Wiseman Threading Tools Metric Fine HSS Hand Tap Set ISO529 - M39x3 is a precision solution for creating clean, strong internal threads in metal parts. Built for professional workshops and skilled hobbyists alike, this set uses high-speed steel (HSS) ground taps that are uncoated for reliable, general‑purpose tapping performance. With ISO 529 alignment, you can count on consistent threading of standard metric M39x3 holes, driven by a right‑hand thread orientation that fits most common applications.

What you get is a complete tapping progression designed to deliver accurate, repeatable results in a single hole sequence. The set includes three essential leads:

• Taper lead — a gentle chamfer to start the thread cleanly and reduce thread walk.
• Intermediate (second) lead — extends the thread smoothly toward full depth, maintaining alignment and chip evacuation.
• Bottoming lead — finishes the thread to full depth for a complete, usable internal thread.

These taps follow ISO 529 standards for short machine taps and hand taps, ensuring compatibility with standard metric fine threads and predictable drill-to-tap relationships. The taper, intermediate, and bottoming configuration is a proven approach for producing reliable threads in a variety of metals and thicknesses.

Key features that matter in real-world machining

• Metric fine threading, M39x3: This size corresponds to a precise 39 mm major diameter with a 3 mm thread pitch, a common specification for robust, high‑strength fasteners in machinery and structural components. The metric designation and pitch are aligned with ISO 529 for broad interoperability with other tooling and workpieces.
• High‑speed steel, ground, uncoated: The HSS construction provides heat resistance and edge retention during cutting, while a ground flute finish minimizes burrs and improves chip control. The uncoated surface reduces friction in many steel and alloy workpieces, helping extend tool life when used with proper lubrication.
• Right‑hand threads: The standard threading direction for most internal applications, simplifying alignment with existing fasteners and components.
• ISO 529 compliant: Adheres to the recognized standard for short machine taps and hand taps, ensuring predictable performance and compatibility with other ISO 529 tooling in your shop.

Ideal uses and materials

• Steel, cast iron, and nonferrous metals are well-suited to HSS taps, delivering clean cuts and precise thread profiles.
• Maintenance, industrial fabrication, automotive repair, and general mechanical assemblies benefit from having a Wiseman M39x3 set on hand for quick, reliable thread repair and creation.
• When you need a dependable tapping solution that follows established standards, this metric fine tap set offers a straightforward path from pilot hole to finished thread.

Practical tapping tips for best results

• Use a correctly sized tapping drill as recommended for M39x3 to achieve the proper minor diameter and a clean thread. ISO 529 tooling guidance and tap charts can help identify the appropriate drill size for your material.
• Lubricate diligently, especially with steel or tougher alloys, to reduce tool wear and improve thread finish.
• Tap with steady, even pressure and a patient, clockwise rotation; back off periodically to clear chips and maintain alignment.
• Work from a pilot hole with a reliable drill press or hand tapping setup, keeping the tap square to the workpiece to avoid cross‑threading.

With the Wiseman Metric Fine HSS Hand Tap Set ISO529 - M39x3, you’re choosing a focused, standards-aligned solution designed for precise threading work. Its robust HSS construction, clear taper‑to‑bottom progression, and adherence to ISO 529 ensure you can tackle demanding internal threads with confidence and repeatability.

For reference and context, ISO 529 defines the standard for short machine taps and hand taps, including the taper, intermediate, and bottoming configurations used in this set. M39x3 is a recognized metric fine thread size frequently specified for robust threaded joints in metal assemblies.