Wiseman Threading Tools Second Lead Metric HSS Tap Left Hand - M35x1.5 is a precision ground tap engineered for clean, reliable internal threads in left-hand applications. Crafted from high-speed steel and finished uncoated, this tap adheres to ISO 529 dimensions to deliver consistent thread form across a range of common metals. The left-hand orientation makes it ideal for reverse-threaded assemblies, while the second lead design speeds cutting without compromising thread quality.

Why this left-hand thread tap matters

Left-hand threads are essential when a component must resist loosening in the opposite rotation direction or when a backward-threaded fastener is required by design. This Wiseman tap produces accurate M35x1.5 threads with a smooth, controlled cut, helping you achieve secure fits in housings, fixtures, and reverse-thread assemblies.

Second lead and USA plug lead design

The second lead accelerates the initial engagement, improving break-in and reducing tapping time. The USA plug lead configuration supports easier starting alignment, minimizing the risk of cross-threading and ensuring a reliable entry into the hole from the very first rotation.

Key specifications at a glance

• Material: High Speed Steel (HSS), ground finish, uncoated
• Thread: Left-hand, metric M35x1.5
• Lead: Second lead (USA plug lead)
• Standard: ISO 529 dimensions

Ideal applications

Use this tap for general-purpose internal threads on steel, cast iron, aluminum, and other common metals where a left-hand thread is required. It's a practical choice for repairs, prototyping, restoration, and small-batch manufacturing where dependable thread quality and predictable performance matter.

Practical tapping guidance

• Drill a pilot hole sized per ISO 529 guidelines for the material you’re threading.
• Lubricate with a suitable cutting oil to reduce heat and extend tap life.
• Begin with light pressure and a steady, even rotation to form a clean thread.
• Back out occasionally to clear chips and prevent binding, then continue to final depth.

Who benefits from this Wiseman tap

Machinists, fabricators, hobbyists, and workshop technicians who work with left-handed fasteners or reverse-thread assemblies will value the reliability and consistency of this HSS tap. It’s an economical, ISO-standard solution for precise left-hand threading in a wide range of projects.