The Wiseman Threading Tools Second Lead Metric HSS Tap Left Hand - M2x0.4 is a purpose-built precision tap crafted for small-diameter threading tasks where reverse-thread applications matter. Made from high-speed steel and ground for a clean, consistent cut, this uncoated tap delivers dependable performance across a range of light-to-moderate materials.

Key features that set this left-hand tap apart:

• Left-hand thread M2x0.4 — designed for assemblies that require tightening in the opposite direction, helping prevent loosening in vibration-prone or reverse-rotation environments.
• Second lead geometry — also known as the plug lead, this two-start design speeds up threading and improves chip evacuation for through-holes without sacrificing quality.
• ISO 529 dimensions — built to standard tap dimensions, ensuring predictable fit and compatibility with other taps and tooling in your shop.
• Ground, uncoated HSS — a robust, general-purpose tool that maintains a sharp cutting edge for clean threads in aluminum, brass, steel and many plastics.
• Through-hole ready and practical — optimized for quick, reliable threading in small components, electronics enclosures, and micro-mechanical assemblies where space is tight and precision matters.
• USA plug lead reference — aligned with common North American tapping setups to support straightforward, repeatable starts and alignment.

How to get the best results

• Follow ISO 529 guidance for appropriate thread length relative to the tap diameter; avoid threading longer than about 1.5 times the tap diameter to minimize breakage and ensure a clean cut.
• Drill a properly sized pilot hole, secure the workpiece, and use steady, even pressure with a compatible tapping tool or wrench.
• Use light cutting fluid or lubrication as needed to reduce friction and extend tap life, especially on harder materials.
• For reverse-threaded assemblies, start and tighten with the standard turning direction to ensure correct engagement and reliable fastening.

This Wiseman tap is a reliable addition to any precision threading kit, offering a specialized left-hand, second-lead solution that combines reliable performance with practical, everyday usability for small-format projects.