Drill bit KWB 511820 — spiral cutting drill bit, diameter 20 mm, 1 piece

KWB 511820 is a spiral cutting drill bit with a 20 mm diameter supplied as a single piece. Designed for use with standard drills, this wood drill bit features a single spiral flute and a centre point with two cutting wings to ensure precise, break-out free holes in soft and hardwoods. The bit is made of chromium-vanadium (CrV) steel with a chemical black finish and chamfer ground cutting edges. With a length of 250 mm and a cylindrical shank, it is intended for extra-long drilling tasks in beams and other wooden workpieces.

Advantages

The KWB 511820 combines industrial-quality materials and geometry: accurately formed CrV steel provides durability while the centre point and two cutting wings ensure accurate positioning and clean hole exits. The single spiral flute removes chips efficiently along the bit body, reducing clogging during deep drilling. The chamfer-ground cutting edges and chemical black surface treatment contribute to consistent cutting performance and corrosion resistance.

Suitable for

• Drilling through softwoods and hardwoods
• Creating clean through-holes in beams and structural timber
• Long-reach drilling for joinery and carpentry tasks
• DIY repair and woodworking projects where a 20 mm spiral bit is required

Key specifications

• Drill bit type: spiral cutting wood bit with centre point and two cutting wings
• Diameter: 20 mm
• Overall length: 250 mm
• Material: chromium-vanadium (CrV) steel
• Shank type: cylindrical
• Finish: chemical black
• Cutting geometry: chamfer-ground edges, single spiral flute
• Quantity: 1 piece

How to use

Secure the KWB 511820 in the drill chuck ensuring the cylindrical shank is held firmly. Mark the drilling position and align the centre point for accurate start-up. Apply steady axial pressure and run the drill at an appropriate speed for the wood species being drilled—lower speeds for hardwoods, medium speeds for softwoods. Withdraw the bit periodically on deep holes to clear chips and avoid overheating. After use, clean off wood chips and store the bit in a dry place.

Usage recommendations

Use appropriate personal protective equipment such as safety glasses and hearing protection. For best results in hardwood and long-reach drilling, use moderate feed pressure and avoid excessive speed to extend tool life. If drilling through treated or abrasive materials, check the bit for wear regularly and replace when cutting performance declines.