Meet the Wiseman Threading Tools Second Lead Metric HSS Tap Right Hand - M25x1.5, a precision-ground tool built for dependable internal threading in metalworking projects. Crafted from high-speed steel and uncoated for broad compatibility, this tap delivers accurate pitches and robust cutting performance across a range of materials.

Designed to ISO 529 specifications with a right-hand thread and a second lead (two-start) configuration, it helps you complete threads faster while maintaining clean, accurate engagements. The result is smoother cutting, reduced hand fatigue, and fewer reworks when tapping holes in steel, aluminum, and other common metals.

Key features that matter in real-world tapping

• Precision-ground thread provides consistent pitch engagement and clean chip evacuation for precise M25x1.5 threads.
• Second lead (two-start) design cuts threads more quickly than a single-start tap, helping you finish jobs faster without compromising accuracy.
• Uncoated HSS offers broad compatibility with a variety of metals and accepts standard cutting fluids for optimized lubrication and cooling.
• ISO 529 compliant dimensions ensure reliable mating with standard M25x1.5 nuts and fittings, reducing guesswork on dimensions.
• Right-hand thread aligns with most common drilling and tapping applications, making it a versatile choice for general fabrication and repairs.

Practical uses and how this tap shines

• Repair or create internal threads in steel components, engine blocks, transmission housings, aluminum brackets, and similar metal parts.
• Ideal for workshop projects, maintenance work, or small-scale production runs where fast, repeatable tapping is valuable.
• Works well with hand tapping setups and compatible tapping machines, provided you use proper lubrication and steady, controlled motion.

How to get the best results

• Prepare the hole with a pilot drill per ISO 529 recommendations for M25x1.5 threads.
• Lubricate the tap and workpiece to reduce friction and heat build-up during cutting.
• Align the tap square to the workpiece and apply steady clockwise pressure to begin cutting.
• Advance gradually, back off to break the chips, and clean the threads as you proceed to prevent binding.
• Withdraw the tap after a few full rotations to clear chips and verify thread engagement.

Whether you’re retrofitting a car part, assembling a machine frame, or completing a precision metalworking project, the Wiseman M25x1.5 Second Lead HSS Tap is built to deliver reliable threads, durable performance, and consistent results project after project.