Tap Wera Kombigewindebohrer M4 — combination spiral flute tap for metric M4 threads

Wera Kombigewindebohrer M4 — combination spiral flute tap for metric M4 threads is designed to produce precise internal M4 threads in a variety of materials. This combination spiral-flute tap integrates features that support efficient chip evacuation and reduced tapping breakage risk, making it suitable for both through-holes and blind holes when used with appropriate drill preparation. The tool is intended for use in workshops, maintenance operations and precision assembly where repeatable, clean threads are required.

Advantages

The combination spiral flute design promotes reliable chip evacuation, which reduces clogging and improves surface finish of the formed thread. Its geometry balances cutting and guiding functions to lower the likelihood of tap breakage while maintaining dimensional accuracy. Manufactured by Wera, the tap is engineered for consistent performance in typical metalworking and mechanical repair tasks.

Suitable for

• Tapping internal metric M4 threads in steel and non-ferrous metals
• Through-hole and blind-hole applications with correct drill depth and tapping technique
• Workshop repairs, maintenance and small-scale production tasks
• Precision assembly where consistent thread quality is required

Key specifications

• Thread size: metric M4
• Tap type: combination spiral-flute (spiral point and spiral flute hybrid geometry)
• Application: internal threading for through and blind holes depending on setup
• Material compatibility: suitable for general steels and non-ferrous metals; selection should align with recommended cutting parameters
• Shank style: standard straight shank suitable for common tap holders and hand tap wrenches

How to use

Select an appropriate drill size and prepare the hole to the correct depth for M4 threading. Secure the workpiece and align the tap square to the hole axis. Use cutting fluid suitable for the workpiece material to improve lubrication and chip flow. Start threading with steady, even pressure, reversing slightly at intervals to break chips if necessary. For blind holes, monitor depth carefully and withdraw periodically to clear chips. Apply consistent torque and avoid excessive force to reduce risk of tap breakage.

Usage recommendations

Use the tap with compatible holders or hand wrenches and match cutting speed and feed to the workpiece material. For harder alloys, reduce cutting speed and use appropriate lubricants. Inspect the tap for wear before use and replace it if cutting edges degrade to maintain thread quality. When tapping blind holes, ensure sufficient chip clearance and withdraw the tap regularly to prevent chip accumulation.