The Wiseman Threading Tools Second Lead Metric HSS Tap Left Hand - M22x1.5 is a precision-ground, uncoated tapping tool designed for reliable left-hand threads in steel and alloys. Built to ISO 529 standards, this tap delivers consistent pitch, clean engagement, and durable performance in demanding threading tasks.

Key features that matter in real-world tapping

• Material and finish: High-speed steel with a precisely ground thread profile for sharp cutting edges. Uncoated finish optimizes heat tolerance and makes re-sharpening or touch-ups straightforward with standard cutting oils.
• Left-hand thread: Specifically engineered to cut or repair reverse threads, essential for assemblies where tightening occurs counterclockwise or where components must be unscrewed easily.
• Second lead: A dual-start geometry that accelerates thread formation, reduces tapping torque, and improves chip flow for faster, smoother operation—especially in through-holes.
• Metric dimensions, M22x1.5, ISO 529: Precisely matched to international standards, ensuring compatibility with common drill sizes and predictable results across materials.
• USA plug lead: Designed with plug-tap lead geometry that aligns with typical US threading practices, promoting reliable engagement and consistent full-thread formation.

Who benefits most

Machinists, metalworkers, and hobbyists who regularly encounter left-hand fasteners or need to reverse-thread components will appreciate the predictability and control this tap provides. It’s well-suited for repairing damaged internal threads, creating new left-hand threads in steel and cast iron, and for use in maintenance work where undoing fasteners is part of the job.

Practical use and best-practice tips

Before tapping, drill with the correct hole size according to ISO 529 for M22x1.5. Apply a light amount of cutting oil or tapping fluid to reduce friction and heat buildup. Maintain steady, perpendicular alignment to ensure straight threads and minimize cross-threading. Advance gradually, then back off periodically to break chips and prevent binding. After tapping, clean the threads and inspect for consistent engagement along the full length of the cut.

Why choose Wiseman threading tools

Wiseman tools are built for reliability and long tool life. The combination of second-lead geometry, left-hand threading capability, and ISO-compliant M22x1.5 dimensions delivers a practical solution for reverse-thread requirements and demanding metalworking tasks. This tap is a trusted addition to any machining kit, offering predictable performance when every thread counts.