Accupro T1660244 Spiral Point Tap M4x0.70 3 Flute Plug 6H

Product Description

The ACCUPRO T1660244 is a spiral point tap designed for cutting M4x0.70 metric threads in through-hole applications. This plug chamfer tap drives chips forward ahead of the cutting edge, making it well suited for production threading in open-ended or through holes. It is manufactured from vanadium high-speed steel for improved wear resistance and toughness compared to standard HSS. An oxide coating reduces friction and helps resist heat buildup during tapping operations. With 3 flutes and a D4 thread limit, it produces 6H class of fit threads with consistent dimensional accuracy. The thread length is 0.512 inches, the shank diameter is 0.168 inches, and the neck length is 0.767 inches. Machinists and metalworking tradespeople are the primary users of this tap.

This tap is intended for threading M4x0.70 through holes in ferrous and non-ferrous metals including steel, cast iron, aluminum, and similar machinable materials. The plug chamfer entry is the most common tap style for general-purpose production work and fits standard tapping operations on drill presses, CNC machining centers, and manual tapping arms. The right-hand thread direction suits standard clockwise threading operations. Coolant-through capability is not included, so external cutting fluid application is recommended to prolong tool life in harder materials.

Key Features

• M4x0.70 metric thread size with 6H class of fit for standard tolerance threading
• Spiral point design drives chips forward, ideal for through-hole tapping
• 3-flute geometry balances chip clearance and cutting edge strength
• Vanadium high-speed steel construction for improved toughness and wear resistance over standard HSS
• Oxide coating reduces friction and heat at the cutting zone
• Plug chamfer provides easy starting and is suited for general production use
• D4 thread limit for consistent fit within 6H tolerance range

Compatibility

Designed as an OEM-style replacement or standard production tap for M4x0.70 through-hole threading applications in metalworking operations.

Installation Notes

This tap should be installed in a tap holder, tapping chuck, or collet sized to the 0.168-inch shank diameter before use. Secure the workpiece and ensure the tap is aligned perpendicular to the hole to avoid thread damage or tap breakage. Apply an appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. Follow standard shop safety procedures including eye protection when operating tapping equipment.