Introducing the Wiseman Threading Tools Bottom Lead Metric HSS Tap Left Hand - M32x1.5, a purpose-built hand-tapping solution engineered for precision, durability, and reliability in metric threading applications. This left-hand, bottoming tap is designed to finish threads all the way to the bottom of the hole, making it ideal for blind holes and demanding assemblies where reverse-threading is required.

Why this Wiseman tap stands out

• Left-hand thread capability engineered for reverse-thread applications. This tap is designed to cut in the opposite direction, providing reliable engagement in assemblies that require left-handed fasteners.
• Bottom lead geometry ensures full thread depth to the bottom of the hole, a crucial feature for finishing blind holes cleanly and consistently. This is a hallmark of ISO 529-compliant hand taps and is paired with comprehensive lead options in Wiseman’s range.
• Metric size M32x1.5 aligns with ISO metric threading standards, enabling precise, interchangeable results across compatible components.
• High-speed steel (HSS) ground thread provides robust cutting performance, good edge retention, and dependable reuse in general metalworking tasks. The uncoated finish keeps the tool versatile for a wide range of materials.
• ISO 529 dimensions ensure predictable geometry and compatibility with standard tapping practices, including the recommended sequence of taper, plug (second), and bottoming taps for complete thread depth.

How to use this bottom lead left-hand tap

Prepare the hole and secure the workpiece. Use a quality tap wrench or suitable tapping machine, aligning the M32x1.5 thread with the hole. Apply a light cutting fluid to reduce friction and heat, then advance gradually to avoid chatter or deflection. For blind holes, begin with a taper lead, progress to a plug (second) lead, and finish with the bottoming (bottom) lead to reach full thread depth. This approach follows ISO 529 guidance and ensures clean engagement and repeatable results.

Specifications at a glance

• Thread type: Left-hand metric thread (M32 x 1.5)
• Lead: Bottoming (bottom lead) for complete depth
• Material: High-speed steel (HSS), ground thread
• Finish: Uncoated
• Standards: ISO 529 compliant

Who is this ideal for?

Mechanics, fabricators, and engineers tackling reverse-threaded components or anti-loosening applications in metalworking projects. It’s well-suited for repairs, prototyping, and production tasks where precise, durable left-handed threads are required, particularly in steel, cast iron, and aluminum workpieces. The M32x1.5 size is a common metric pitch for medium-diameter fasteners, making this tap a versatile addition to any professional toolkit. For those building or maintaining equipment with reverse-threaded fasteners, this Wiseman tap provides predictable performance and reliable results.

Note: In line with Wiseman’s philosophy, the Bottom Lead taps are part of a family that includes taper and intermediate leads, designed to cover the full tapping sequence when used together. ISO 529 guidance supports using a full set to achieve best results and minimize tool breakage.