Kennametal 1604271 Combo Chamfer Countersink Drill

Product Description

The KENNAMETAL 1604271 is a combination chamfer countersink drill designed for indexable insert drilling and chamfering operations in a single pass. Part of the SEFAS series, this tool accepts two 3.42805R001 inserts held in place by a clamp mechanism, reducing tool changes and improving cycle efficiency. The body diameter measures 1.02 inches with an overall length of 4.31 inches. The drill handles diameters ranging from 6 to 8mm, making it well-suited for precision hole-making and chamfering workflows in metalworking environments. Inserts are secured with a clamp, screw, and wrench — all included with the tool. The straight shank connection has a body shank diameter of 19.05mm and a drill shank diameter of 8mm.

This combo drill is used in CNC machining centers and manual mills where combined drilling and chamfering in one operation reduces fixturing time and improves repeatability. The 45-degree chamfer angle is standard for deburring and countersink prep on steel, cast iron, and similar ferrous materials. Typical applications include production machining shops, tool rooms, and maintenance operations requiring consistent hole quality with minimal tool swaps. A licensed machinist or CNC operator familiar with indexable tooling systems is the appropriate installer and user for this tool.

Key Features

• Combines chamfering and countersinking in a single drilling pass at a 45-degree chamfer angle
• Accepts two 3.42805R001 inserts for drill diameter range of 6 to 8mm
• Straight shank connection with 19.05mm body shank diameter and 8mm drill shank diameter
• Body diameter of 1.02 inches and overall length of 4.31 inches
• Insert holding method uses a clamp for secure, repeatable seating
• Includes clamp, screw, and wrench for complete ready-to-use setup

Compatibility

Designed to accept two 3.42805R001 indexable inserts as specified by KENNAMETAL for the SEFAS series. No additional compatible model numbers or machine systems were specified in available product data.

Installation Notes

Installation and insert changes should be performed by a qualified machinist or CNC technician familiar with indexable tooling. Ensure the machine spindle is fully powered down and locked out before mounting or removing the tool. Use the included wrench to secure insert clamp screws to proper engagement — do not overtighten with non-specified tools. Verify shank diameter compatibility with the machine tool holder before installation.