Cylindrical Drill Bit Smart 4 x 75/40 by Smart — solid shank, 4 mm diameter, 75 mm overall length, 40 mm working length

Cylindrical Drill Bit Smart 4 x 75/40 is a solid-shank twist drill with a 4 mm cutting diameter, 75 mm overall length and 40 mm working length. It is designed for general drilling tasks in materials compatible with a standard cylindrical shank and 4 mm geometry. The bit fits common handheld drills and drill presses that accept a 4 mm shank and is intended for routine workshop use where precise small-diameter holes are required.

Advantages

This drill bit provides a compact, solid-shank design that simplifies installation in standard chucks. Its 4 mm diameter and 40 mm working length balance rigidity and reach for accurate hole placement in thin to moderate thickness workpieces. The 75 mm overall length offers extended clearance for deeper setups while remaining manageable in handheld or bench drilling operations.

Suitable for

• Drilling small-diameter holes in metal sheets and light structural parts
• Woodworking tasks requiring 4 mm pilot or through holes
• General workshop and maintenance drilling in plastics and composite materials compatible with twist drills

Key specifications

• Cutting diameter: 4 mm
• Overall length: 75 mm
• Working (flute) length: 40 mm
• Shank type: solid cylindrical shank suitable for standard chucks
• Tool type: twist drill suitable for drilling in metal, wood and compatible plastics

How to use

Secure the drill bit in the chuck so the shank seats fully and tighten according to the drill manufacturer's instructions. Select an appropriate speed for the material: higher speeds for wood and plastics, lower speeds and cutting fluid for ferrous metals. Start drilling with light pressure to establish a guide point, then apply steady pressure and withdraw periodically to clear chips. Use appropriate personal protective equipment and clamp the workpiece to prevent movement.

Usage recommendations

For metal drilling, use cutting fluid and lower speeds to reduce wear and improve hole quality; for wood and plastics, higher speeds and intermittent pecking can improve chip evacuation. Inspect the cutting edges before use and replace the bit when wear or deformation affects hole accuracy.