Keo 919-000-397 Countersink 1-1/2 in 90 Degree 6 Flutes Hss

Product Description

The KEO 919-000-397 is a single-end, straight-shank countersink designed for deburring and chamfering operations in metal fabrication, machining, and assembly work. It features a 1-1/2 inch head diameter and a 90-degree included angle, which corresponds to a 45-degree centerline angle, making it suitable for standard fastener seat preparation. The cutter body is machined from high-speed steel (HSS) with 6 flutes ground into the head for smooth material removal and chip clearance. The 3/4 inch straight-cylindrical shank seats securely in standard drill press chucks, milling machine spindles, or hand drill chucks used in production or maintenance settings.

This countersink is used in applications where precise, clean chamfers are needed ahead of flathead screw or bolt installation. It is suited for use in ferrous and non-ferrous metals where HSS cutting performance is appropriate. Machinists, tool and die technicians, maintenance mechanics, and metalworking tradespeople use this tool in both shop and field setups. The 6-flute geometry reduces chatter compared to fewer-flute designs and produces a cleaner finish at moderate spindle speeds.

Key Features

• 1-1/2 inch head diameter for countersinking larger fastener holes
• 90-degree included angle (45-degree centerline angle) matches standard flathead fastener geometry
• 6-flute design reduces chatter and improves surface finish
• High-speed steel construction provides durability across a range of metals
• 3/4 inch straight-cylindrical shank for compatibility with standard machine chucks
• Right-hand cut for conventional clockwise spindle rotation
• No pilot included - centers on existing drilled hole

Compatibility

Designed as a standard single-end countersink for use in drill presses, milling machines, and hand drills equipped with a chuck capable of accepting a 3/4 inch straight shank. Suitable for general countersinking operations as classified under UNSPSC code 27112812.

Installation Notes

This tool is installed and operated by machinists or qualified metalworking tradespeople using standard machine tooling practices. Always secure the workpiece and ensure the spindle is at a safe, controlled speed before engaging the cutter. Power down and de-energize the machine before inserting or removing the tool from the chuck. Do not use this cutter on hardened steels or materials exceeding the rated capability of high-speed steel tooling.