Wiseman Threading Tools Bottom Lead Metric HSS Tap Left Hand - M4x0.7

The Wiseman Threading Tools Bottom Lead Metric HSS Tap Left Hand - M4x0.7 is a precision-ground, uncoated high-speed steel thread tap designed for reliable left‑hand threading in metric sizes. Built to ISO 529 dimensions, this tool delivers consistent pitch and accurate thread depth, making it a dependable choice for both professional workshops and serious DIY projects.

• Left-hand thread: creates reverse-direction threads, ideal for assemblies where the fastener must tighten in the opposite direction or resist vibration-induced loosening.
• Bottom lead (bottoming) profile: engages the full thread length, enabling deep, complete engagement in blind holes or when a full-depth left-hand thread is required.
• Metric size M4x0.7: conforms to ISO 529 standards for a precise, compatible thread history with standard metric screws and components.
• HSS, uncoated: delivers robust wear resistance and predictable cutting action across a range of common metals, with no coating to peel or chip under normal tapping conditions.
• Ground flutes: precision-ground geometry improves cutting efficiency, reduces chatter, and promotes clean chip removal for smoother threading.

Use cases and ideal applications

• Fabrication tasks requiring a left-handed M4 thread, such as mounting fixtures, brackets, or housings where reverse threading is necessary for secure, vibration-resistant assemblies.
• Repairs or retrofits in small-machining projects, electronics enclosures, or mechanical assemblies that need a reliable, full-depth left-hand thread.
• Working in through-holes or blind holes where a bottoming tap ensures threaded engagement to the bottom of the hole.

How to get the best results

1. Drill the appropriate pilot or root hole size according to ISO 529 for M4x0.7 left-hand threads.
2. Secure the tap in a proper tap wrench or machine tap holder. Apply a suitable cutting fluid or oil to reduce friction and extend tool life.
3. Begin turning counterclockwise to cut the left-hand thread, maintaining steady pressure and clean chip clearance as you advance.
4. Advance to the required depth, then back off gradually to break the chip and complete the thread without binding.

Why choose this Wiseman tap

• Reliable, general-purpose performance for metric left-hand threading where reverse-thread engagement is essential.
• ISO 529 compliant dimensions ensure compatibility with standard M4 fasteners and components.
• Precision ground, uncoated HSS offers durability and predictable cutting behavior across common metals.

What you get

• 1 x Wiseman Threading Tools Bottom Lead Metric HSS Tap Left Hand - M4x0.7

Tip for best results: store this tap in a dry, protected environment and use proper lubrication on every cut to maintain edge geometry and extend tool life. This tap is crafted for accuracy, durability, and dependable left-hand threading in metric applications—perfect for users who value precision in every threaded connection.