The Wiseman Threading Tools Bottom Lead Metric HSS Tap Right Hand - M30x3.5 is a purpose-built cutting tool designed for reliable, accurate internal threading in metalworking projects. Crafted from ground high-speed steel and finished uncoated, this tap delivers consistent thread quality across a range of common materials while offering the versatility to work with your favorite cutting fluids and lubrication routines. Compliant with ISO 529 specifications, it ensures the correct thread form every time, reducing the risk of cross-threading and rejected parts.

What makes this Wiseman tap stand out

• Material and finish: Ground high-speed steel provides excellent rigidity and wear resistance for repeated use, while the uncoated surface invites your preferred cutting fluids for optimal heat management and finish.
• Bottom lead design: Engineered for smooth entry and steady cutting progress, this design helps you achieve clean threads deeper into the hole with less wandering, even in tougher base materials.
• Right-hand thread: The standard threading direction for most fasteners and assemblies, ensuring compatibility with a wide array of components and applications.
• Metric accuracy: Precisely machined to M30x3.5 with ISO 529 geometry, delivering consistent pitch, depth, and thread profile that's dependable across machines and setups.
• General-purpose versatility: Suitable for steel, cast iron, and non-ferrous metals in both hobbyist workshops and professional machine shops, making it a reliable core tap for everyday threading tasks.

Practical uses and best practices

Use this tap to create or repair internal threads for components such as housings, brackets, and fastener receptacles that require a robust M30x3.5 thread. For best results, pair with a correctly sized pilot hole and a steady, perpendicular tapping motion. Maintain consistent lubrication to minimize heat buildup and chip buildup, and back off the tap periodically to break and clear chips for a smoother finish. The tool’s geometry is optimized for reliable performance in through holes and, with proper technique, can deliver precise threads that mate cleanly with corresponding fasteners.

Who this is ideal for

• Professional machinists and metal fabricators working on high-diameter, metric-threaded assemblies.
• Engineers and technicians performing repairs or custom fabrications where dependable, repeatable thread quality is essential.
• Hobbyists looking for a durable, versatile tap that still offers professional-grade results.

Technical snapshot

Product type: Threading tap

Material: High-speed steel (HSS)

Finish: Uncoated

Thread direction: Right-hand

Lead: Bottom lead

Standard: ISO 529

Thread: M30 x 3.5

Applications: Internal threads in metal, general-purpose tapping

With the Wiseman name behind it, this bottom lead HSS tap is designed to be a dependable workhorse in your tapping toolkit—capable, precise, and ready to handle a variety of material families without the fuss of coatings or complex setup. Add it to your shop for consistently accurate M30x3.5 threads that fit right the first time.