countersink - side view
Countersinks are designed to produce accurate center holes in components which require matching between centers. They are available with
0 flutes (deburring)
1 flute (single)
3 flutes (center reamer)
4 flutes (machine)
6 flutes (chatterless)
ADJUSTABLE COUNTERSINKS
Adjustable Countersinks page 172A
Carbide Tipped Adjustable Drill Countersinks are designed to cut bevels in wood and plastic for wood screw heads #4 to #10. They attach to the drill with two set screws and can be adjusted up and down the drill for any length from a #4 to a #10 wood screw.
DRILL COUNTERSINKS
Drill Countersinks for Wood Screws page 172A
Drill Countersinks are designed to cut bevels in wood and plastic for wood screw heads. They attach to the drill with two set screws and can be adjusted up and down the drill for any length of wood screw. All Drill Countersinks have 4 flutes.
COMBINED DRILL AND COUNTERSINKS
Combined Drill and Countersinks - High Speed Steel page 114
Plain Type High Speed Steel Combined Drill and Countersinks are designed to produce accurate center holes in components which require machining between centers. Sizes #0 to #000 are often referred to as Missile & Aircraft series.

Combined Drill and Countersinks - High Speed Steel - (METRIC) page 182C
Metric Plain Type Combined Drill and Countersinks are designed to produce accurate center holes in components which require machining between centers.

Combined Drill and Countersinks - High Speed Steel - (LEFT HAND) page 182A
Left Hand Plain Type High Speed Steel Combined Drill and Countersinks are designed to produce accurate center holes in components which require machining between centers. Sizes #0 to #000 are often referred to as Missile & Aircraft series.

Combined Drill and Countersinks - M42 Cobalt page 119
Plain Type M42 Cobalt Combined Drill and Countersinks are designed to produce accurate center holes in components which require machining between centers. Sizes #0 to #000 are often referred to as Missile & Aircraft series.

Combined Drill and Countersinks - Solid Carbide page 119
Plain Type Solid Carbide Combined Drill and Countersinks are designed to produce accurate center holes in components which require machining between centers. Sizes #0 to #000 are often referred to as Missile & Aircraft series.

Combined Drill and Countersinks - High Speed Steel (Long Length) page 115
Long Length High Speed Steel Combined Drill and Countersinks provide access to areas where standard lengths will not reach.

Combined Drill and Countersinks - Bell Type page 115
Bell Type Combined Drill and Countersinks have an additional small 120 degree chamfer to protect the edges of the 60 degree hole.
COMBINED DRILL & COUNTERSINK SETS
5 Piece High Speed Steel Combined Drill and Countersink Set page 115
Sizes #1 to #5

5 Piece Titanium Nitride Coated Combined Drill and Countersink Set - (TiN) page 115
Sizes #1 to #5

5 Piece Cobalt Combined Drill and Countersink Set page 115
Sizes #1 to #5

5 Piece High Speed Steel Bell Type Combined Drill and Countersink Set page 115
Sizes #11 to #15
FLUTED COUNTERSINKS - HIGH SPEED STEEL
Zero Flute (Deburring) Countersink page 184
Zero Flute Countersinks are designed for countersinking and deburring operations. The single cutting edge removes stock quickly and prevents chatter.  They can be resharpened by using an Axial Relieving Fixture or by using a small mounted grinding wheel and inserting it into the hole.

Single Flute Countersink page 184
Single Flute Countersinks should be used when multi-flute countersinks chatter or the hole is too small for a multi-flute countersink to enter. Use for machine and portable work when operating at higher speeds. Drilled hold should be at least 10% of the diameter of the countersink.

Three Flute (Center Reamer) Countersink page 185
Three Flute Countersinks should be used at a slower (1/2 to 2/3 the speed used for drilling) speed. Recommended for machine and portable work. Because of their centering ability they are widely used in portable applications.

Four Flute (Machine) Countersink page 185
Four Flute Machine Countersinks have a longer shank for use in Turret lathes and for screw machine works.

Six Flute (Chatterless) Countersink page 186
Six Flute Countersinks are designed for fast shearing cuts.
INDEXABLE COUNTERSINKS
Indexable Countersinks page 187A
Indexable Countersinks are designed with a positive rake for smooth cutting without chatter. No tool resharpening needed. Uses standard triangle inserts that come with countersink.
LONG REACH (EXTRA LENGTH) COUNTERSINKS
Long Reach Countersinks - Single Flute page 187C
Single Flute Long-Reach Countersinks are used for difficult to reach tool and die work. The single flute is designed for chamfering and deburring holes too small for multi-flute countersinks.

Long Reach Countersinks - Six Flute page 187C
Six Flute Long-Reach Countersinks are used for difficult to reach tool and die work requiring fine finish cuts. The six cutting edges quickly center in hole and produce a smaller chip load.
COUNTERSINK SETS - 5 PIECE
ZERO FLUTE
60 Degree Zero Flute Countersink Set page 186
Set contains sizes #0, #1, #2, #3, #4

82 Degree Zero Flute Countersink Set page 186
Set contains sizes #0, #1, #2, #3, #4

90 Degree Zero Flute Countersink Set page 186
Set contains sizes #0, #1, #2, #3, #4

SINGLE FLUTE
60 Degree Single Flute Countersink Set page 186
Set contains sizes 1/4", 3/8", 1/2", 5/8", 3/4"

82 Degree Single Flute Countersink Set page 186
Set contains sizes 1/4", 3/8", 1/2", 5/8", 3/4"

90 Degree Single Flute Countersink Set page 186
Set contains sizes 1/4", 3/8", 1/2", 5/8", 3/4"

100 Degree Single Flute Countersink Set page 186
Set contains sizes 1/4", 3/8", 1/2", 5/8", 3/4"

THREE FLUTE
60 Degree Three Flute Countersink Set page 186
Set contains sizes 1/4", 3/8", 1/2", 5/8", 3/4"

82 Degree Three Flute Countersink Set page 186
Set contains sizes 1/4", 3/8", 1/2", 5/8", 3/4"

90 Degree Three Flute Countersink Set page 186
Set contains sizes 1/4", 3/8", 1/2", 5/8", 3/4"

100 Degree Three Flute Countersink Set page 186
Set contains sizes 1/4", 3/8", 1/2", 5/8", 3/4"

FOUR FLUTE
60 Degree Four Flute Countersink Set page 186
Sizes 1/2", 5/8", 3/4", 7/8", 1"

82 Degree Four Flute Countersink Set page 186
Sizes 1/2", 5/8", 3/4", 7/8", 1"

90 Degree Four Flute Countersink Set page 186
Sizes 1/2", 5/8", 3/4", 7/8", 1"

SIX FLUTE
60 Degree Six Flute Countersink Set page 186
Set contains sizes 1/4", 3/8", 1/2", 5/8", 3/4"

82 Degree Six Flute Countersink Set page 186
Set contains sizes 1/4", 3/8", 1/2", 5/8", 3/4"

90 Degree Six Flute Countersink Set page 186
Set contains sizes 1/4", 3/8", 1/2", 5/8", 3/4"
SOLID CARBIDE COUNTERSINKS
Single Flute Countersink page 187
Solid Carbide Single Flute Countersinks are used for softer materials.

Three Flute Countersink page 187
Solid Carbide Three Flute Countersinks are used for general purpose work.

Six Flute Countersink page 187
Solid Carbide Six Flute Countersinks are used for hardened steels and metals.