Hertel K027731AS25 Spiral Point Tap M4x0.70 Metric Coarse

Product Description

The HERTEL K027731AS25 is a spiral point plug tap designed for cutting M4x0.70 metric coarse threads in through-hole applications. Made from high-speed steel with a titanium nitride (TiN) coating, it delivers extended tool life and reduced friction during tapping operations. The plug chamfer style distributes cutting load gradually across the leading threads, making it well suited for general-purpose production tapping. With a 2-flute spiral point geometry, chips are pushed ahead of the tap and out of the hole, keeping the cutting zone clear. The 6H class of fit meets standard metric tolerance requirements for most fastener and assembly applications.

This tap is intended for use in ferrous metals, aluminum, and other machinable materials where M4x0.70 metric coarse internal threads are required. It is commonly used by machinists and maintenance technicians in job shop, production, and field repair environments. The right-hand thread direction suits standard clockwise-feed tapping operations on manual machines, drill presses, and CNC machining centers. The 0.75-inch thread length provides adequate engagement for typical M4 through-hole threading tasks in sheet metal and light structural components.

Key Features

• M4x0.70 metric coarse thread form with 6H class of fit for standard metric tolerance
• High-speed steel construction provides toughness across a broad range of workpiece materials
• TiN coating reduces friction and extends cutting edge life compared to uncoated HSS
• Spiral point geometry pushes chips forward through the hole, reducing clogging in through-hole tapping
• Plug chamfer distributes cutting load over multiple leading threads for smooth entry
• Right-hand cut, D4 thread limit suits standard tolerance stackup requirements

Compatibility

Designed as an OEM-style replacement or direct-use tap for any application requiring M4x0.70 metric coarse internal threads with a 6H class of fit in through-hole configurations.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician familiar with tapping speeds and feeds for the workpiece material. Ensure the tap is properly aligned with the drilled pilot hole before engaging the drive to avoid tap breakage. Use a suitable tapping fluid or cutting oil for the workpiece material to maximize tool life and thread quality. Coolant-through is not supported on this tap, so external lubrication is required.