Wiseman Threading Tools: Second Lead Metric HSS Tap, Left Hand - M9x1.25

When you need precise internal threads in metric sizes with speed and reliability, this Wiseman second-lead, left-hand HSS tap is built for the job. Ground for a clean, accurate cut, and uncoated for robust performance in general-purpose tapping tasks, it adheres to ISO 529 dimensions to ensure consistent thread profiles in M9x1.25 holes.

Why this tap stands out

• Second lead design: A multi-start geometry that starts more aggressively and clears chips faster, reducing overall tapping time without sacrificing thread quality.
• Left-hand thread: Specifically engineered for reverse-threaded applications and assemblies where the helix direction must be opposite to standard right-hand taps.
• Metric precision: ISO 529 compliant with a precise M9x1.25 thread pitch, ensuring compatibility with standard metric fasteners and components.
• Uncoated HSS: Robust, versatile tapping performance suitable for a wide range of ferrous and non-ferrous metals in general-purpose shop work.
• USA plug lead geometry: Optimized lead configuration for dependable engagement in common tapping setups used in U.S.-based workshops.

Ideal use scenarios

• Creating or repairing internal threads in parts where a left-handed fastener is required, such as reverse-threaded housings or adapters.
• Metric projects in steel, cast iron, and aluminum where speed and clean thread formation matter in a single-pass operation.
• Prototyping and small-batch production runs in hobbyist shops or professional machine shops that value efficient cycle times and consistent results.

How to use

1. Drill the pilot hole to the ISO-referenced size for M9x1.25 threads, ensuring perpendicular alignment to the workpiece.
2. Lubricate with appropriate cutting oil or penetrating lubricant designed for HSS taps to minimize heat and extend tool life.
3. Begin tapping in a controlled, counterclockwise motion to form the left-hand thread, advancing to the desired depth with steady force.
4. Withdraw smoothly, allowing chips to clear, then verify the fit with a suitable metric connector or gauge.

Care and maintenance

After use, clean away chips and wipe the tap dry. Lightly oil to prevent corrosion and store in a protective sleeve to preserve thread geometry. Avoid overheating the tool and workpiece to maintain precise cutting edges for future jobs.

Specifications at a glance

• Tool type: HSS tap (ground, uncoated)
• Thread direction: Left-hand
• Lead: Second lead
• Size: M9 x 1.25
• Standard: ISO 529
• Lead geometry: USA Plug lead
• Scope: General-purpose internal thread tapping