The Wiseman Threading Tools Second Lead Metric HSS Tap Left Hand - M17x1 is a precision threading solution designed for metric components that require a left-hand thread. Made from high-speed steel and ground to tight tolerances, this uncoated tap delivers clean, consistent grooves with every pass, making it a reliable choice for professional shops and repair jobs alike.

Why this tap stands out

• Left-hand thread capability for applications where rotation direction matters and reverse-threaded fasteners are used to resist loosening under load.
• Second lead design (two-start) to accelerate the cutting process, reducing hand fatigue and the number of turns needed for a complete thread.
• ISO 529 dimensions ensures compatibility with standard metric holes and components, simplifying pairing with compatible taps and nuts.
• General purpose, uncoated HSS provides reliable performance across a range of common metals, with straightforward chip flow and good heat tolerance for everyday tapping tasks.
• USA Plug lead specification supports typical tapping setups for American tooling environments.

Technical snapshot

• Material: High Speed Steel (HSS), ground for precise thread form
• Finish: Uncoated
• Thread type: Left-hand
• Lead: Second lead (two-start)
• Size and pitch: M17x1 (metric)
• Standard: ISO 529

Practical uses and scenarios

• Machining and assembly tasks in machinery, automotive, and equipment maintenance where left-handed threads are required.
• Repair work on components that rotate in a direction where a left-hand thread is advantageous for retention.
• General purpose tapping in steel, aluminum, and other common alloys encountered in fabrication shops.

Tips for best results

1. Drill the correctly sized pilot hole according to ISO 529 guidelines for M17x1 before tapping.
2. Use a suitable cutting fluid or lubricant to improve chip evacuation and tool life.
3. Align the tap straight to the hole and, for left-hand threads, rotate counterclockwise to cut and form the thread; back off slightly to break chips and reduce binding.
4. Tap gradually and periodically withdraw to clear chips, especially on deeper holes.

Designed for reliability, the Wiseman Second Lead M17x1 Left Hand HSS Tap is a practical choice for professionals needing a dedicated tool that delivers consistent performance while handling the demands of everyday threading tasks.