Hertel K027731AS Spiral Point Tap M4x0.70 Metric Coarse 6H Hss

Product Description

The HERTEL K027731AS is a spiral point tap designed for cutting M4x0.70 metric coarse internal threads in through-hole applications. Made from high-speed steel, it features a plug chamfer and a 2-flute spiral point geometry that pushes chips ahead of the cut, keeping the flutes clear and reducing the risk of chip packing. The 6H class of fit produces threads within standard tolerance for general-purpose metric fastener applications. Right-hand thread direction and D4 thread limit ensure predictable sizing. This tap is suited for production or maintenance environments where consistent M4 metric threading is required in ferrous and non-ferrous materials.

The K027731AS is used in machine shop, maintenance, and fabrication settings where M4x0.70 through-hole tapping is performed. The plug chamfer makes it appropriate for use in CNC machining centers, drill presses, and tapping machines as well as hand tapping operations. Coolant-through is not supported, so external cutting fluid or tap lubricant should be applied at the cutting zone. It is well suited for threading steel, aluminum, and similar materials in both production runs and low-volume repair work.

Key Features

• Spiral point geometry pushes chips forward, preventing packing in through-hole threading
• Plug chamfer provides a gradual lead for starting in CNC and hand tapping applications
• High-speed steel construction offers durability across a range of ferrous and non-ferrous materials
• D4 thread limit maintains consistent tolerance for 6H class of fit metric threads
• Right-hand thread direction for standard metric fastener applications
• 2-flute design balances chip clearance and thread form strength at M4 size

Compatibility

Designed for cutting M4x0.70 metric coarse right-hand internal threads in through-hole applications across general machining, fabrication, and maintenance operations.

Installation Notes

Install this tap in a proper tap holder, collet chuck, or tapping head to maintain axial alignment with the pre-drilled hole. Apply cutting fluid or tapping oil before and during the threading operation to extend tool life and improve thread finish. De-energize and lock out any machine before changing tooling. Follow applicable shop safety procedures and manufacturer drill chart recommendations for correct tap drill diameter prior to tapping.