Introducing the Wiseman Threading Tools Spiral Flute Metric HSS Tap Right Hand - M39x4: a purpose-built tapping solution designed for precision, durability, and consistent results in metalworking projects. This high-speed steel ground tap is uncoated for efficient heat management and broad compatibility, optimized to fit ISO 529 dimensions for reliable thread formation in metric sizes. The spiral flute design activates chip evacuation early in the cut, helping you maintain smooth progress even in challenging holes.

Why the spiral flute matters

The spiral flute configuration isn’t just a detail—it’s a real advantage when threading blind or deep holes. By guiding chips out of the hole as you cut, this tap minimizes chip packing, reduces friction, and lowers the risk of tap binding or breakage. In practice, you’ll experience cleaner threads, less rework, and greater confidence when tapping complex components or assemblies.

Key benefits and what it means for your shop

• Precise, standard-compliant threading – engineered to ISO 529 metric tap blanks, ensuring the M39x4 thread profile matches your mating part accurately. This makes it a dependable choice for both repairwork and new fabrication.
• Durable HSS ground for reliability – a robust high-speed steel tap capable of repeated use in common metals, with an uncoated finish that favors excellent heat transfer and quick setup.
• Versatile, general-purpose performance – well suited for steel, cast iron, and many aluminum applications, making it a staple in machining, fabrication, and maintenance shops.
• Right-hand threading for straightforward operation – designed to produce standard right-handed threads in a single, controlled pass, simplifying setups and reducing cycle times.

How to use this tap like a pro

Begin with a properly sized pilot hole according to the manufacturer’s tap chart for M39x4. Use a reliable cutting fluid or tapping oil to minimize heat and extend tap life. Start the tap straight to engage the first threads, then maintain steady, even pressure as you advance. For blind holes, the spiral flute helps keep chips moving upward, allowing you to reach the full thread length without stopping to clear debris. Finish with a gentle reverse twist to break the chip and withdraw cleanly. Following these practices optimizes thread quality and tool longevity.

Who will benefit most

This Wiseman tap is ideal for machinists, hobbyists, and maintenance technicians who need dependable metric threads in metal parts, fixtures, or structural components. Whether you’re repairing a stripped M39x4 hole or producing a new part that must mate with a precisely threaded counterpart, this tap delivers consistent results alongside other Wiseman threading tools.

Care, tips, and longevity

To maximize life and performance, keep the tap clean and free of built-up chips after use. Apply fresh cutting lubricant before reusing, and avoid excessive forcing or misalignment, which can stress the flute geometry. When tapping into harder materials, consider progressively stepping up to the full depth with light, controlled passes to preserve thread integrity. Spiral flute taps are particularly forgiving in challenging holes, but they still reward careful technique.

Specifications at a glance

• Product: Wiseman Threading Tools Spiral Flute Metric HSS Tap
• Thread: Right-hand
• Size: M39x4
• Material: High-Speed Steel (HSS), ground finish
• Finish: Uncoated
• Standard: ISO 529 (thread blank dimensions for metric taps)
• Flute style: Spiral flute for efficient chip evacuation