Keo 919-000-236 Countersink 5/16 in Cobalt Steel

Product Description

The KEO 919-000-236 is a single-end countersink designed for countersinking and deburring operations in light-duty machining applications. Built from cobalt steel, this tool offers improved heat and wear resistance compared to standard high-speed steel, making it well suited for harder or abrasive work materials. It features a 5/16 inch head diameter with a 100-degree included angle and a straight-cylindrical 1/4 inch shank for secure chuck mounting. The right-hand cutting direction and burr-free entry geometry make it a reliable choice for machinists and tool-room technicians who need consistent countersink performance without a pilot.

This countersink is intended for use on aluminum, non-metallic materials, and plastics. The cutting diameter range spans 3/32 inch to 9/32 inch, covering a broad range of fastener seat sizes in that spectrum. It is well suited for bench drill presses, CNC machining centers, and hand-held drill applications where a clean, chamfered seat is required ahead of flat-head or oval-head fastener installation. Typical users include machinists, production operators, and maintenance technicians working in light manufacturing or fabrication environments.

Key Features

• Cobalt steel construction for improved heat resistance and tool life over standard HSS
• 100-degree included angle suitable for common flat-head fastener seating
• Cutting diameter range: 3/32 inch to 9/32 inch
• Straight-cylindrical 1/4 inch shank for standard chuck compatibility
• Right-hand cutting direction for conventional drill rotation
• Rated for aluminum, non-metallic materials, and plastics

Compatibility

Designed for countersinking and deburring applications in aluminum, non-metallic materials, and plastics where a 100-degree seat angle and up to 9/32 inch cutting diameter are required.

Installation Notes

This countersink is installed into a standard drill chuck or collet accepting a 1/4 inch straight shank. Secure the workpiece firmly before operation and set spindle speed appropriate for the material being cut. No pilot is included, so center-punching or pre-drilling a pilot hole is recommended for accurate seat placement. Inspect the cutting edges for wear or chipping before each use and replace when edge integrity is compromised.