The Wiseman Threading Tools Second Lead Metric HSS Tap Left Hand - M11x1.5 is a precision internal-threading solution built for reliability and speed in metalworking. This uncoated, high-speed steel tap is ground to ISO 529 dimensions, delivering consistent threads and smooth chip evacuation across a range of materials.

In the included image you can see the tap’s sturdy square drive, precise flute geometry, and robust overall build that moves metal efficiently without sacrificing accuracy.

Key features and benefits

• Second-lead design (double lead) minimizes the number of turns required for deeper holes, accelerating production cycles and improving throughput in production environments.
• Left-hand thread ideal for applications that require reverse-threading to resist loosening under vibration or to accommodate components designed for reverse assembly.
• M11 x 1.5 metric size aligned with ISO 529 geometry, ensuring compatibility with standard tapping drills and predictable results.
• Uncoated HSS (high-speed steel) provides dependable hardness and edge retention for general-purpose tapping across a variety of workpiece materials when paired with proper lubrication.
• Ground finish delivers clean threads and better surface finish in the tapped hole, reducing finishing work downstream.

Ideal uses and scenarios

This left-hand, second-lead tap is well-suited for workshop and shop-floor environments where quick, reliable left-handed threads are required. Typical applications include tapping holes in steel, stainless steel, and aluminum where a reverse-threaded fastener or a reverse-threaded component must be secured or disassembled easily. It’s a solid choice for automotive, manufacturing, and repair tasks that demand consistent thread quality and efficient cycle times.

Practical usage tips

1. Prepare the hole with a drill size appropriate for M11x1.5 taps according to ISO 529 guidelines.
2. Apply a suitable cutting fluid or oil to reduce heat buildup and extend tap life.
3. Align the tap square to the workpiece and begin cutting by turning in the direction appropriate for left-hand threads (typically counterclockwise to advance).
4. Maintain steady, even pressure and a consistent pace; back off to clear chips as needed to avoid clogging.
5. Verify the finished thread with the appropriate gauge or plug to ensure the fit meets your application’s tolerances.

With its ISO 529-compliant dimensions, robust HSS construction, and the efficiency gains of a second-lead design, this Wiseman tap offers dependable performance for professionals and serious hobbyists who value precision and productivity in metal threading tasks.