Centering bit set for crown drills HOGERT HT6D462, Bi-metal, Ø14–30 mm, hex 3/8"

The HOGERT centering bit set HT6D462 is a bi‑metal crown drill kit designed for cutting clean circular holes with diameters from 14 mm to 30 mm. Each cutter features a centering pilot and a 3/8" hex shank that fits into compatible chucks or quick‑change adapters, providing stable engagement during drilling. The bi‑metal construction combines flexibility and hardness to extend tool life when working with thin metals and a variety of other materials commonly encountered in workshops and professional settings.

Advantages

Bi‑metal construction offers improved wear resistance and toughness compared with simple high‑speed steel, helping to resist chipping when cutting through sheet metal. The centering pilot ensures accurate hole placement and reduces walking on the workpiece. A 3/8" hex shank secures the cutter in hex‑drive chucks or adapters for consistent torque transfer. The included range of diameters from 14 mm to 30 mm covers many standard hole sizes for installations and fabrications, lowering the need to change tools frequently.

Suitable for

• Cutting circular holes in thin sheet metal and plated surfaces
• Electrical and HVAC panel work requiring precise openings
• Metal fabrication, maintenance and repair tasks
• Wood, plastics and composite materials where bi‑metal cutters are appropriate

Key specifications

• Material: bi‑metal cutting edges
• Diameter range: 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm
• Shank type: 3/8" hex
• Centering pilot included for each cutter
• Intended thickness: optimized for thin metals and general workshop materials

How to use

Fit the 3/8" hex shank into a compatible drill chuck or hex‑drive adapter and tighten securely. Mark the center of the required hole on the workpiece and position the centering pilot against that mark. Start drilling at low speed to allow the pilot to engage and then increase speed and apply steady, even pressure to let the bi‑metal cutter do the work. Use cutting lubricant when drilling ferrous metals to reduce heat and extend tool life. After cutting, remove burrs as needed for a clean finish.

Usage recommendations

Use appropriate personal protective equipment, clamp the workpiece firmly to prevent movement, and select cutting speed and lubrication according to the material. Avoid excessive axial force to prevent premature wear of the cutter and pilot.