Drill bit Proline 91240 — 12 mm diameter, 400 mm length, metal, 1 pc

Proline 91240 is a single metal drill bit with a 12 mm diameter and a 400 mm overall length designed for drilling metal. Intended for extended-reach applications, this drill bit enables through-holes and deep drilling in steel and other metals. It is compatible with hand-held drills and drill presses where extra length is required and is supplied as a single piece.

Advantages

The solid metal construction and extended 400 mm length deliver reliable access to deep or hard-to-reach work areas. The bit’s geometry is optimized to provide accurate centered drilling and reduced axial load during cutting, improving bit life and drill stability. Suitable for typical workshop and on-site tasks, the single-piece supply simplifies inventory and replacement.

Suitable for

• Drilling through-holes in steel plates and sections
• Deep hole drilling where standard-length bits are insufficient
• Use with portable electric drills and drill presses

Key specifications

• Diameter: 12 mm
• Overall length: 400 mm
• Material application: metal (steel and similar metals)
• Supply quantity: 1 piece
• Shank type: compatible with standard drill chucks

How to use

Secure the drill bit firmly in the drill chuck, ensuring correct alignment and adequate chuck grip. Mark and center-punch the drilling point on the workpiece to maintain accuracy. Use appropriate cutting speed and steady feed for the metal being drilled, apply cutting fluid or lubricant when required to reduce heat and prolong bit life, and withdraw periodically to clear chips when drilling deep holes. Maintain steady pressure without forcing the bit to avoid breakage.

Usage recommendations

For best results in metalworking, use a suitable cutting lubricant, select drill speeds appropriate for the material thickness, and clamp the workpiece securely. Inspect the bit before use for wear or damage and replace if signs of excessive wear or chipping are present.