The Wiseman Threading Tools Second Lead Metric HSS Tap in M39x2 is engineered for precise, efficient metric threading in a range of metals. Crafted from high-speed steel and precision-ground, this tap delivers reliable performance in general-purpose applications where clean, accurate threads are essential. The uncoated finish provides predictable cutting behavior and straightforward chip flow, while ISO 529 dimensions ensure compatibility with standard female threads.

Key features that matter in real work:

• Size and thread: M39x2 metric, with a right-hand thread designed for conventional turning and machining operations.
• Lead design: Second lead (two-start) taps cut faster than traditional single-start taps, reducing cycle time on larger-diameter threads while maintaining thread quality.
• Material and finish: High-speed steel, ground to precision tolerances, and uncoated for consistent performance across a variety of metals.
• Standards: ISO 529 dimensions, ensuring that the threads you cut match standard M39x2 female threads used in common machinery, housings, and components.
• Application: Ideal for through-holes and demanding general-purpose threading tasks in steel, cast iron, and certain non-ferrous materials where durability and accuracy are priorities.

Why this tap stands out in practical use:

• For production runs and field repairs alike, the second-lead design accelerates tapping of large-diameter holes without sacrificing thread integrity.
• The uncoated HSS construction is robust under high heat and offers a predictable cutting action, which translates to fewer aborted passes and more consistent threads.
• ISO 529 compliance means you can trust the tap drill and finished thread to align with standard nuts, bolts, and inserts that engineers and machinists rely on daily.

Best practices for optimal results:

• Lubricate with a suitable cutting oil or soap-based lubricant to minimize friction and chip buildup.
• Feed the tap steadily and maintain perpendicular alignment to the workpiece to avoid cross-threading.
• Back off slightly after every few turns to break and clear chips, then resume cutting for smoother finishing passes.
• Use a properly sized tap wrench or machine tapping setup to maintain straightness and prevent tool deflection.
• Always verify the hole size against the ISO 529 chart for M39x2 to ensure the best fit and thread engagement.

Designed for professionals and serious hobbyists who demand reliability and speed in metric threading, the Wiseman M39x2 two-start tap is a dependable choice for fabricating robust, accurate threads in a busy workshop. Whether upgrading your tap assortment or tackling a new build, this tool brings proven capability to your metalworking toolkit.