Hertel K027750AS25 Straight Flute Tap M8x1.25 Bottoming Hss

Product Description

The HERTEL K027750AS25 is a straight flute bottoming tap designed for cutting M8x1.25 metric coarse internal threads in blind and through holes. Manufactured from high-speed steel with a titanium nitride coating, this tap delivers improved wear resistance and reduced friction compared to uncoated tooling. The bottoming chamfer allows threading close to the bottom of blind holes, making it well suited for tight-tolerance applications. With 4 flutes and a 6H class of fit, it produces threads within standard metric tolerance ranges. Overall length is 2-23/32 inches and the thread limit is D5. Right-hand thread direction. Installed by machinists and maintenance technicians working with metric fastener systems.

This tap is used in machining and maintenance environments where M8x1.25 metric coarse threads are required in steel, cast iron, aluminum, and similar machinable materials. It is particularly suited for blind-hole applications where a bottoming tap is needed to thread close to the bottom of the hole. Typical install scenarios include production machining, repair shops, and MRO maintenance work on equipment with metric fastener standards.

Key Features

• Bottoming chamfer for threading close to the bottom of blind holes
• Titanium nitride coating increases surface hardness and extends tool life
• High-speed steel construction handles a broad range of machinable materials
• 4 flutes for balanced thread cutting and chip management in straight-flute applications
• 6H class of fit with D5 thread limit meets standard metric tolerance requirements
• Right-hand thread direction, compatible with standard tapping setups

Compatibility

Designed for cutting M8x1.25 metric coarse internal threads as an OEM-style production or replacement tap in standard tapping chucks, tap handles, and CNC tapping fixtures that accept this shank size and overall length.

Installation Notes

This tap is installed and operated by machinists or maintenance technicians using a tap wrench, tapping head, or CNC machining center with rigid or floating tap holder. Always use appropriate cutting fluid for the workpiece material to reduce heat and improve thread quality. Ensure the tap is aligned perpendicular to the workpiece surface before beginning the threading operation. Inspect the tap for wear or chipping before each use and do not force a damaged tap.