Mũi doa vát mép, HSS-G, 8,3

This product is a Mũi doa vát mép. It is a countersinking tool in bit form, specially developed to drill conical depressions (countersinks) into workpieces.

What it can do:

• Chamfering: Cleanly break or chamfer edges.
• Deburring: Remove sharp burrs that arise during drilling or machining.
• Countersinking for screw heads: The main application is creating a conical recess into which the head of a countersunk screw (e.g., according to DIN 965 or 7991) can be flush with the workpiece surface. This prevents the screw head from protruding and creates a flat surface.
• Clean surfaces: Thanks to its three cutting edges and HSS-G quality, the countersink produces smooth and clean countersinks without chattering.

Where it is used:

• Woodworking: Ideal for countersinking screw heads in wood, particle board, MDF, etc.
• Metalworking: Suitable for thin sheets, profiles, or soft metals like aluminum, copper, brass, and also unalloyed/low-alloy steels.
• Plastics processing: For deburring and chamfering plastic parts.
• Furniture making, model building, general workshop tasks: Wherever screws need to be countersunk flush or edges need to be cleanly finished.
• In combination with: Cordless drills, electric drills, or stationary drilling machines, as it has a standardized 1/4" hex shank that fits directly into corresponding tool holders.

Countersinks are cutting tools used to drill conical (cone-shaped) countersinks into a workpiece.

• Conical Shape: Their main feature is the tapered cutting surface at the tip.
• Angle: They are available in various countersinking angles (e.g., 60°, 82°, 90°, 120°). This countersink has a 90° anglewhich is the standard for metric countersunk screws.
• Number of Cutting Edges: They can have one, three, or more cutting edges. This Mũi doa vát mép has 3 cutting edgeswhich ensures good cutting performance, stability, and a clean cut.

They are used to:

• Create countersunk holes for screw heads (e.g., for countersunk screws).
• Deburr the edges of drilled holes, i.e., remove sharp burrs that arise during drilling.
• Apply chamfers to the mouths of drilled holes, for example, to facilitate the insertion of screws or pins or to create visually appealing edges.

HSS-G stands for High Speed thép, Ground.

• HSS: This is an alloyed tool thép known for its high hardness and toughness at elevated temperatures. It is the standard material for many cutting tools because it allows for high cutting speeds without losing its hardness.
• "G" (Ground): The "G" suffix means that the cutting surfaces, flutes, and often the diameter of the tool are precision-ground. This leads to several advantages:
  • Sharper Cutting Edges: The ground surface creates extremely sharp cutting edges, which results in a clean cut and lower cutting forces.
  • Higher Dimensional Accuracy: Ground tools are more precise in their dimensions, which is important for dimensionally accurate countersinks.
  • Improved Chip Evacuation: The smooth surface of the flutes facilitates the removal of chips.
  • Longer Tool Life: Reduced friction and improved cutting edge quality contribute to a longer tool life.

HSS-G tools are an excellent choice for use in well-machinable materials and offer a good balance of performance and cost, especially when precision and a clean result are required.

1. What exactly do I need a 90° countersink for?

A 90° countersink is mainly used to create a conical recess for metric countersunk screws so that they sit flush with the surface. However, it is also excellent for deburring or chamfering sharp edges on drilled holes.

2. What does the material HSS-G mean?

HSS-G stands for "High Speed thép, Ground." The "G" means that the cutting surfaces are precisely ground. The result is sharper edges, higher dimensional accuracy, and a longer tool life compared to unground (roll-forged) tools.

3. What materials is this bit suitable for?

This Mũi doa vát mép is designed for use in well-machinable materials such as wood, particle board, MDF, plastics, and soft metals (aluminum, brass, copper). It can also be used for thép không hợp kim và thép hợp kim thấp.

4. Why does the countersink have 3 cutting edges?

The three cutting edges ensure better centering and higher stability during the countersinking process. Unlike single-flute countersinks, which can tend to chatter in hard materials, the three cutting edges create a significantly smoother and cleaner cut.

5. Does the bit fit in every cordless drill?

Yes, the 1/4-inch hex shank is a standardized size that fits into almost all common cordless drills, bit holders, and drilling machines with the corresponding chuck. This gives you great flexibility in its use.