Keo 919-000-216 Countersink Set 4 Pc Cobalt Steel 82 Deg

Product Description

The KEO 919-000-216 is a 4-piece cobalt steel countersink set designed for right-hand countersinking operations in metal, wood, and composite materials. The set covers a head diameter range of 5/16 to 5/8 inches and an included angle of 82 degrees, making it suitable for standard flat-head fastener seating. Shanks range from 1/4 to 3/8 inches in diameter with straight shank geometry for secure chuck retention. Overall lengths run from 1-5/8 to 2-1/8 inches. The bright, uncoated finish indicates no additional coating treatment. Cobalt steel construction provides elevated heat resistance and hardness compared to standard high-speed steel, supporting use in harder or more abrasive workpiece materials.

This countersink set is intended for use in machine shop, fabrication, and maintenance environments where multiple countersink sizes are needed on a single job. The set accommodates a range of fastener head sizes across four individual tools, reducing the need to source individual countersinks. Tools ship in a plastic storage case for organized keeping and transport. Suitable for use in drill presses, milling machines, or hand-held electric drills with appropriate chuck capacity. This set fits workflows in HVAC panel fabrication, electrical enclosure work, plumbing fixture mounting, and general mechanical assembly.

Key Features

• 4-piece set spans 5/16 to 5/8 inch head diameter range in a single kit
• 82-degree included angle for standard flat-head fastener countersinking
• Cobalt steel construction for improved hardness and heat resistance vs. HSS
• Straight shank in 1/4 to 3/8 inch diameters for broad chuck compatibility
• Bright, uncoated finish - no coating to flake or chip during use
• Includes plastic storage case for organized tool retention on the job

Compatibility

Designed as a general-purpose countersink set compatible with standard drill chucks accepting 1/4 to 3/8 inch straight shanks; suitable for countersinking flat-head fastener clearance holes in metal, wood, and composite materials.

Installation Notes

Install each countersink in a drill press, milling machine, or hand-held drill with a chuck capacity matching the shank diameter of the selected tool. Secure the shank fully in the chuck before operation and verify the workpiece is clamped or fixtured to prevent movement. Operate at appropriate spindle speeds for the workpiece material - harder materials generally require lower RPM. Inspect cutting edges before each use and replace any tool showing chipping or significant wear to maintain countersink geometry.