Drill bit Bosch HSS-G 135° 5.5 mm x 57 mm, single piece

Bosch HSS-G 135° twist drill bit, 5.5 mm diameter and 57 mm overall length, supplied as a single piece. Manufactured from high-speed steel (HSS) with a 135° split point geometry to improve centering and reduce walking when starting holes. Designed for drilling into metal and steel as well as other hard materials using handheld and machine drills. Suitable for workshop, repair and fabrication tasks where precision cutting and tool life are important.

Advantages

The HSS material provides good heat resistance and wear performance under typical metal-drilling conditions. The 135° split point reduces the tendency to wander on contact and allows for faster penetration on flat surfaces without the need for pre-centering. The 57 mm overall length gives an adequate reach for standard through-hole and partial-depth drilling in sheet and plate materials. As a single-piece supply, it is convenient for replacement or to keep an individual drill in a common size for routine tasks.

Suitable for

• Drilling holes in metal and steel sheets and plates
• Workshop maintenance and repair operations
• Fabrication and assembly where precise centering is required
• Use in handheld drills and drill presses for routine tasks

Key specifications

• Material: High-speed steel (HSS)
• Tip geometry: 135° split point for reduced walking
• Diameter: 5.5 mm
• Overall length: 57 mm
• Pack type: Single piece

How to use

Select an appropriate drill speed for the material being drilled and secure the workpiece to prevent movement. Mark the hole position and, if required, use a centre punch for improved accuracy. Fit the 5.5 mm Bosch HSS-G drill bit into the drill chuck and tighten securely. Apply steady, moderate pressure and keep the drill perpendicular to the surface. For metal drilling, use cutting fluid or lubricant to reduce heat and prolong bit life. Withdraw the bit periodically to clear chips and prevent clogging.

Usage recommendations

Use lower speeds and appropriate cutting fluid when drilling hard steels; avoid excessive side loads and overheating. Store the drill bit in a dry place and inspect for wear or chipping before reuse. Replace when the point becomes blunt or when chipping reduces hole quality.