Drill bit for metal Tvardy 10.0 x 430 mm HSS long, DIN1869

Long HSS metal drill bit Tvardy 10.0 x 430 mm, manufactured to DIN1869, is designed for deep and through-hole drilling in steel and other ferrous materials. With a 10.0 mm cutting diameter and 430 mm overall length, this HSS drill bit provides the extended reach required for machining thicker parts, working on assemblies with restricted access, or producing long clean holes in metalwork. Conforming to DIN1869 ensures consistent geometry and shank dimensions for compatibility with common drill chucks and holders.

Advantages

This high-speed steel (HSS) construction offers good hardness and heat resistance for sustained metal drilling operations at moderate cutting speeds. The long 430 mm length enables access to deep workpieces and through-holes without the need for extensions or special tooling. Manufactured to DIN1869, the bit maintains standardised tip and shank geometry for reliable centring, stable cutting performance, and easier tool changes in standard chucks and holders.

Suitable for

• Through-hole and deep drilling in steel and other ferrous metals
• Metal fabrication, repair and maintenance tasks
• Workpieces with limited access or recessed holes
• Workshop and site drilling where extended reach is required

Key specifications

• Material: High-speed steel (HSS)
• Diameter: 10.0 mm cutting diameter
• Overall length: 430 mm
• Standard: Manufactured to DIN1869
• Tip geometry: Conventional HSS twist drill profile suitable for metal
• Shank type: Straight shank compatible with standard chucks and holders

How to use

Secure the drill bit in a compatible chuck or holder ensuring correct alignment and sufficient clamping length on the shank. Mark and, if necessary, centre-punch the drilling position to improve accuracy. Use appropriate cutting speed and feed for HSS in ferrous metals, apply cutting fluid to reduce heat and improve chip evacuation, and back the bit out periodically when drilling deep holes to clear chips. Maintain steady pressure and avoid excessive side loads to prolong tool life.

Usage recommendations

For best results, use moderate spindle speeds suitable for 10.0 mm HSS drills in steel, keep the bit well-lubricated with cutting oil, and remove chips frequently when drilling to full depth. Ensure your drill or machine has sufficient rigidity and chuck capacity for a 430 mm long bit — using a support or guide can improve accuracy and reduce vibration.