Drill bit Proline 91421 — 14 mm diameter, 210 mm length, metal drill bit, 1 pc

Proline 91421 is a single metal drill bit with a 14 mm diameter and a 210 mm overall length, intended for drilling metal and other ferrous materials. This one-piece metal drill bit is compatible with bench drills and handheld drills that accept its shank size and provides a solution for medium-depth holes in steel, iron and similar materials. The design balances cutting performance and centering stability to support metalworking, maintenance and fabrication tasks.

Advantages

The Proline 91421 drill bit features a solid metal construction that offers consistent geometry and reliable centering for clean holes. Its 14 mm diameter and 210 mm length deliver reach for medium-depth drilling while maintaining stiffness to reduce deflection. The bit is designed for use in steel and other ferrous materials and is supplied as a single piece for straightforward replacement and inventory management.

Suitable for

• Drilling medium-depth holes in steel and iron components
• General metalworking and fabrication tasks
• Maintenance and repair operations requiring through or blind holes
• Use with bench drills and handheld drills with compatible chucks

Key specifications

• Diameter: 14 mm
• Overall length: 210 mm
• Material/application: designed for drilling metal and ferrous materials
• Quantity: 1 piece
• Tip/geometry: double twist for chip evacuation and centered drilling

How to use

Secure the Proline 91421 drill bit firmly in the drill chuck and ensure the drill speed and feed are appropriate for the metal being drilled. Mark the drilling point and, if precision is required, create a center punch indent before starting. Use coolant or cutting oil as recommended for the workpiece material to reduce heat and extend tool life. Apply steady pressure and allow the drill to cut without forcing; withdraw occasionally to clear chips if drilling deep holes.

Usage recommendations

For best results in steel and other ferrous materials, select drill speeds and cutting fluids suitable to the material thickness and hardness. When using handheld drills, maintain a stable position and clamp the workpiece to prevent movement. Replace the bit if signs of wear appear to avoid poor hole quality and increased load on the drill.