Drill bit Proline 12 mm x 350 mm model 71235, metal, 1 pc

Proline 12 mm x 350 mm model 71235 is a single metal drill bit designed for drilling metal where extended reach or through-holes are required. The bit has a 12 mm cutting diameter and an overall length of 350 mm with a straight shank suitable for standard chucks. It is intended for workshop and construction use on metal sheets, pipes and profiles that need deeper penetration or contact from a single-sided approach.

Advantages

This Proline drill bit offers a long working length for deep or hard-to-reach holes while maintaining a consistent 12 mm bore size. The straight shank ensures compatibility with common chucks and drilling machines. The geometry is designed for effective metal cutting, delivering straight holes with reduced walking at the start and stable drilling performance across thicker sections.

Suitable for

• Drilling through metal sheets and plates
• Creating holes in metal pipes and tubing
• Producing deeper holes in structural profiles and beams
• Workshop and on-site metal fabrication tasks

Key specifications

• Cutting diameter: 12 mm
• Overall length: 350 mm
• Material application: metal
• Shank type: straight shank for standard chucks
• Quantity: 1 piece

How to use

Secure the drill bit in a compatible drill chuck and set the drill to a speed appropriate for the metal being worked (lower speeds for harder metals). Clamp or secure the workpiece to prevent movement. Mark the drilling point and, if needed, create a small pilot dimple with a center punch to reduce bit walking. Apply steady, even pressure and allow the bit to cut without forcing; withdraw periodically to clear chips and reduce heat buildup.

Usage recommendations

Use cutting fluid or lubricant when drilling thicker or harder metals to extend tool life and improve chip evacuation. Start at a controlled speed and adjust feed to maintain a clean hole. Inspect the bit for wear before use and replace if cutting edges are damaged.