For serious metalworkers who demand dependable internal threading, the Wiseman Threading Tools Second Lead Metric HSS Tap Right Hand - M40x3 is built to perform. This high-speed steel ground tap is uncoated, purpose-built for general use, and engineered to deliver clean, precise threads in a wide range of materials. ISO 529-compliant dimensions guarantee compatibility with standard metric taps, and the right-hand thread ensures clockwise threading. The second lead design accelerates engagement, enabling faster progress in through holes while maintaining thread quality.

Key specifications

• Material: High-speed steel (HSS), ground for a sharp, durable thread profile
• Coating: Uncoated for versatile use with common cutting fluids
• Thread direction: Right-hand (clockwise)
• Lead: Second lead (plug-tap style) for quicker engagement
• Thread size: M40 x 3 (metric, 40 mm major diameter, 3.0 mm pitch)
• Standard: ISO 529 dimensions for compatibility with other metric taps

Designed to cut internal threads in metals with reliability and ease, this tap is a solid fit for automotive, machinery maintenance, and fabrication environments where large-diameter, fine-pitch threaded holes are common.

What makes it unique

The combination of a true M40x3 size, right-hand orientation, and a second-lead geometry sets this Wiseman tap apart from standard, single-lead tools. The second-lead design reduces entry effort and improves chip evacuation in through holes, helping you achieve consistent thread quality at higher cutting speeds when paired with proper lubrication. ISO 529 compliance guarantees that the tap will seat correctly with standardized hole sizes and thread forms, minimizing rework and thread defects.

Ideal use cases

Use this Wiseman HSS tap when you need robust, metric internal threads in structural steel, aluminum alloys, or similar metals. It’s well-suited for through holes and applications where a larger diameter thread is required with a reliable finish. Pair it with a compatible tap wrench or a machine tapping setup, and run with appropriate cutting fluid to manage heat and chip formation. The ISO 529 family of taps is designed to work together in standardized threading projects, making this M40x3 tap a dependable part of any professional toolkit.

Practical tips for best results

• Use a sharp, clean tapping procedure with an appropriate pilot hole size according to ISO 529 guidelines for M40x3 threads.
• Lubricate generously with cutting fluid to reduce friction and heat buildup, extending tap life and improving thread finish.
• Start with the taper portion and allow the second-lead geometry to guide the thread into place smoothly; back off slightly to break chips if needed.
• Maintain steady, even rotation with a tap wrench or compatible machine spindle to preserve accurate thread geometry.
• Inspect the finished hole for concentricity and thread depth to ensure proper engagement with mating fasteners.

For reference on tap types and the role of lead in threading, see standard guidance on second-lead taps and ISO 529 dimensional practices.