The Wiseman Threading Tools Bottom Lead Metric HSS Tap Left Hand - M16x1.5 is a precision ground hand tap designed for dependable, long‑lasting performance in metalworking projects. Built from high-speed steel and delivered uncoated for versatile cutting across a range of ferrous and non‑ferrous materials, this tap delivers clean, accurate threads with every pass.

Why this left‑hand HSS tap stands out

• Left‑hand thread, M16x1.5: perfect for applications that require reverse threading or where components use a left‑hand fastener. It’s a purpose‑built solution for maintenance, repair, or production that demands a reverse thread.
• Bottom lead design: engineered to advance more of the thread with fewer starts, providing deeper engagement in blind or through holes. This reduces tapping time and helps achieve consistent thread depth from the first cut.
• ISO 529 dimensions: conforming to standard metric thread geometry ensures compatibility with mating parts and fasteners you already use in your shop or workshop.
• High speed steel ground, uncoated: a robust cutting edge that handles a variety of metals with reliable wear resistance. The uncoated finish keeps cutting action predictable and straightforward when using standard cutting fluids.
• General purpose, ready for everyday use: a versatile choice for maintenance, repairs, and light production runs where consistent thread quality matters as much as tool life.
• Practical, maker‑friendly workflow: pair with a standard tap wrench, apply a suitable cutting fluid, and back off regularly to clear chips. The result is smoother tapping, fewer breakages, and more reliable threads in durable components.

Ideal use cases

• Repairing or creating left‑hand threaded fasteners in machinery housings, drive components, or fixtures.
• Retrofitting or fabricating assemblies where reverse threading is required for safe disassembly or specific mechanical functions.
• General metalworking projects in steel, cast iron, aluminum, and non‑ferrous alloys where a precise M16x1.5 left‑hand thread is needed.

Specifications at a glance

• Thread form: Metric, left‑hand
• Size: M16
• Pitch: 1.5 mm
• Lead type: Bottom Lead Tap
• Material: High Speed Steel (HSS)
• Finish: Uncoated
• Standard: ISO 529

With its durable construction and thoughtful bottom‑lead geometry, this Wiseman HSS tap is a reliable partner for technicians who need precise left‑hand threads without fuss. Whether you’re performing routine maintenance, repairing an old assembly, or undertaking a small‑batch fabrication, this tap delivers consistent thread quality, predictable performance, and lasting value.