Wiseman Threading Tools Bottom Lead Metric HSS Tap Left Hand - M10x1.25 is a precision-ground High-Speed Steel tap built for reliable internal threading. Uncoated and general purpose, this tap follows ISO 529 dimensions to deliver consistent, clean cuts across a range of common metals.

• Left-hand thread capability: engineered to cut reverse threads, making it ideal for assemblies that use left-handed fasteners or for situations where turning the opposite direction helps free a seized component.
• Bottom lead design: designed to engage deeply into the hole, allowing for full-thread depth in a single pass and smoother chip evacuation, which reduces tapping time and effort.
• High-speed steel, uncoated: a tough, wear-resistant material that stands up to repeated tapping in steel, cast iron, and softer alloys. The lack of coating ensures straightforward starting and predictable cutting action with appropriate lubrication.
• Metric M10x1.25: creates an internal thread with a 10 mm nominal diameter and a 1.25 mm pitch, compatible with standard M10 fasteners and fittings used in a wide array of mechanical and automotive applications.
• ISO 529 compliant: the thread form adheres to international standards, ensuring predictable engagement with nuts, inserts, and threaded components that follow the same spec.

Practical usage tips: align the tap precisely with the hole, use a suitable cutting fluid to control heat and extend tool life, and rotate counterclockwise when working with left-hand threads. Take light, steady cuts and back off periodically to break chips, ensuring clean, accurate threads every time. This Wiseman tap is a reliable workhorse for shops, hobbyists, and professional repair tasks that call for robust, left-hand internal threads in metric sizes.