Precision meets reliability in the Wiseman Threading Tools Bottom Lead Metric HSS Tap Right Hand - M39x4. This high-speed steel tap is ground and uncoated for everyday, general‑purpose internal threading that you can trust in busy workshops and professional fabrication shops.

• Thread geometry and finish: Metric, right-hand thread with a bottoming (bottom lead) profile for threading to the full depth of a hole. The uncoated HSS ground tool delivers clean, accurate threads with consistent pitch along the entire length.
• Standards and size: ISO 529 compliant dimensions tuned for M39x4 applications, ensuring a snug fit with standard female threads and dependable engagement with nuts and collars.
• Construction for demanding work: Robust high‑speed steel that maintains sharp cutting edges under repeated use, delivering reliable performance in steel, cast iron, and compatible nonferrous metals.
• Versatile use cases: Ideal for fabrication, repair, and maintenance tasks where strong internal threads are required—whether assembling machinery housings, brackets, or structural components.

How to use the tap for best results: start with a correctly sized pilot hole per ISO 529 guidelines for M39x4, apply a quality cutting oil or lubricant, and maintain a steady, square alignment as you turn the tap. Advance gradually, back off to clear chips, and resume cutting to build clean threads without overheating. The bottoming design ensures thread engagement reaches the hole’s bottom, making it especially effective for blind holes and precision assemblies.

Why choose this Wiseman tap: you’re getting a purpose-built tool with precise flute geometry and a reliable cutting edge that delivers repeatable thread profiles. Its general-purpose, right-hand, metric design makes it a staple for daily metalworking tasks, supporting durable joints and smooth fastener engagement across a range of materials.

Practical inside‑the‑shop value: pair this tap with compatible tapping accessories, use appropriate lubrication, and store it in a protected case to prolong edge life and maintain accuracy. The image shows the tool from multiple angles to illustrate its solid shank, square drive, and robust threading section—all engineered to stay true under demanding use.