Drill bit GRAPHITE HSS cylindrical for metal 4.2 mm (55H019)

GRAPHITE HSS cylindrical drill bit with a 4.2 mm working diameter is engineered for precise metal drilling. Manufactured from high-speed steel (HSS), this straight-shank bit provides wear resistance and maintains cutting performance at elevated temperatures. It is intended for use in handheld drills and drill presses when creating through-holes, preparing fittings for fasteners, or carrying out general metal fabrication operations.

Advantages

The HSS composition offers good hardness and heat tolerance during continuous drilling in ferrous and non-ferrous metals. The cylindrical (straight) shank ensures secure clamping in standard chucks, while the 4.2 mm diameter delivers a balance between hole accuracy and material removal rate. Designed for dimensional stability and consistent cutting life, the bit suits repetitive workshop tasks and occasional on-site repairs.

Suitable for

• Drilling through steel, stainless steel and cast iron (with appropriate speeds and coolant)
• Creating holes in non-ferrous metals such as aluminum, brass and copper
• General metal fabrication, fitting fasteners and creating clearance holes
• Use in handheld electric drills and bench drill presses

Key specifications

• Material: High-speed steel (HSS)
• Shank type: Cylindrical / straight shank
• Nominal diameter: 4.2 mm
• Intended application: Metal drilling (ferrous and non-ferrous)
• Compatibility: Standard drill chucks for cylindrical shanks

How to use

Secure the drill bit in the chuck so the shank is fully seated and tighten the chuck firmly. Select an appropriate spindle speed for the metal being drilled (lower speeds for stainless steel and higher speeds for softer non-ferrous metals) and, where possible, use cutting fluid or coolant to reduce heat and extend tool life. Apply steady feed pressure and avoid excessive side loading; withdraw the bit periodically for chip clearance on deeper holes. After use, clean chips from flutes and store the bit in a dry place to prevent corrosion.

Usage recommendations

For best results when drilling hard or stainless steels, use lower rotational speeds, a suitable cutting lubricant, and intermittent pecking to avoid work hardening. When drilling soft non-ferrous metals, higher speeds with light feed will reduce cutting forces and improve surface finish.