Meet the Wiseman Threading Tools Second Lead Metric HSS Tap in M42x3 — a purpose-built solution for fast, reliable internal threads in a wide range of metals. Ground to precise dimensions and supplied uncoated, this tap is ready to tackle demanding tapping jobs with confidence.

Why this tap stands out

• Second lead geometry: After the chamfering portion begins the cut, the additional lead accelerates thread formation. The result is fewer passes, quicker threading, and improved productivity on through-holes and deep taps.
• High-speed steel, ground thread: Engineered for accuracy and long tool life, delivering clean, consistent thread profiles and smooth operation in manual or machine tapping setups.
• Uncoated for versatility: Without coatings, you can tailor lubrication to your material and tool setup, maximizing performance across different metals and environments.
• ISO 529 compliant: Precise metric threading that aligns with standard internal thread tolerances, ensuring compatibility with mating fasteners and components.
• Right-hand thread: The conventional threading direction for most applications, providing predictable results in standard fabrication and maintenance work.
• USA Plug lead configuration: A practical lead style suited for dependable chip evacuation and consistent cutting action in typical through-hole projects.
• General-purpose industrial tap: Ideal for engineers, machinists, and technicians who need a robust, single-tap solution for M42x3 threading tasks in a variety of metals.

How it helps you get the job done

Whether you’re repairing machinery, fabricating large-diameter components, or performing maintenance on heavy equipment, this tap delivers fast, accurate threads with less effort. Its HSS composition handles demanding materials while the second-lead design keeps cutting force manageable and minimizes tool wear.

Best-use scenarios

• Through-hole threading in steel, cast iron, or similar metals where large M42x3 threads are required.
• Production or maintenance environments where reducing tapping time improves workflow and throughput.
• Hand-tapping with a tap wrench or machine-tapping on a stable setup for precise, repeatable results.

Practical tips for optimal results

• Apply a compatible cutting fluid to improve chip evacuation and extend tap life, especially in tougher materials.
• Start with a light touch and steady, clockwise turns; back off slightly to clear chips after a few turns.
• Ensure the hole is clean and properly deburred before tapping to avoid cross-threading or binding.
• Use the tap in a secure fixture or drill/machine setup to maintain straight alignment and prevent tool breakage.

Specifications at a glance

Thread size: M42 x 3

Thread direction: Right-hand

Lead: Second lead (for faster cutting after initial chamfer)

Material: High-speed steel (HSS)

Finish: Uncoated

Standard: ISO 529

Lead type: USA Plug lead

Usage: General-purpose internal threading