Drill bit for metal Tvardy HSS DIN1869 long 8.5 x 305 mm

Drill bit for metal Tvardy HSS DIN1869 long 8.5 x 305 mm is a high-speed steel drilling tool manufactured to DIN1869 specifications. With an 8.5 mm cutting diameter and overall length of 305 mm, this long-shank drill bit is intended for drilling through a variety of metal materials where extended reach or deep holes are required. The design supports use in both hand-held and machine-mounted drilling operations, providing access to confined or recessed workpieces while maintaining rigidity and cutting performance typical of HSS tooling.

Advantages

The HSS material provides good toughness and heat resistance for sustained cutting in metal, while the DIN1869 geometry ensures consistent chip formation and reliable centering. The long 305 mm overall length reduces the need for extensions or special setups when reaching deep or awkward locations. The 8.5 mm diameter balances cutting stability with sufficient hole size for many fabrication and maintenance applications.

Suitable for

• Drilling through steel, cast iron and non-ferrous metals
• Creating deep holes in sheet assemblies or structural components
• Maintenance, repair and overhaul tasks requiring extended reach
• Machine-mounted or hand-held drilling where long shank is needed

Key specifications

• Material: high-speed steel (HSS)
• Standard: DIN1869 geometry
• Cutting diameter: 8.5 mm
• Overall length: 305 mm (long shank)
• Suitable for use in hand-held drills and drill presses

How to use

Secure the drill bit in a compatible chuck ensuring adequate clamping depth on the long shank to prevent flex. Select an appropriate cutting speed and feed rate for the metal being drilled; reduce speed for harder materials and increase for softer non-ferrous metals. Use cutting fluid or lubricant when drilling steel or other ferrous metals to improve heat dissipation and extend tool life. Start with a center punch or pilot mark for accurate positioning, and apply steady pressure while allowing the tool to cut without excessive force.

Usage recommendations

For best results, match drilling speed and lubrication to the workpiece material, ensure the long shank is well supported in the chuck, and clear chips frequently to avoid clogging and overheating. Replace the bit if wear or chipping appears on the cutting edges to maintain hole quality and operator safety.