Precision threading with ease—introduce the Wiseman Threading Tools Bottom Lead Metric HSS Tap Left Hand – M9x1. This high-speed steel (HSS) tap is ground for accuracy, uncoated for versatile, general-purpose cutting, and built to deliver clean, repeatable left-hand threads in a variety of metals.

The tap is manufactured to ISO 529 dimensions and features a left-hand thread with a bottom lead design. The bottom lead helps the thread start and engage smoothly in restricted or blind holes, reducing chatter and promoting straighter, deeper threads with fewer passes.

Key specifications

• Type: HSS threading tap, ground, uncoated
• Thread direction: Left-hand
• Size: M9 x 1 (9 mm diameter, 1 mm pitch)
• Lead: Bottom lead design
• Standards: ISO 529
• Applications: General-purpose tapping in a wide range of metals

Why this Wiseman tap stands out

• Precision-ground geometry ensures consistent thread depth and pitch for reliable fastener compatibility
• Uncoated finish offers broad compatibility with cutting oils and coolants, without coating-related limitations
• Left-hand threading capability supports reverse-rotation applications and special-fit assemblies
• Compact, durable construction makes it suitable for hand tapping with a tap wrench or machine-assisted work in tight spaces

Practical use cases

• Installing left-hand threaded fasteners in automotive, machinery, and bicycle components
• Repairing or reproducing reverse-threaded connections in old or custom hardware
• Prototyping or repair work where a dependable left-hand thread is required for removable assemblies

How to use

• Prepare the hole: drill the recommended core hole according to ISO 529 for M9x1
• Lubricate: apply a light cutting oil to reduce heat and improve chip evacuation
• Align and start: keep the tap straight in the hole, then rotate counterclockwise to cut the left-hand thread
• Progress and clear chips: advance with steady pressure, pausing to clear chips to avoid over-tapping
• Verify: check the finished thread with a gauge to ensure correct depth and pitch

Included in the listing

• 1 x Wiseman Threading Tools Bottom Lead Metric HSS Tap Left Hand – M9x1