Drill bit GRAPHITE HSS cylindrical 4 mm for metal, model 55H018

GRAPHITE HSS cylindrical 4 mm drill bit is designed for efficient drilling in metal. Manufactured from high-speed steel (HSS), the 4 mm diameter cutting tool offers resistance to wear and elevated temperatures encountered during rotary drilling. The cylindrical shank fits standard chucks on hand drills and drill presses and is suitable for producing through-holes and pilot holes in steel, cast iron and non-ferrous metals during general metalworking, maintenance and repair operations.

Advantages

The HSS material ensures a balance between hardness and toughness for extended tool life when cutting metal. The cylindrical shank provides secure clamping and compatibility with a wide range of drills. The compact 4 mm diameter allows precise pilot hole creation and controlled drilling in thinner or softer metal sheets. Heat resistance of the tool material reduces premature dulling under typical drilling speeds.

Suitable for

• Drilling through-holes and pilot holes in steel and iron
• Working with non-ferrous metals such as aluminum and brass
• General metal fabrication and light maintenance tasks
• Use in hand drills and drill presses for workshop and site work

Key specifications

• Material: high-speed steel (HSS)
• Shank type: cylindrical
• Diameter: 4 mm
• Intended material: steel, iron, non-ferrous metals
• Typical applications: through-holes, pilot holes, general metalworking

How to use

Secure the drill bit in the chuck of a hand drill or drill press, ensuring the cylindrical shank is seated and tightened to prevent slippage. Mark the drilling point and, where accuracy is required, use a center punch to create a starting dent. Begin drilling at a slow to moderate speed, applying steady pressure; increase speed gradually while maintaining control and cooling when necessary. For thicker or harder metals, periodically withdraw the bit to clear chips and reduce heat buildup. After use, clean chips from the flutes and store the bit dry to avoid corrosion.

Usage recommendations

Use appropriate cutting fluid or lubricant when drilling steel to extend tool life and improve hole quality. Match drilling speed and feed pressure to the metal type—lower speeds for harder materials and higher speeds for softer non-ferrous metals. Wear proper eye protection and follow safe drilling practices.