Wiseman Threading Tools Spiral Flute Metric HSS Tap Right Hand - M20x2.5 is engineered for precision tapping in metal, delivering dependable, repeatable threads with every cut. This high-speed steel ground thread tap is uncoated for general-purpose use, adheres to ISO 529 dimensions, and features a spiral flute paired with a right-hand thread for common threading tasks.

Why this spiral-flute HSS tap stands out

• Efficient chip evacuation with a spiral flute—the helical flute channels chips away from the cutting edge during rotation, reducing friction, minimizing the risk of jamming in deep or blind holes, and yielding cleaner threads. This makes it especially reliable for through-holes and challenging bores.
• ISO 529 compliant design—built to standard thread geometry, ensuring compatibility with a wide range of machines and tapping setups while delivering consistent pitch and thread form.
• Right-hand thread for general-purpose use—optimized for standard forward threading operations in common metals, including steel, cast iron, and aluminum. The uncoated HSS provides predictable cutting behavior and straightforward lubrication needs.
• Durable, precision-ground construction—M20x2.5 size with a robust cutting edge and a precisely ground shank to promote accuracy and repeatable results across multiple taps. For best results, pair with appropriate tapping fluid and a stable fixture.
• Recommended tapping drill size—tapping drills for M20x2.5 typically fall around 17.5 mm, with exact size depending on material and coatings; consult a tapping chart to select the perfect drill size for your workpiece.

Ideal use cases and practical tips

Whether you’re assembling a machined chassis, fabricating a custom bracket, or repairing a threaded bore, this Wiseman M20x2.5 spiral-flute tap is designed to deliver precise threads with reliability. Use a suitable cutting oil or tapping fluid, secure the workpiece firmly, and apply steady, even pressure while maintaining a consistent rotation direction. The spiral flute’s chip-conveying action helps maintain cutting efficiency in deeper holes, reducing heat and wear on the tool.

Care and storage are straightforward: keep the tap dry, clean, and stored in a dedicated tool chest to prevent corrosion and nibbling of the cutting edges. The uncoated finish offers predictable performance that can be refreshed by professional regrinding as needed.