Meet the Wiseman Threading Tools Bottom Lead Metric HSS Tap - M39x2, a purpose-built tool crafted for precise metric threading in metalwork. This high-speed steel (HSS) ground tap is uncoated for broad compatibility across materials and setups, delivering reliable performance from the first cut to the final thread finish. With ISO 529 dimensions and a right-hand thread, it’s designed to slot seamlessly into standard machining workflows, ensuring consistent, repeatable results in every hole you tap.

Core features that deliver consistent results

• HSS ground finish with sharp flutes for efficient chip evacuation, minimizing friction and reducing the risk of binding during deep cuts.
• Uncoated versatility suitable for a wide range of materials—steel, stainless, aluminum, and brass—when paired with appropriate cutting fluids.
• Bottom lead (bottoming) design that enables full-thread engagement to the hole bottom, ideal for blind holes or applications requiring complete thread depth.
• Right-hand thread with a precise M39x2 pitch, matching standard metric fasteners and nuts for dependable assembly compatibility.
• ISO 529 compliant ensuring consistent thread geometry and interchangeability with other metric tapping tools and fasteners.

Size and specification: This is a metric M39x2 bottoming tap, indicating a 39 mm major diameter with a 2 mm pitch. The bottoming design is purposefully engineered to produce full threads to the bottom of the hole, enabling robust, long engagement for secure fastening in demanding applications.

Practical usage tips

• Apply a suitable cutting fluid or tapping oil to reduce heat and extend tool life.
• Align the tap carefully with the hole axis; use a guide or jig for straight, true threading.
• Start with light, steady turns and back off intermittently to break chips and prevent binding.
• Finish with a full-depth pass to seat threads cleanly and avoid tearing the material.

Who is this for? Machinists, metal hobbyists, and workshop professionals who need durable, metric threads in large-diameter holes will benefit from this bottom lead tap. It’s a reliable choice for repair work, mechanical assemblies, and equipment that demands secure, high-precision fasteners. When you need threads that extend all the way to the hole bottom with consistent tolerance, this Wiseman HSS tap is built to deliver.