What is Countersink Drill Bit

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.

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.