Hertel H-81155040000 Combo Drill Countersink Size 4 Hss

Product Description

The HERTEL H-81155040000 is a combination drill and countersink tool designed for simultaneous drilling and countersinking operations in a single pass. Built from high-speed steel with a bright, uncoated finish, this tool features a 5/16-inch body diameter, a 1/8-inch drill point diameter, and a 90-degree included angle for standard countersink profiles. The double-end style extends tool life by providing two usable cutting ends. At 2-1/8 inches overall length, it is suited for bench and machine operations where compact tooling is required. Licensed tradespeople and machinists use this type of tool in drill press, lathe, and CNC setups for fastener seat preparation.

This combo drill countersink is intended for countersinking applications in metal, wood, and composite materials where a clean, properly angled seat is needed for flat-head fasteners. The plain cutting edge style and uncoated HSS construction make it compatible with general-purpose machining environments. It is commonly used in fabrication shops, maintenance facilities, and production settings where trade size 4 countersink geometry is specified.

Key Features

• High-speed steel construction for durability across a range of workpiece materials
• Bright, uncoated finish suitable for general-purpose countersinking operations
• Double-end design provides two cutting ends, extending usable tool life
• 90-degree included angle for standard flat-head fastener seat preparation
• 118-degree drill point angle for consistent center location and entry
• Compact 2-1/8 inch overall length fits standard drill press and machine setups

Compatibility

Designed as an OEM-style replacement or direct-fit option for trade size 4 combo drill countersink applications requiring a 5/16-inch body diameter and 90-degree included angle in standard machining setups.

Installation Notes

Installation and use of this tool should be performed by qualified machinists or tradespeople familiar with drilling and countersinking operations. Ensure the workpiece is securely clamped and the spindle speed is set appropriately for the workpiece material before engaging the tool. Inspect both cutting ends for wear or damage before use, and replace the tool if chipping or deformation is observed. Use appropriate cutting fluid for metal applications to maintain edge life and surface finish quality.