Hertel H-81155L04040 Combo Drill Countersink Hss Size 4

Product Description

The HERTEL H-81155L04040 is a combination drill and countersink designed for simultaneous drilling and countersinking in a single operation. Built from high-speed steel with a bright uncoated finish, this tool handles pilot hole creation and seat preparation in one pass, reducing setup time and tool changes. It features a 5/16 inch body diameter, a 1/8 inch drill point diameter, and a 118-degree drill point angle. The 90-degree included angle on the countersink profile suits standard flat-head fastener applications. At 4 inches overall length, it fits most standard drill chucks and drill press setups used in metalworking, woodworking, and fabrication environments.

This combo drill countersink is suited for machinists, fabricators, and maintenance professionals working in light manufacturing, machine shops, and general metalworking. The double-end cutting style and plain cutting edge make it a dependable choice for production countersinking where consistent seat geometry is required. It is sized for trade size 4 applications and is classified as a long-length tool, giving additional clearance in deeper workpiece setups.

Key Features

• Combination drill and countersink performs pilot drilling and seat prep in one pass
• High-speed steel construction for durability in metal and wood applications
• 118-degree drill point angle for standard general-purpose drilling
• 90-degree included angle suits flat-head and countersunk fastener profiles
• Double-end design extends tool life by providing two usable cutting ends
• Long-length classification provides clearance for deeper or obstructed workpieces

Compatibility

Designed as a standard combo drill countersink for trade size 4 applications, compatible with drill presses, CNC machines, and hand drills accepting a 5/16 inch shank in typical metalworking and fabrication setups.

Installation Notes

This tool is installed by machinists and fabricators in drill press, mill, or hand-drill applications. Secure the shank firmly in the chuck before operation and verify spindle speed is appropriate for the workpiece material and tool diameter. Ensure the workpiece is clamped securely to prevent movement during the countersinking operation. Inspect the cutting edges for wear before each use and replace the tool if chipping or dulling is observed.