KWB 258040 HSS Twist Drill Bit 4 mm

The KWB 258040 HSS twist drill bit is a professional-grade tool engineered for precision and durability. With a 4 mm diameter and a 75 mm total length, this high-performance drill bit features a robust HI-NOX HSS M2 construction. Its design includes a 130° point angle with a special polished section and a unique Quick Cut geometry, which facilitates efficient swarf removal and clean hole formation. The bit is finished in a black, uncoated surface and is designed for right-hand rotation, making it a reliable choice for demanding drilling applications in various metal types.

Advantages

This drill bit offers exceptional heat resistance and structural integrity, thanks to its reinforced core and spiral shoulder. The specialized Quick Cut geometry ensures that swarf is broken into small pieces, preventing clogging and allowing for faster, more energy-efficient drilling. Because of its robust design and high-quality material composition, it maintains optimal cutting performance even when working with challenging materials like stainless steel. The short spiral notch further enhances stability, ensuring that the bit remains steady during operation with both cordless and corded power tools.

Suitable for

• Drilling into all types of stainless steel
• General metalworking tasks
• Working with cast iron and cast steel
• Standard steel drilling applications

When it may not be suitable

This drill bit is specifically optimized for metalworking and may not provide the best results when used on soft materials like wood or plastic, where different flute geometries are typically preferred. It is also not intended for use in masonry or concrete drilling.

Key specifications

• Diameter: 4 mm
• Total length: 75 mm
• Material: HI-NOX HSS M2 steel
• Point angle: 130°
• Rotation: Right-hand cut
• Design: Cylindrical shank

How to use

To use the KWB 258040 drill bit, insert the cylindrical shank into a compatible geared chuck or keyless chuck of your power drill. Ensure the bit is tightened securely before starting the machine. Position the drill point at the desired location and apply steady, moderate pressure while maintaining a consistent speed. For best results in stainless steel, use a lower RPM and appropriate cooling lubricant to extend the life of the bit and ensure a clean finish.

What to consider before purchase

• Verify that your drill chuck supports a 4 mm cylindrical shank.
• Ensure the material you are drilling is compatible with HSS M2 steel.
• Consider using a center punch to mark the drilling spot to prevent the bit from wandering.

Usage recommendations

For optimal performance and longevity, always use a suitable cutting oil when drilling into stainless steel or hard metals to reduce friction and heat buildup.