Hertel 18746 Countersink 1/4 in 120 Deg 4 Flute Hss

Product Description

The HERTEL 18746 is a single-piece high speed steel countersink designed for producing conical seat recesses in metal and compatible workpiece materials. It features a 1/4 inch head diameter and a 120-degree included angle, making it suited for deburring, chamfering, and countersinking operations where a wide-angle seat profile is required. The straight-cylindrical shank measures 1/4 inch in diameter, allowing it to seat securely in standard drill chucks and collet holders. With 4 flutes, the tool distributes cutting load evenly and promotes cleaner chip evacuation during operation. Machinists, tool and die makers, and general metalworking shops are the primary users of this style of countersink.

This countersink is appropriate for bench drill press, CNC, and manual milling machine setups where controlled countersinking depth and angle consistency are important. The 120-degree included angle is commonly specified for metric fastener head recesses and wide chamfer applications. The 1/4 inch shank diameter is compatible with standard collets and drill chucks found in typical shop environments, making it a practical choice for light to medium production work and repair applications.

Key Features

• 1/4 inch head diameter for compact countersinking in tight clearance areas
• 120-degree included angle suited for wide chamfers and metric fastener seat profiles
• 4 flutes for balanced cutting action and improved chip clearance
• High speed steel construction provides adequate hardness for general metalworking applications
• Straight-cylindrical 1/4 inch shank fits standard drill chucks and collet holders

Compatibility

Designed as an OEM-style replacement or direct-use countersink for standard 1/4 inch shank drill chucks and collet systems used in bench drill press, manual mill, and CNC drilling applications.

Installation Notes

Installation is performed by machinists or qualified shop technicians. Secure the straight-cylindrical shank firmly in a compatible collet or drill chuck before operation and verify runout before cutting. Ensure the workpiece is clamped securely to prevent movement during countersinking. Use appropriate cutting fluid for the workpiece material to extend tool life and improve finish quality.