Page 240 - All Industrial Tool Supply | General Catalog

COUNTERBORES • Technical Information
238

Counterboring
Counterbores hide the head of a screw or bolt by enlarging the top portion of an existing hole.
If the depth is shallow, it is known as spot-facing.
types

PIloT Hole
Interchangeable Pilot: This style offers greater flexibility to the end user when selecting a pilot size.
By switching the pilot, a single tool can be utilized in many different hole diameters.
Pilot simply slides into the built-in pilot hole in the counterbore.
Pilots are not included with interchangeable type counterbores.

InTegral PIloT
Solid Cap Screw: One piece construction includes the pilot thereby providing
a very accurate hole.

forward Blade BaCkward Blade

Blade SloT
Inserted Blade: Unique design allows for forward and backward cutting.
Insertable and replaceable forward and backward blades can be resharpened.
tool Material

Cobalt: M35/M42 – Provides longer tool life in a wider range of workpiece materials vs. high speed steel.

High Speed Steel: Provides good wear resistance in mild steels & non-ferrous materials.
nuMber of flutes

Two flute Integral Pilot Style:
Basic version and provides the most economical price
workPIeCe SHown wITH 2 ComPleTed CounTerBored HoleS

Three flute Integral Pilot Style:
Provides more contacts vs. the two flute
thereby evenly dispersing stress when cutting.

Three flute Interchangeable Pilot Style:
workPIeCe SHown wITH SoCkeT CaP SCrew In
Provides more contacts vs. the two flute thereby evenly 1 ComPleTed CounTerBored and THreaded Hole
dispersing stress when cutting. Can be used in many
different hole diameters by switching out the pilot.