Twist drill bit Bosch HSS hex-shank 4 mm

Twist drill bit Bosch HSS hex-shank 4 mm is a high-strength HSS metal drill designed for precise drilling in metal and suitable for wood. The 4 mm diameter and 1/4-inch (6.35 mm) hex shank provide secure clamping in chucks and impact drivers, while an oxide-coated flute reduces wear. The bit is manufactured to DIN 338, Type N flute geometry, with a 135° split-point tip and diameter tolerance h8 for accurate centring and cutting.

Advantages

The solid HSS construction and precision grinding give long life and consistent cutting performance. An oxide-coated flute improves chip evacuation and wear resistance. The 135° split-point tip ensures active cutting and reliable self-centring, reducing walking on the workpiece. The 1/4-inch hex shank allows quick, slip-free insertion into standard chucks and impact driver adapters.

Suitable for

• Drilling holes in metal sheets, steel and non-ferrous metals
• Light woodworking and drilling in composite materials
• Use with impact drivers, cordless drills and drill chucks that accept 1/4-inch hex shanks

Key specifications

• Brand: Bosch
• Material: High-speed steel (HSS)
• Shank: 1/4-inch (6.35 mm) hex
• Diameter: 4 mm
• Tip angle: 135° split-point
• Flute finish: Oxide-coated
• Standard: DIN 338, Type N
• Diameter tolerance: h8
• MPN: 2608577052
• EAN: 3165140858809

How to use

Mark the drilling point and clamp the workpiece securely. Fit the 4 mm Bosch HSS hex-shank drill bit into the chuck or impact-driver adapter until it seats firmly. Start drilling at low speed to establish the centre, then increase speed appropriate to the material while applying steady feed pressure. Use cutting fluid when drilling steel to reduce heat and extend tool life. Clear chips regularly to avoid clogging the flute.

Usage recommendations

For best results in metal, use cutting lubricant and moderate speed; ensure the workpiece is well supported to prevent bit breakage. Replace the bit when wear or dulling increases cutting force or decreases hole accuracy.