Page 32 - All Industrial Tool Supply | General Catalog

COUNTERSINKS • Technical Information
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Countersinking
Countersinks open up the top of an existing drilled hole to allow for the head of a flat head screw to set
flush to the workpiece. The zero flute countersinks can also deburr the top of an existing hole as well.
types

Single Flute: Large positive rake and single flute construction provide a smooth surface finish
on a wide variety of materials. Known to be the most centering of all the countersinks.

Three & Four Flute: End user can expect the best chip clearance, and these are suitable
when machining plastics & non-ferrous metals like aluminum, copper, brass & bronze.

Six Flute: Provides for the highest feed rate of all countersinks. Cutting load is evenly
distributed providing a longer tool life.

Drill Point: This design allows the user to spot drill & countersink with the same tool.

CNC: Tight dimensions on length and angle ensure setting accuracy and repeatability.
T
Technical Information • COUNTERSINKS echnical Information • COUNTERSINKS

CouNTerSuNk Hole wAiTiNg For SCrew MouNTiNg
Zero Flute & Deburring: Chatter-free cutting action requires minimal power. Through-hole
design allows for tool resharpening.

Micro Stop: The countersink depth can be controlled with the use of the micro stop fixture.

FlAT HeAD CAP SCrew MouNTeD iN
CouNTerSuNk Hole
Aircraft: Shorter overall lengths provide better rigidity and allow for faster speeds.

tool Materials Finish/Coating angle options
Choice of tool material is driven by the Coating or surface treatments have a direct effect
workpiece material and number of holes desired on tool performance and tool life. They also build a
along with the life of the countersink. barrier between the cutting tool and workpiece.
60º: Designed for creating holes on
a shaft that will be used to machine
Cobalt: M35, M42 – Better than high Bright: Surface is untreated. Use for general between centers.
speed steel. Cobalt countersinks hold purpose countersinking of most metals, wood
their hardness at much higher temperatures and plastic.
and are well suited for harder to machine
materials and stainless steels.
82º: Creates holes that match
Steam Homogeneous Surface Treatment: the angle of popular flat and
Blackening – to prolong tool life & prevent galling. oval head screws.
High Speed Steel: Economical choice
for general applications in most materials
including steel, cast iron and forgings.
Provides good tool life and efficiency.
TiN Coated: Long Life Titanium Nitride – 90º: Creates holes that match
Bright Gold – is a very hard ceramic material, the angle of popular flat and
and when used to coat a high speed steel bit can oval head screws & is used to
extend the cutting life by three or more times. enlarge existing holes.
Solid Carbide: Resists wear better than Increases machining speeds by 25% to 30%.
both high speed steel and cobalt steel.
Has a better degree of accuracy for
countersinking very hard materials such
as stainless steel, titanium alloys and
nickel alloys.