Keo 919-000-371 Countersink 1/8 in 90 Degree 6 Flute Hss

Product Description

The KEO 919-000-371 is a single-end, 6-flute countersink designed for right-hand cutting in metalworking and fabrication applications. Built from high-speed steel, it produces clean, chamfered entries for fastener seating in a wide range of workpiece materials. The tool features a 1/8-inch head diameter, a 90-degree included angle (45-degree centerline angle), and a straight-cylindrical shank measuring 1/8 inch in diameter and 1 inch in length. Machinists, tool and die technicians, and maintenance mechanics install this countersink in drill presses, lathes, or hand-held power tools to prep holes prior to fastener installation.

This countersink is suited for light-duty countersinking operations where precision chamfering at a standard 90-degree angle is required. Its compact 1/8-inch head diameter makes it appropriate for small-diameter hole preparation in sheet metal, aluminum, steel, and similar materials. The straight-cylindrical shank allows straightforward chucking in standard drill chucks or collet holders without additional adapters. It does not include a pilot and is intended for use as a standalone countersinking tool without pilot guidance.

Key Features

• 6-flute geometry for smooth, chatter-resistant cutting action
• 90-degree included angle with 45-degree centerline angle for standard fastener seat preparation
• High-speed steel construction for durability across a range of metalworking applications
• 1/8-inch straight-cylindrical shank for direct chucking in standard drill chucks or collets
• Right-hand cutting direction compatible with standard rotary tool setups
• Single-end design with no pilot - clean, straightforward tool change and setup

Compatibility

Designed as an OEM-style countersinking tool for use in standard drill chucks and collet holders accepting a 1/8-inch straight-cylindrical shank.

Installation Notes

This countersink is installed by a machinist or maintenance technician using a drill press, CNC machine, or hand-held rotary tool equipped with a compatible chuck or collet. Ensure the workpiece is securely clamped before operation to prevent movement during chamfering. Power down and de-energize the machine completely before mounting or removing the tool. Use appropriate cutting fluid for steel workpieces to extend tool life and improve finish quality.