Hertel H-81105504000 Combo Drill Countersink Size 4 Cobalt

Product Description

The HERTEL H-81105504000 is a combo drill countersink designed to drill and countersink in a single operation. Built from cobalt high-speed steel with a bright, uncoated finish, this tool handles both hole creation and seat preparation without a tool change. It carries a trade size of 4 with a 5/16 inch body diameter, a 1/8 inch drill point diameter, and a 118-degree drill point angle. The 60-degree included angle is standard for flat-head fastener seating in metal fabrication and assembly work. Licensed machinists, toolmakers, and production shop technicians are the primary users.

This combo drill countersink is suited for metalworking applications where countersunk holes are required for flat-head screws and fasteners. The plain cutting edge style and double end type make it appropriate for use in manual drill presses, CNC lathes, and mill setups. It is a practical choice for repetitive countersinking tasks in steel, stainless, and other ferrous materials where cobalt tooling provides heat and wear resistance over standard high-speed steel.

Key Features

• Cobalt tool material for improved heat resistance and tool life in ferrous metals
• 118-degree drill point angle for general-purpose metal drilling
• 60-degree included angle for standard flat-head fastener countersinking
• Double end type extends usable tool life
• Bright, uncoated finish maintains dimensional accuracy without coating buildup
• Combines drilling and countersinking into a single pass to reduce cycle time

Compatibility

Designed as a standard trade size 4 combo drill countersink suitable for use in drill presses, CNC lathes, turret lathes, and milling machines that accept 5/16 inch body diameter countersink tooling.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom technicians familiar with cutting tool setup and speeds and feeds for cobalt tooling. Secure the tool firmly in the appropriate collet or chuck before operation and verify runout before cutting. Always power down and lock out the machine before changing tooling. Do not exceed the recommended RPM range for the workpiece material and tool diameter.