Value Collection SC1090100 Countersink 90 Degree 1 Flute

Product Description

The VALUE COLLECTION SC1090100 is a single-flute countersink designed for creating chamfered seat profiles in metal and composite workpieces. Built from high-speed steel with a bright uncoated finish, it operates at a 90-degree included angle and a 45-degree centerline angle. The straight-cylindrical shank measures 0.5 inches in diameter, and the head diameter reaches 1 inch. This tool is used by machinists and fabricators to prep holes for flat-head fasteners, deburr bored holes, and create clean entry chamfers on drilled stock. The single-flute geometry suits controlled hand-feed and light machine operations.

This countersink fits standard drill presses, milling machines, and hand-held power drills with a 0.5-inch collet or chuck. It is suited for job shop, maintenance, and production environments where a right-hand cutting direction is required. Typical applications include countersinking through-holes in steel plate, aluminum extrusions, and similar structural materials ahead of flat-head cap screw or machine screw installation. No pilot is included, so the operator centers the tool using the existing drilled hole.

Key Features

• 90-degree included angle produces the correct seat geometry for standard flat-head fasteners
• Single-flute design allows controlled chip clearance and smooth cutting action
• High-speed steel construction provides adequate hardness for ferrous and non-ferrous materials
• Bright uncoated finish — no coating buildup to affect dimensional accuracy at the cutting edge
• Straight-cylindrical shank fits 0.5-inch collets and standard drill chucks without adapters
• Right-hand cutting direction compatible with standard drill press and mill spindle rotation

Compatibility

Designed as an OEM-style single-end countersink for use in drill presses, CNC mills, and hand-held drills equipped with a 0.5-inch capacity collet or chuck accepting straight-cylindrical shanks.

Installation Notes

A licensed machinist or qualified fabricator should secure the shank fully in the chuck or collet before operation and verify runout before cutting. Power down the machine and lock the spindle before changing or adjusting the tool. Feed rate should be controlled to prevent chatter — single-flute countersinks are sensitive to excessive feed pressure. Always wear appropriate eye protection when operating rotary cutting tools.