Value Collection SC4090020 Countersink 90 Degree 3 Flute Hss

Product Description

The VALUE COLLECTION SC4090020 is a single-end, 3-flute countersink designed for right-hand cutting in metal and general-purpose materials. Built from high-speed steel with a bright, uncoated finish, it delivers clean, accurate countersunk holes at a 90-degree included angle and a 45-degree centerline angle. The 1/4-inch straight-cylindrical shank seats securely in standard drill chucks and collet holders. With a 5/16-inch head diameter and no pilot, this countersink is suited for precise hand-fed or machine-fed countersinking operations where the operator controls depth and alignment directly.

This countersink is intended for countersinking operations in ferrous and non-ferrous metals, plastics, and similar materials. It fits standard drill presses, CNC mills, and hand drills with 1/4-inch or larger chuck capacity. Machinists, tool-and-die workers, and maintenance technicians use this style of countersink to prepare fastener seats for flat-head screws, rivets, and similar hardware in both production and repair settings.

Key Features

• 90-degree included angle for standard flat-head fastener seating
• 3-flute design provides smooth cutting action and reduces chatter
• High-speed steel construction handles a wide range of workpiece materials
• 1/4-inch straight-cylindrical shank fits common drill chucks and collet holders
• Bright, uncoated finish allows easy visual wear inspection
• No pilot required, giving the operator direct control over positioning

Compatibility

Designed as a general-purpose countersink compatible with drill presses, milling machines, and hand drills equipped with a 1/4-inch or larger chuck or collet.

Installation Notes

Installation is performed by machinists or maintenance technicians using standard rotating machine tools. Secure the shank firmly in the chuck or collet before operation and confirm the workpiece is clamped to prevent movement. Use appropriate cutting fluid or lubricant when working with ferrous metals to extend tool life and improve finish quality. Always deactivate the machine and allow the spindle to come to a full stop before adjusting depth or removing the tool.