Drill bit Irwin HSS cylindrical 4 mm for metal, model 10502486

Irwin HSS cylindrical drill bit 4 mm is engineered for precise drilling in metal. Constructed from high-speed steel (HSS), this 4 mm diameter bit offers heat resistance and wear performance suited to conventional metalworking. The cylindrical shank is compatible with standard chucks and drill presses, enabling straightforward installation and reliable concentricity for through-holes in steel, iron and non-ferrous metals.

Advantages

The high-speed steel material provides a balance of hardness and toughness that reduces edge wear and maintains cutting performance at elevated temperatures. The 4 mm diameter ensures controlled chip formation and accurate hole sizes, while the cylindrical shank simplifies clamping in bench drills and portable drills with standard chucks. The bit’s geometry is optimized for metal cutting to achieve cleaner hole walls and consistent penetration.

Suitable for

• Drilling through mild and medium-hard steels
• Creating holes in iron and cast iron components
• Working with non-ferrous metals such as aluminium and copper
• General metal fabrication and maintenance tasks
• Workshop use with drill presses and hand drills

Key specifications

• Material: high-speed steel (HSS)
• Diameter: 4 mm
• Shank type: cylindrical (straight) shank for standard chucks
• Intended application: metal drilling, through-holes
• Suitable materials: steel, iron, non-ferrous metals

How to use

Select a compatible drill chuck and securely clamp the cylindrical shank to minimize runout. Mark the drilling position and use a center punch for accurate starts on flat metal surfaces. Start at a low speed to establish the hole, then increase speed according to the material and drill press or handheld drill capability. Apply steady feed pressure and use cutting fluid or coolant for improved tool life and chip evacuation when drilling tougher steels. Retract periodically on deep holes to clear chips and avoid overheating.

Usage recommendations

For best results, match drilling speed and feed to the workpiece: lower speeds for harder steels, higher speeds for softer non-ferrous metals. Use cutting fluid when drilling steels to extend life of the HSS bit and improve surface finish. Inspect the bit for wear or chipping before use and replace when cutting performance degrades.