The Wiseman Threading Tools Second Lead Metric HSS Tap Left Hand - M30x1 is a precision internal thread tap purpose-built for metric threading in tough materials. Crafted from high-speed steel and ground for accuracy, this tap delivers clean, repeatable threads without the guesswork. Uncoated for versatility, it works seamlessly with your favorite cutting fluids and honing practices, making it a dependable choice for shop benches and on-site repairs alike. Built to ISO 529 dimensions, this tool ensures the thread profile, pitch, and flank geometry stay consistent across jobs.

Key features that matter

• Material and finish: High-speed steel, ground to exacting tolerances, uncoated for compatibility with a wide range of lubricants and working conditions.
• Thread specifics: Left-hand thread in metric size M30x1, designed to cut in reverse where needed and to resist loosening in certain assemblies.
• Second lead: A second lead design speeds up depth progression, reducing total turning effort while preserving thread accuracy and surface finish.
• Standards and geometry: ISO 529 compliant dimensions ensure reliable fit with corresponding taps, dies, and threaded holes, reducing rework and scrap.
• Practical compatibility: Optimized for use with standard tap wrenches and setups common in maintenance shops, machine shops, and fabrication floors.
• Ideal applications: Suitable for automotive housings, machinery components, bicycle frames, and other projects requiring robust internal threads in a 30 mm bore.

Designed for professionals who demand dependable performance from a metric left-hand tap, this Wiseman tool balances speed with precision. The left-hand orientation is particularly valuable in reverse-thread assemblies or when correcting misthreads without disassembly. The combination of Second Lead and ground HSS material translates into smoother cutting action, less thread deformation, and better chip evacuation—especially in materials like mild steel, aluminum, and brass.

Practical tips for best results:

• Match the tap size to a properly prepared hole drilled to ISO 529 guidelines for M30x1 threads.
• Use a steady cutting fluid or lubricant to minimize heat and maximize tool life.
• Start the thread with a light touch and maintain consistent feed to avoid cross-threading or chatter.
• Clear chips frequently to prevent binding and preserve thread quality.

Whether you’re performing routine repairs, fabricating metric-component housings, or refreshing critical assemblies, the Wiseman LH M30x1 tap gives you reliable, accurate threads with less effort and fewer retries.