Drill bit Abraboro HSS-Co 5.5 mm x 93 mm usable length for metal

Abraboro HSS-Co 5.5 mm x 93 mm usable length metal drill bit is designed for reliable drilling of ferrous and non-ferrous metals. Made from cobalt-alloyed high-speed steel (HSS-Co), the bit offers improved heat resistance and extended wear life compared with standard HSS. The 5.5 mm diameter and 93 mm usable length provide a balance of rigidity and reach for common metalworking operations using hand drills or drill presses.

Advantages

The cobalt-alloyed HSS construction increases hardness at elevated temperatures, reducing wear during prolonged drilling in hard materials. A precisely ground point geometry improves centring and reduces walking on metal surfaces, helping to produce clean, accurately sized round holes. The 93 mm usable length gives sufficient penetration for through-holes in sheet, plate and medium-thickness components while maintaining stability during operation.

Suitable for

• Drilling holes in mild steel, stainless steel, aluminum and other non-ferrous metals
• Maintenance, repair and fabrication tasks in workshops and on-site
• Use with handheld electric drills and bench drill presses
• Creating clearance and pilot holes for fasteners and assemblies

Key specifications

• Material: cobalt-alloyed high-speed steel (HSS-Co)
• Diameter: 5.5 mm
• Usable length: 93 mm
• Tip style: split/precision ground point for improved centring
• Shank type: straight shank compatible with standard chucks
• Intended use: drilling ferrous and non-ferrous metals

How to use

Secure the workpiece and choose appropriate clamping to prevent movement. Select correct speed and feed for the metal being drilled—lower speeds for harder materials such as stainless steel and higher speeds for softer metals like aluminum. Use a properly tightened chuck to hold the straight shank and apply steady, moderate pressure during drilling. Periodically withdraw the drill to clear chips and reduce heat build-up; apply cutting fluid or coolant when drilling harder or thicker materials to extend tool life and improve surface finish.

Usage recommendations

For best results, match drill speed and cutting fluid to the work material: use slower spindle speeds and lubricant for hard steels, and higher speeds with light lubrication for softer alloys. Inspect the bit for wear or chipping before use and replace when cutting performance deteriorates to maintain hole accuracy and operator safety.