Wiseman Threading Tools Second Lead Metric HSS Tap, Left Hand - M27x1.5 is a purpose-built interior-threading solution for metalworking where left-handed fasteners are required. Crafted from high-speed steel and ground for precision, this tap comes uncoated for reliable performance across a wide range of materials and cutting fluids, while ISO 529 dimensions guarantee consistent fit with metric components.

Key features that set this Wiseman tap apart

• Left-hand thread: Produces reverse-direction internal threads that tighten counterclockwise, essential for parts designed to resist vibration or loosening in opposite-rotation assemblies.
• Second lead design: Optimizes material removal and threading speed without compromising thread integrity, making it ideal for through-hole applications where efficiency matters.
• Metric size and standard: M27x1.5 with ISO 529 dimensions ensures compatibility with standard metric fasteners and components found in a wide range of machinery and equipment.
• High-speed steel, ground and uncoated: The hard, precision-ground flutes deliver clean, accurate threads and robust performance across metals commonly encountered in workshops and fabrication shops.
• Manual tapping compatibility: Designed for hand use with a standard tap wrench, giving you direct feel and control when starting and finishing threads in challenging workpieces.

Practical uses and ideal applications

This tap excels in situations where you need a dependable left-handed thread in metal parts, such as securing components that are designed to resist loosening under vibration. It’s well-suited for repair work, maintenance, and production tasks in machine shops, automotive repair, fabrication, and general engineering projects where precise M27x1.5 left-hand threads are required.

How to get the best results

• Match the tool to the hole: use a correctly sized drill to the manufacturer’s recommendations for M27x1.5 threads and ensure the hole is clean and perpendicular for best results.
• Lubrication matters: apply a suitable cutting fluid or light oil to reduce heat and extend tap life. Avoid dry tapping in hard materials.
• Start with control, finish with care: begin with steady, coaxial rotation using the left-hand direction, then advance gradually. If chips resist, back off slightly to clear them and resume.
• Depth and backing off: tap to the required thread depth, then back off a small amount to break chips and avoid binding at the end of the hole.

Care and maintenance for longevity

After use, clean away chips and wipe the tap clean. Store in a protective case to prevent nicks on the cutting edges. When sharpening or regrinding is necessary, follow manufacturer guidelines to preserve flute geometry and lead characteristics.