Drill bit Proline 72640 — metal drill bit 26 mm, length 400 mm, 1 pc

Proline 72640 is a single metal drill bit with a 26 mm diameter and 400 mm overall length, supplied as one piece. Designed for drilling in metal, it is suitable for both handheld and stationary drills and intended for creating through-holes, enlarging openings, or preparing workpieces in metal fabrication and repair tasks. The bit's geometry is optimised for metal cutting and stable drilling performance during extended use.

Advantages

The 26 mm diameter and 400 mm length provide reach and capacity for deeper holes and thicker workpieces while remaining compatible with common drill chucks and arbors. A double-twist flute design promotes efficient chip evacuation and helps maintain bore stability. The four-blade insert geometry is optimised to reduce walking and improve centring when starting holes in metal surfaces.

Suitable for

• Drilling through-holes in steel and non-ferrous metals
• Enlarging existing openings in metal components
• Metal fabrication and repair tasks requiring deep or long-reach holes
• Use with handheld or bench-mounted drilling machines

Key specifications

• Diameter: 26 mm
• Overall length: 400 mm
• Material suitability: designed for metal drilling
• Flute type: double-twist design for chip evacuation
• Cutting geometry: 4-blade insert with optimised geometry
• Quantity: 1 piece

How to use

Secure the drill bit firmly in the chuck or appropriate arbor, ensuring concentric alignment. Select a drill speed suited to the metal type and bit diameter; lower speeds are generally recommended for larger diameters and harder metals. Use cutting fluid to reduce heat and improve chip removal during drilling. Apply steady, even pressure and allow the bit to cut without forcing; periodically withdraw the bit to clear chips from the flutes when drilling deep holes.

Usage recommendations

For best performance and tool life, use appropriate cutting lubricant, clamp the workpiece securely, and start holes with a suitable pilot or centre punch if necessary to prevent walking. Inspect the bit before use for wear or damage and replace when cutting performance decreases.