Drill bit GRAPHITE 57H140 for metal, titanium-coated, cylindrical shank, 6.5 mm

GRAPHITE drill bit model 57H140 is a cylindrical-shank metal drill bit with a 6.5 mm cutting diameter and a titanium coating. Designed for drilling steel and other metals, its titanium finish increases surface hardness and improves heat dissipation during cutting operations. The shank fits standard chucks on handheld drills and drill presses, making this bit suitable for workshop, construction and general maintenance use.

Advantages

The titanium coating enhances wear resistance and helps maintain cutting sharpness for longer operating times. The cylindrical shank ensures secure mounting in standard chucks and consistent concentricity during drilling. A 6.5 mm diameter provides a precise through-hole size for fasteners and fittings commonly used in metalwork. The bit is balanced for typical drilling speeds and compatible with both portable drills and stationary drilling machines.

Suitable for

• Drilling holes in steel and non-hardened metals
• Workshop repairs and machinery maintenance
• Construction and installation tasks requiring metal fastener holes
• Use with handheld drills and drill presses

Key specifications

• Cutting diameter: 6.5 mm
• Coating: titanium
• Shank type: cylindrical
• Material application: steel and other metals

How to use

Select appropriate drill speed for the metal being machined, secure the cylindrical shank in the drill chuck, and use cutting fluid or coolant when drilling harder steels to reduce heat buildup. Apply steady, moderate pressure and withdraw the bit periodically to clear chips and prevent clogging. For through-holes, clamp the workpiece to prevent movement; for blind holes, monitor depth and back off occasionally to clear chips.

Usage recommendations

For prolonged tool life, keep the drilling area lubricated with suitable cutting oil, avoid excessive feed pressure and high speed when drilling hardened materials, and inspect the bit for wear; replace when cutting becomes inefficient or if chipping of the coating occurs.