Tapping Drill Bit GEKO HSS M8 x 1.25 mm HEX (threading drill)

Tapping drill bit GEKO HSS M8 x 1.25 mm HEX is designed to prepare pilot holes and cut internal M8 x 1.25 threads. Manufactured from high-speed steel (HSS), the tool combines wear resistance and rigidity for reliable performance in metals and other machinable materials. The hex shank provides secure drive engagement and compatibility with hex chucks and quick-change adapters, making it suitable for both hand-held drills and drilling machines.

Advantages

The GEKO HSS tapping drill bit features a hardened high-speed steel construction that resists heat and wear during repeated threading operations. Its precisely ground geometry promotes consistent chip formation and reduces tap breakage risk when used to create M8 x 1.25 internal threads. The hexagonal shank ensures secure grip in hex chucks and minimizes slippage under load, while the compact nominal size supports work in confined spaces.

Suitable for

• Creating M8 x 1.25 internal threads in steel, stainless steel, aluminum and other machinable metals
• Use with hand-held electric drills and corded or cordless impact drivers with appropriate adapters
• Small workshop and industrial maintenance threading tasks

Key specifications

• Thread size: M8 x 1.25 (metric fine pitch)
• Material: High-speed steel (HSS)
• Shank type: Hexagonal shank for secure drive
• Intended use: Cutting internal threads (tapping drill)
• Compatibility: Suitable for use in hand-held drills and drilling machines with hex chuck or adapter

How to use

Select an appropriate pilot hole size and secure the workpiece. Mount the tapping drill bit in a hex-compatible chuck or adapter and set the drill to a moderate speed suitable for the workpiece material. Apply steady pressure while drilling the pilot hole, then progress to cutting the thread by advancing the tap carefully and reversing periodically to clear chips. Use cutting lubricant as required for the material being threaded. Maintain axial alignment to avoid cross-threading or tool breakage.

Usage recommendations

For best results, choose drill speed and lubricant based on material type (lower speeds for stainless steel, moderate speeds for carbon steel and aluminum). Always clamp the workpiece securely and back off periodically to clear chips. Inspect the bit for wear and replace when cutting performance declines to prevent damaged threads.