Hertel K027770AS Straight Flute Tap M12x1.25 Metric Fine

Product Description

The HERTEL K027770AS is a straight flute bottoming tap designed for cutting M12x1.25 metric fine internal threads in blind holes and through holes where full thread depth close to the bottom of the bore is required. Manufactured from high-speed steel with a bright uncoated finish, this tap produces right-hand threads and carries a D5 thread limit, making it suited for controlled-tolerance tapping operations. With four flutes and a 3.375-inch overall length, it is built for use in manual tapping operations or light-duty machine setups where chip evacuation is manageable and the workpiece material is compatible with straight-flute tooling.

This tap is used in metalworking and machining applications requiring metric fine thread profiles, particularly where a bottoming chamfer is necessary to produce usable threads nearly to the full depth of a blind hole. Typical applications include repair work, fixture fabrication, and production threading in materials such as aluminum, mild steel, and similar machinable metals. It is installed by machinists, tool-and-die makers, and maintenance technicians working on equipment with metric fine fastener standards.

Key Features

• Bottoming chamfer allows threading to within 1-2 threads of the bottom of a blind hole
• M12x1.25 metric fine thread size suits precision fastener and machine component applications
• High-speed steel construction provides durability in general-purpose threading operations
• D5 thread limit supports controlled-tolerance fits for metric fine threaded assemblies
• Four-flute design provides stability and thread quality in short-chipping materials
• Right-hand thread direction matches standard fastener conventions

Compatibility

Designed as a standard replacement or working tap for M12x1.25 metric fine tapping applications in hand tapping and compatible machine tapping setups. No specific machine or equipment compatibility was provided in the product data.

Installation Notes

Tapping operations should be performed by qualified machinists or maintenance technicians familiar with thread-cutting tooling and proper speeds and feeds for high-speed steel taps. Always ensure the workpiece is securely fixtured and the tap is properly aligned with the drilled pilot hole before beginning the thread-cutting operation. Use an appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Inspect the tap for wear or damage before each use and replace if chipping or excessive wear is observed.