Cleveland C46159 Countersink 3/8 in 100 Deg 3 Flute Hss

Product Description

The CLEVELAND C46159 is a single-end, straight-shank countersink designed for deburring and seat preparation in carbon steel and cast iron. It features a 3/8 inch head diameter, a 100-degree included angle, and three flutes ground from high speed steel with an oxide finish. The right-hand cutting direction and straight cylindrical shank make it compatible with standard drill chucks and countersink holders. This tool is used by machinists, pipefitters, and maintenance tradespeople who need consistent, clean countersink geometry for fastener seating without a pilot. The 1/4 inch shank diameter allows use in compact chucks and hand-held drilling equipment.

This countersink is suited for production and repair applications where carbon steel or cast iron workpieces require chamfered holes for flat-head fasteners or deburring of drilled bores. The 100-degree included angle matches the seating geometry of many machine screws and structural fasteners used in fabrication and mechanical assembly. It is a single-unit tool without an included pilot, so the operator controls centering through steady feed and proper fixturing. Typical environments include machine shops, millwright work, and field repair settings where a compact, general-purpose countersink is needed.

Key Features

• 3/8 inch head diameter with 100-degree included angle for common fastener seating geometry
• Three flutes provide smooth chip evacuation and consistent finish on steel and cast iron
• High speed steel construction with oxide coating for wear resistance
• 1/4 inch straight cylindrical shank fits standard drill chucks and countersink holders
• Right-hand cut for use with conventional clockwise-rotation drilling equipment
• No pilot included, allowing use across a range of pre-drilled hole sizes

Compatibility

Designed for countersinking operations in carbon steel and cast iron workpieces. Fits standard 1/4 inch straight-shank chucks and countersink cage holders used in drill presses, hand drills, and CNC equipment.

Installation Notes

A licensed machinist or qualified tradesperson should secure the shank firmly in the chuck before operation. Ensure the workpiece is clamped or fixtured to prevent movement during cutting. Use appropriate cutting fluid or lubricant when countersinking steel to extend tool life and improve finish quality. Inspect the cutting edges for wear before each use and replace the tool if chipping or dullness is observed.