Kennametal 6388673 Carbide Replaceable Tip Drill 21mm

Product Description

The KENNAMETAL 6388673 is a solid carbide replaceable tip drill designed for precision hole-making in metalworking applications. This tip is part of the KTFS series and features a 143-degree included angle drill point geometry, an HPG insert profile, and an AlTiN (aluminum titanium nitride) coating applied via PVD process. The AlTiN finish provides thermal resistance and wear protection suited for dry or semi-dry cutting conditions. Cutting diameter is 21mm (0.8268 inches). The tip mounts in compatible KTFS-series drill bodies and is intended for installation and replacement by machinists and tool-crib technicians in production or job-shop environments.

This replaceable tip is used in CNC machining centers and drilling operations where hole diameter accuracy and tool economy are priorities. The KTFS system allows worn or damaged tips to be swapped without replacing the entire drill body, reducing tooling cost per hole. Typical applications include drilling into steel, stainless steel, and other ferrous materials where the KCP15A carbide grade and AlTiN coating provide adequate edge retention and heat resistance. The insert seat size designation is Z, which determines body compatibility.

Key Features

• 21mm (0.8268 inch) cutting diameter for close-tolerance drilling
• Solid carbide tip with KCP15A manufacturer grade for wear resistance in ferrous materials
• AlTiN coating via PVD process for thermal protection and extended tool life
• 143-degree drill point angle with HPG insert geometry for controlled chip formation
• Insert seat size Z for compatibility with matching KTFS-series drill bodies
• Replaceable tip design reduces tooling cost by eliminating full drill replacement

Compatibility

Designed for use with KTFS-series drill bodies accepting insert seat size Z. Verify body size and seat designation before ordering to confirm fit.

Installation Notes

Installation and tip changes should be performed by qualified machinists or tooling technicians. Always power down and lock out the spindle before accessing the tool holder or changing the tip. Follow the drill body manufacturer torque guidelines for the clamping screw to ensure proper seating and runout control. Inspect the insert seat for chips or contamination before installing a new tip.