Twist drill bit Bosch Metal drill bit HSS-G DIN 340 diameter 3.5 mm

The Bosch Metal drill bit HSS-G DIN 340 with a 3.5 mm diameter is a high-speed steel twist drill designed for precision drilling in metal. Manufactured to DIN 340 and featuring a Type N, right-hand cutting geometry with a 135° split-point tip per DIN 1412 C, this solid-ground drill delivers accurate holes with controlled chip removal. The oxide-coated surface improves chip evacuation while the shank equals the drill diameter for secure clamping.

Advantages

This HSS-G twist drill bit provides high wear resistance and thermal stability typical of high-speed steel. The 135° split-point tip reduces walking and enables precise hole positioning without the need for pre-spotting. The oxide-coated finish enhances chip flow and reduces adhesion of swarf, while the diameter tolerance h8 ensures consistent hole sizes. The fluted two-cutter design with two helical flutes supports efficient cutting and evacuation.

Suitable for

• Drilling holes in steel and other ferrous metals
• General metalworking and fabrication tasks
• Workshop and on-site drilling where precision is required

Key specifications

• Brand: Bosch
• Type: Metal drill bit HSS-G (DIN 340)
• Diameter: 3.5 mm
• Tip angle: 135°, split point (DIN 1412 C)
• Cutting direction: Right-hand
• Tolerance: h8
• Shank: Equal to drill diameter
• Finish: Oxide-coated surface
• Flutes: Two helical flutes (two-cutter)
• Packaging: Polished in packs of 1, black in packs of 5
• MPN: 2 608 595 678
• EAN: 3165140417976

How to use

Secure the workpiece and select an appropriate drill speed for the metal being drilled (lower speeds for harder steels). Clamp the drill bit in the chuck with the shank seated fully. Use steady, moderate feed pressure and allow the drill to cut without excessive force. Periodically withdraw the drill to clear chips and maintain cooling—use cutting fluid when drilling tougher or thicker materials to extend tool life.

Usage recommendations

For best results, start with a pilot or centre punch to prevent walking on smooth surfaces, choose speeds suited to the material, and apply cutting fluid for improved tool life and chip evacuation when drilling structural steels or thick sections.