Hertel 16691396 Straight-flute Carbide Drill Bit 0.266 in

Product Description

The HERTEL 16691396 is a straight-flute carbide drill bit designed for precision drilling in hard and difficult-to-machine materials. With a 0.266 inch (Letter H) diameter, a 140-degree notched point, and a web-thinned tip geometry, it delivers clean entry and reduced thrust when working through tough stock. The C2 carbide grade provides the hardness needed for demanding production and maintenance applications. At 2.6875 inches overall length with a 1.5 inch flute length, it is suited for short-hole and controlled-depth work where rigidity matters. This bit is sold individually and is appropriate for use by machinists, maintenance mechanics, and tool-and-die professionals.

This drill bit is built for right-hand cutting in ferrous and high-strength materials including stainless steel, steel, chrome alloy, heat-treated alloy, nickel alloy, and titanium alloy. It fits standard drill chucks and is appropriate for CNC machining centers, drill presses, and manual operations where straight-flute geometry is preferred over spiral fluting — particularly in thin-wall or through-hole applications where chip ejection is managed by the operator or coolant system. Coolant-through capability is not supported on this model.

Key Features

• Straight-flute geometry preferred for thin-wall and brittle-material drilling where spiral flutes may cause chatter
• C2 carbide grade provides high wear resistance in hard ferrous and exotic alloys
• 140-degree notched point reduces thrust and centers the bit without a pilot hole
• Web-thinned design lowers cutting force and extends tool life in production runs
• Bright uncoated finish maintains dimensional accuracy and allows visual inspection of cutting edges
• Diameter tolerance of +0.0000 to -0.0005 inches ensures close-fit hole sizing

Compatibility

Designed as a straight-flute carbide drill bit for use in standard drill chucks and collet systems accepting a 0.266 inch shank diameter. Primary workpiece materials include chrome alloy, heat-treated alloy, nickel alloy, stainless steel, steel, and titanium alloy.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance professionals familiar with cutting tool setup and speeds-and-feeds selection for carbide tooling. Secure the bit fully in a properly sized chuck or collet before operation and verify runout before beginning a cut. Do not exceed the recommended maximum drilling depth of 2.688 inches for this tool length. Carbide tooling is brittle — avoid interrupted cuts or side loading that can cause chipping or fracture.