Meet the Wiseman Threading Tools Second Lead Metric HSS Tap Left Hand - M18x2.5, a precision-made internal threading solution engineered for metric left-hand applications. This uncoated, ground high-speed steel tap is built for reliability in general-purpose tapping tasks, with ISO 529 dimensions to ensure consistent fit and thread quality across compatible workpieces.

Key features that set this tap apart

• Left-hand thread, M18x2.5 — designed for reverse-threading projects where the component must tighten in the opposite direction, making it ideal for gearboxes, adjustment screws, and left-handed fastener assemblies.
• Second lead — a multi-start design that engages material more quickly, reduces tapping time, and yields cleaner, more uniform threads, especially in softer metals.
• High-speed steel, ground finish — delivers durable cutting edges, precise thread profiles, and improved chip evacuation while maintaining a smooth, accurate thread path.
• Uncoated, general purpose — ready to perform in a wide range of standard workshop environments; simply apply the right cutting fluid to maximize tool life and finish.
• ISO 529 dimensions — guaranteed compatibility with standard metric holes and matching taps, helping you avoid mismatches during production or repairs.
• USA Plug lead — designed with practical lead geometry that supports straightforward alignment and starting into the hole, reducing the risk of cross-threading.

Ideal use cases

• Repairing or fabricating left-hand threaded components in automotive, machinery, or industrial fixtures where an opposite-rotation fastener is required.
• Creating secure, backlash-resistant threads in soft steels, cast iron, or aluminum parts where a dependable, repeatable tap is essential.
• Maintenance and assembly tasks in production lines that rely on precise metric threads without sacrificing speed.

How to get the best performance

• Prep with a clean, properly sized pilot hole appropriate for M18x2.5 left-hand threads per standard tapping guidelines.
• Use appropriate cutting fluid or a light oil to reduce heat and extend tap life.
• Follow a steady, even feed in the left-hand direction; avoid forcing the tap through the workpiece to prevent breakage.
• Clear chips regularly during tapping to maintain thread integrity and prevent binding.

What’s included: one Wiseman Threading Tools Second Lead Metric HSS Tap Left Hand - M18x2.5, crafted for dependable performance in metric internal threading tasks.

Width of scope, depth of capability, and a design rooted in practical machining needs—this tap is built for machinists, fabricators, and gear technicians who value precise left-handed threads and efficient production workflows. When your project demands reliable, repeatable metric threads in reverse direction, this Wiseman tap is ready to perform.