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What is Countersink Drill Bit

What is Countersink Drill Bit

2025-11-05

Definition

AMG countersink bit enlarges the top part of a drilled hole to match the shape of a screw head—typically 82°, 90°, or 100° angles.

Main Features

Angle: Commonly 82° (U.S. standard), 90° (Europe), or 100° (aircraft use).
Material: High-speed steel (HSS), cobalt, or tungsten carbide.
Shank type: Straight, hex, or quick-change.
Cutting edges: Usually 3–5 flutes for smooth finish and reduced chatter.

Advantages

Allows screws to sit flush or hidden for a neat appearance.
Prevents material from splitting when driving screws.
Improves load distribution and assembly strength.
Can remove burrs from drilled holes.

Applications

Woodworking and furniture assembly.
Metal fabrication.
Plastic component manufacturing.
Aerospace and automotive industries.