Wiseman Threading Tools — Taper Lead Metric HSS Tap, Right Hand - M40x3

When you need clean, reliable internal threads in metal, this Wiseman tapping tool is built for precision and lasting performance. The high-speed steel (HSS) core is ground for a sharp, consistent cut, while the taper lead design spreads cutting forces across a wider entry area. That means easier alignment, smoother starting turns, and reduced risk of cross-threading or chatter as you begin the cut. The right-hand thread (clockwise) is the standard choice for most assemblies, and the uncoated surface keeps the tool simple and versatile for general purpose use. (taper lead design)

• Thread specification: Metric M40x3 with ISO 529-compliant geometry to ensure compatibility with standard metric holes and threads. ISO 529 standard
• Lead design: Taper lead provides gradual engagement for a controlled start and accurate thread formation. Taper lead
• Material & finish: Uncoated, ground high-speed steel (HSS) for durability and broad compatibility with common lubricants and workpiece materials.
• Thread direction: Right-hand (clockwise) threading suitable for most standard fastening applications.
• Standardization: Designed to align with ISO 529 thread-form specifications, delivering consistent thread profiles across compatible taps. ISO 529
• Starting hole guidance: For M40x3 tapping, tap-drill charts typically indicate a pre-drill size around 37.0 mm to achieve proper thread depth and engagement. 37.0 mm tap drill

Practical use tips

• Lubrication is essential to maximize tool life and thread quality. Use an appropriate cutting fluid or oil to reduce friction and heat buildup during tapping. Lubrication improves cutting efficiency
• Respect the recommended engagement length. ISO 529 taps perform best within standard limits; avoid creating threads longer than about 1.5 times the tap diameter to minimize breakage risk. Limit thread length to ~1.5d
• Keep the workpiece steady and align the tap carefully to prevent cross-threading. Periodically back off to break the chip and clear the thread path.

This Wiseman HSS taper-lead tap is a versatile, general-purpose choice for professionals and serious DIYers who regularly cut internal threads in metal. Ideal for fabricating or repairing components in automotive, machinery housings, brackets, and structural parts, it delivers dependable performance with consistent results—time after time.