Hertel C.40W.1072 Taper Length Drill 27/64 Hss

Product Description

The HERTEL C.40W.1072 is a taper length twist drill bit machined from high-speed steel (HSS) with a black oxide finish. It measures 27/64 inch (0.4219 inches) in diameter and carries a standard 118-degree point angle, which suits general-purpose drilling in steel, cast iron, aluminum, and similar materials. The spiral flute geometry is right-hand cut with a regular spiral type, and the web is thinned and tapered to reduce thrust and improve chip evacuation. Licensed machinists, tool and die makers, and maintenance technicians are the primary installers. Overall length is 7.25 inches with a 4.625-inch flute length, giving it extra reach compared to a jobber-length bit of the same diameter.

This drill bit is suited for production and maintenance drilling applications where a longer reach is required but a full aircraft-extension bit is unnecessary. Common use cases include drilling through structural steel, machinery frames, motor housings, and fabricated assemblies. The straight-cylindrical shank seats directly in standard drill chucks without an adapter, making it compatible with drill presses, magnetic drills, and hand-held power drills equipped with a 27/64-inch or larger chuck capacity.

Key Features

• 27/64 inch (0.4219 inches) diameter with matching straight-cylindrical shank for direct chuck mounting
• 118-degree standard point angle for general-purpose metal drilling
• Black oxide finish reduces friction and provides mild corrosion resistance during storage and use
• Web-thinned, tapered web lowers drilling thrust and improves chip flow in deeper holes
• Taper length body provides extended reach beyond standard jobber length without sacrificing rigidity
• Right-hand spiral flute ejects chips away from the cutting zone on conventional drill press setups

Compatibility

Designed as an OEM-style replacement or direct-fit taper length drill bit for use in any standard drill chuck accommodating a straight-cylindrical shank at 27/64 inch diameter.

Installation Notes

A licensed machinist or qualified maintenance technician should install and operate this bit. Secure the shank fully in the drill chuck and verify runout before drilling. Always power down and lock out the drill press or machine spindle before changing bits. Use appropriate cutting fluid for ferrous materials to extend tool life and maintain hole tolerances.