Wiseman Threading Tools Second Lead Metric HSS Tap Left Hand - M16x1.5 is a precision ground tapping tool engineered for fast, dependable left-hand thread creation in metal. Crafted from high-speed steel and finished uncoated, this tap adheres to ISO 529 dimensions to deliver consistent results across workpieces and machines.

Why this tap stands out

• Left-hand thread, M16x1.5: Specifically designed for reverse-thread applications where a left-handed fastener is required, ensuring precise engagement and reliable fastening in assemblies.
• Second lead (multi-start): The second-start geometry increases cutting action, enabling faster tapping and smoother thread formation without sacrificing accuracy.
• High-speed steel, ground finish: A robust substrate with a tightly ground profile for clean, sharp threads and extended tool life in standard metalworking tasks.
• Uncoated for versatility: The natural, uncoated surface performs well with common tapping fluids and works effectively on a range of metals, from mild steels to aluminum, without introducing coating-related debris.
• ISO 529 compliance: Consistent geometry and thread form aligned to international standards, ensuring compatibility with adapters, jigs, and existing tooling setups.

What you can do with it

Ideal for professional machine shops, fabrication environments, and serious hobbyists tackling left-hand threaded components. Use this M16x1.5 tap to form accurate internal threads in through-holes or blind holes where a left-hand fastener must be secured. The second lead accelerates the tapping process on larger diameter holes, making it practical for production runs as well as precision projects.

Practical guidance for best results

• Match the drill size to the M16x1.5 thread with a proper pilot hole to ensure clean tapping and minimize torque.
• Lubricate with a suitable tapping fluid to reduce friction, dissipate heat, and extend tool life.
• Use a tap wrench or a parallel-square tapping holder to maintain true alignment and prevent chip wedging.
• For left-hand threads, rotate counterclockwise when cutting and gradually back out to clear chips, following safe tapping practices.
• Clean and inspect the finished threads; a accurate plug gauge or go/no-go thread plug can help verify tolerances.

Who benefits most

Engineers, machinists, and fabricators who frequently work with reverse-thread assemblies or devices that require left-handed fasteners will appreciate the reliability and speed gains from the Wiseman Second Lead HSS Tap. It’s equally at home in production environments and custom projects where precise, repeatable left-hand threading is a must.

Performance compared to typical taps

Compared with standard single-lead taps, the second-lead geometry reduces cutting resistance and promotes quicker material removal, resulting in shorter cycle times without compromising thread integrity. The uncoated HSS composition provides solid performance across common metals, with easy maintenance and straightforward lubrication workflows.

Specifications at a glance

• Tool type: Tapping tool (thread tap)
• Material: High Speed Steel (HSS), ground finish
• Coating: Uncoated
• Thread direction: Left-hand
• Lead: Second lead (multi-start)
• Thread size: M16x1.5
• Standard: ISO 529 dimensions
• Intended use: Internal thread creation in metal workpieces

When you’re assembling components that rely on left-handed fasteners, this Wiseman HSS tap delivers dependable performance, repeatable results, and a practical approach to faster threading. Add it to your tool chest and tackle left-hand threading tasks with confidence.