter (Inch) 1/4
Pilot Diameter (Decimal Inch) 0.2500
Shank Type Straight
Overall Length (Inch) 5-5/8
Cutting Direction Forward

$46.91

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

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

Cleveland - 3/8" Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore - A1 Tooling

Cleveland - 3/8" Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore


Item #: 81852360
Brand: Cleveland
Model #: C91712

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) 9/16
Fastener Size Compatibility (Inch) 3/8
Counterbore Material High Speed Steel
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (Inch) 1/2
Shank Diameter (mm) 12.70
Shank Diameter (Decimal Inch) 0.5000
Number of Flutes 3
Aircraft-Style No
Pilot Diameter (Inch) 3/8
Shank Type Straight
Overall Length (mm) 165.10
Overall Length (Inch) 6-1/2
Overall Length (Decimal Inch) 6.50
Cutting Direction Forward
Material Application Alloy Tool Steel; Carbon Steel; Cast Iron

$135.75

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 - 9/16" Head Diam, 1/2" Shank Diam, Counterbore Pilot - A1 Tooling

Union Butterfield - 9/16" Head Diam, 1/2" Shank Diam, Counterbore Pilot


Item #: 65706830
Brand: Union Butterfield
Model #: 3210195

Product Specifications
Head Diameter (Inch) 9/16
Shank Diameter (Inch) 1/2
Finish/Coating Bright
Aircraft-Style No
Pilot Material High Speed Steel

$72.76

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

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


Item #: 08272965
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) 1.1310
Fastener Size Compatibility (Inch) 3/4
Fastener Size Compatibility (Decimal Inch) 0.7500
Counterbore Material High Speed Steel
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (Inch) 3/4
Shank Diameter (Decimal Inch) 0.7500
Number of Flutes 4
Aircraft-Style No
Pilot Diameter (Inch) 3/4
Pilot Diameter (Decimal Inch) 0.7500
Shank Type Straight
Overall Length (Inch) 7-3/4
Cutting Direction Forward

$166.40

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

Made in USA - 11/16" Head Diam, 1/4" Shank Diam, Counterbore Pilot


Item #: 78905445
Brand: Made in USA
Model #:

Product Specifications
Head Diameter (Inch) 11/16
Shank Diameter (Inch) 1/4
Finish/Coating Bright
Aircraft-Style No
Pilot Material Carbon Steel

$20.59

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

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

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 #: 44850907
Brand: Keo
Model #: 56200

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) 2.50
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

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

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


Item #: 81852089
Brand: Cleveland
Model #: C91698

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) 0.2860
Fastener Size Compatibility (Wire) #8
Counterbore Material High Speed Steel
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (Inch) 1/4
Shank Diameter (mm) 6.35
Shank Diameter (Decimal Inch) 0.2500
Number of Flutes 3
Aircraft-Style No
Pilot Diameter (Decimal Inch) 0.1780
Shank Type Straight
Overall Length (mm) 76.20
Overall Length (Inch) 3
Overall Length (Decimal Inch) 3.00
Cutting Direction Forward
Material Application Alloy Tool Steel; Carbon Steel; Cast Iron

$109.33

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 - 5/32" Head Diam, 1/8" Shank Diam, Counterbore Pilot - A1 Tooling

Union Butterfield - 5/32" Head Diam, 1/8" Shank Diam, Counterbore Pilot


Item #: 65707002
Brand: Union Butterfield
Model #: 3210251

Product Specifications
Head Diameter (Inch) 5/32
Shank Diameter (Inch) 1/8
Finish/Coating Bright
Aircraft-Style No
Pilot Material High Speed Steel

$43.11

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

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

Interstate - 8mm Compatible Cobalt, Solid Pilot Counterbore - A1 Tooling

Interstate - 8mm Compatible Cobalt, Solid Pilot Counterbore


Item #: 45403433
Brand: Interstate
Model #:

Features and Benefits

Cobalt is harder than high speed steel and provides better wear resistance. It is commonly used on high tensile alloys.
Product Specifications
Counterbore Diameter (mm) 15.00
Fastener Size Compatibility (mm) 8.00
Counterbore Material Cobalt
Shank Diameter (Decimal Inch) 0.5000
Number of Flutes 3
Pilot Diameter (mm) 9.00
Shank Type Straight
Overall Length (mm) 152.40
Cutting Direction Forward

$47.43

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

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

Cleveland - 7/32" Head Diam, 3/32" Shank Diam, Counterbore Pilot - A1 Tooling

Cleveland - 7/32" Head Diam, 3/32" Shank Diam, Counterbore Pilot


Item #: 63676845
Brand: Cleveland
Model #: C46549

Product Specifications
Head Diameter (Inch) 7/32
Shank Diameter (Inch) 3/32
Finish/Coating Bright
Aircraft-Style No
Pilot Material High Speed Steel
Material Application Alloy Tool Steel; Aluminum; Cast Iron; Low Carbon Steel; Medium Carbon Steel

$26.29

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 - 3mm Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore - A1 Tooling

Made in USA - 3mm Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore


Item #: 01569987
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) 6.00
Fastener Size Compatibility (mm) 3.00
Counterbore Material High Speed Steel
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (Inch) 3/8
Shank Diameter (mm) 9.53
Number of Flutes 3
Aircraft-Style No
Pilot Diameter (mm) 3.40
Shank Type Straight
Overall Length (mm) 88.90
Overall Length (Decimal Inch) 3.50
Cutting Direction Forward

$52.93

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

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

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

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


Item #: 02828382
Brand: Keo
Model #: 55201

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) 0.2020
Fastener Size Compatibility (Wire) #4
Counterbore Material Cobalt
Finish/Coating Bright
Standard or Oversize Pilot Oversize
Shank Diameter (Inch) 5/32
Number of Flutes 3
Aircraft-Style No
Pilot Diameter (Decimal Inch) 0.1270
Shank Type Straight
Overall Length (Inch) 3
Cutting Direction Forward

$47.16

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

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

Interstate - 14mm Compatible High Speed Steel, Solid Pilot Counterbore - A1 Tooling

Interstate - 14mm Compatible High Speed Steel, Solid Pilot Counterbore


Item #: 45403466
Brand: Interstate
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 (mm) 24.00
Fastener Size Compatibility (mm) 14.00
Counterbore Material High Speed Steel
Number of Flutes 3
Pilot Diameter (mm) 15.00
Shank Type Morse Taper
Shank Taper Designation 2MT
Overall Length (Inch) 8-1/4
Cutting Direction Forward

$68.12

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

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


Item #: 08272981
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) 1.1650
Fastener Size Compatibility (Inch) 3/4
Counterbore Material High Speed Steel
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (Inch) 3/4
Number of Flutes 4
Aircraft-Style No
Pilot Diameter (Decimal Inch) 0.7810
Shank Type Straight
Overall Length (Inch) 7-3/4
Cutting Direction Forward

$166.40

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 - 7/16" Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore - A1 Tooling

Made in USA - 7/16" Socket Head Cap Screw Compatible, High Speed Steel, Solid Pilot Counterbore


Item #: 08272882
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) 0.6630
Fastener Size Compatibility (Inch) 7/16
Counterbore Material High Speed Steel
Finish/Coating Bright
Standard or Oversize Pilot Standard
Shank Diameter (Inch) 1/2
Number of Flutes 4
Aircraft-Style No
Pilot Diameter (Decimal Inch) 0.4370
Shank Type Straight
Overall Length (Inch) 7
Cutting Direction Forward

$76.58

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

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