Introducing the Wiseman Threading Tools Second Lead Metric HSS Tap Right Hand - M39x3, a purpose-built threading tap engineered for reliability and speed in metric threads. Crafted from ground high-speed steel and uncoated for direct cutting performance, this tap adheres to ISO 529 dimensions to ensure consistent results across standard tooling setups.

Why this second lead HSS tap stands out

• Second lead design: multi-start threading that kicks off the cut more aggressively, reduces starting torque, and speeds up the tapping process without sacrificing thread integrity.
• Right-hand thread, M39x3: precise metric specification that aligns with common fasteners and assemblies, making it a dependable choice for larger-diameter projects.
• Ground HSS, uncoated: a robust cutting edge that delivers clean thread profiles, especially suitable for through-holes in metal while offering long tool life in general-purpose applications.
• ISO 529 compliant: ensures compatibility with standard drill/machine setups and predictable performance in production or workshop environments.
• USA plug lead geometry: optimized for typical American workshop workflows, supporting easy alignment and steady operation in busy shops.

Ideal applications and use cases

This tap excels for large-diameter metric threading tasks in steel, aluminum, and other machinable metals. Use it for fabricating robust housings, equipment frames, heavy-duty brackets, and other components that require reliable M39x3 threads. It’s equally at home in prototyping shops and professional machine shops where quick cycle times and durable tooling matter.

Practical guidance for best results

• Prepare the hole with an appropriate drill size for the M39x3 thread profile and apply a suitable cutting fluid to control heat and extend tool life.
• Start the tap square to the workpiece and apply steady, moderate feed pressure to achieve clean, true threads without deflection.
• Occasionally back the tap out to break and clear chips, especially in harder materials or deeper holes.
• After tapping, remove the tap with care, clean the threads, and store in a dry environment to prevent corrosion and maintain performance.

With its combination of a second lead geometry, durable HSS construction, and ISO-aligned dimensions, the Wiseman Second Lead Metric HSS Tap provides dependable, efficient threading for substantial metric projects. Designed for serious work and long-term value, it’s the go-to choice when you need fast, precise M39x3 threads without sacrificing quality.