The Wiseman Threading Tools Second Lead Metric HSS Tap Left Hand - M25x1.5 is a precision-engineered tapping solution built for durable, accurate left-hand threads in metal. Ground for clean cutting and uncoated for versatile performance, this high-speed steel tap is ready for general purpose use in a range of ferrous and non-ferrous materials why it’s trusted in both shop and field settings.

• Material and finish: High-speed steel (HSS) with a precise ground thread profile. Uncoated construction provides reliable heat resistance and predictable tool life across common metals.
• Thread specification: Metric M25 x 1.5 left-hand thread, designed to cut reverse threads with ISO 529 dimensions for compatibility with standard tapping practices.
• Lead configuration: Second lead (multi-start) design reduces the number of turns needed to advance the thread, improving cutting efficiency and chip evacuation for faster, smoother tapping.
• Left-hand capability: Specifically built for left-hand (reverse) threads, tightening when rotated counterclockwise. Ideal for reverse-threaded fasteners or applications where disassembly requires a reverse-thread approach.
• Applications and use cases: Perfect for creating M25x1.5 LH threads in steel, cast iron, or certain aluminum components, including automotive fittings, machinery housings, and repair work that requires reverse threading.
• Practical tips: Match the drill size to ISO 529 guidance for the diameter, use cutting fluid to reduce heat and wear, and avoid tapping lengths longer than about 1.5 times the tap diameter to minimize breakage risk. Pair with a tap wrench or appropriate machine tap guide for steady, precise threading.
• Why this Wiseman tap stands out: A durable HSS tap with a carefully engineered second-lead for efficient cutting, backed by Wiseman’s reputation for consistent geometry and reliable performance in challenging metalworking tasks.

When you need trustworthy LH threading with dependable cutting action and clear, repeatable results, the Wiseman Threading Tools Second Lead Metric HSS Tap Left Hand - M25x1.5 delivers precise threads, quicker setup, and practical efficiency for professional machining, repairs, and fabrication projects.