Engineered for precise, reliable left-handed threading, the Wiseman Second Lead Metric HSS Tap in M4.5 x 0.75 delivers clean, repeatable results in a variety of metalworking projects. This is a high-speed steel, ground thread tap designed for general-purpose internal threading with ISO 529 dimensions, and it comes in a left-hand, second-lead configuration that’s optimized for efficient chip evacuation and faster cutting action.

Key features at a glance

• Left-hand thread, Second Lead — cuts reverse-threaded holes that resist loosening in vibrating assemblies; the second-lead geometry provides quicker material removal and smoother start-up.
• High Speed Steel (HSS), ground finish — sharp, durable cutting edges when paired with appropriate tapping fluid; uncoated for versatile use across a range of metals.
• ISO 529 compliant, metric size — respectful of standard tapping practices, ensuring compatibility with common drill sizes and tooling setups.
• M4.5 x 0.75 pitch — a precise metric thread suitable for compact fasteners and lightweight assemblies where space and weight matter.
• USA plug lead geometry — designed to integrate smoothly with typical workshop configurations that expect this lead type.

Where to use this tap? It’s ideal for creating internal left-handed threads in steel, aluminum, and other machinable metals where anti-rotation or reverse-thread fasteners are required. Think of brake components, locking assemblies, or mechanisms that must resist unscrewing under vibration. The combination of a robust HSS core, a sharp ground finish, and ISO-standard dimensions makes this tap a dependable choice for both professional machinists and serious DIY enthusiasts.

Practical uses and tips

• Pair with a compatible pilot drill (often around 3.7 mm for M4.5 x 0.75, depending on the material) and a quality tapping fluid to maximize life and reduce breakout.
• Turn steadily with light, consistent pressure; let the tap cut the threads rather than forcing it, and back off slightly to clear chips as you advance.
• Use when assembling components that require a left-hand fastener to prevent loosening from reverse forces or vibration.
• Store and maintain the tool dry and clean to preserve the sharpness of the ground edges for longer life.

Designed for durability and precision, the Wiseman Second Lead Left Hand Tap in M4.5 x 0.75 is a focused, high-accuracy choice for engineers, machinists, and fabricators who demand trustworthy left-hand threading performance in a compact, general-purpose tool.