Countersink drill bit Wera 05104633001 — diameter 1.24 cm, for drilling and countersinking

Wera 05104633001 is a 1.24 cm diameter countersink drill bit designed for drilling, deburring and creating precise 90° countersinks. The tool features a 3-flute cutting geometry with a combined drill and countersink profile that produces a clean entry hole and a recessed seat for fastener heads. Manufactured to close tolerances, the bit provides reliable chip evacuation and reduced tilting during operation, and it is intended for use with compatible 1/4" hex shank holders that accept D 6.3 take-up.

Advantages

The 3-cutter design follows DIN 335-C geometry at a 90° angle, delivering consistent countersink profiles and smooth chamfering. Material elasticity and heat-treated finishing increase durability while maintaining cutting performance. Optimized flute geometry helps evacuate chips efficiently, reducing clogging and keeping the working surface cleaner. The 1/4" hex shank enables quick insertion and secure retention in standard bit holders, ensuring stable operation and minimal wobble.

Suitable for

• Drilling and countersinking pilot holes in metal
• Deburring and chamfering edges on workpieces
• Joinery operations requiring a 90° countersink for flat fastener heads
• General workshop and maintenance tasks with compatible drills and holders

Key specifications

• Countersink diameter: 1.24 cm
• Cutter geometry: 3-flute, 90° countersink profile
• Suitable shank type: 1/4" hex for secure holder engagement
• Primary functions: drilling, deburring, chamfering, countersinking
• Chip evacuation: optimized flute design for efficient removal

How to use

Secure the countersink bit in a compatible holder or drill chuck that accepts a 1/4" hex shank. Mark and center the workpiece where the hole and countersink are required. Start drilling at low to moderate speed to establish the entry hole, then apply steady pressure while widening the opening to form the 90° countersink profile. Withdraw periodically to clear chips and check the fit of the fastener head. For best results, use cutting speeds and feeds appropriate to the workpiece material and avoid excessive axial force that could cause tilting.

Usage recommendations

Use cutting fluid when working with metals to reduce heat and extend tool life. For softer materials, test on a scrap piece to determine optimal speed and feed. Inspect the bit regularly for wear or chipping and replace when the cutting edges become rounded to maintain clean countersinks and safe operation.