Hertel 74146994 Taper Length Drill Bit No. 15 Cobalt

Product Description

The HERTEL 74146994 is a taper length cobalt drill bit designed for demanding metal drilling applications where standard-length bits fall short. Built from cobalt high-speed steel and coated with TiAlN (titanium aluminum nitride), it handles elevated cutting temperatures and maintains edge hardness longer than uncoated HSS tooling. The bit measures 0.1800 inches in diameter (wire gauge No. 15), with a 3-3/8-inch flute length and a 5-3/4-inch overall length. The 135-degree split point geometry reduces walking and lowers thrust requirements at entry. Right-hand spiral flute configuration evacuates chips efficiently during through-hole and deep drilling operations.

This bit is suited for machining and fabrication environments where alloy steel and stainless steel are the primary workpiece materials. The taper length format provides additional reach compared to jobber-length drills, making it practical for drilling through thicker stock or in recessed locations. It is a common choice for tool rooms, maintenance shops, and production setups running manual or CNC drill presses. Straight-cylindrical shank accepts standard three-jaw drill chucks without adapters.

Key Features

• Cobalt construction resists heat buildup when drilling hardened alloy and stainless steel
• TiAlN coating extends tool life and reduces friction at the cutting edge
• 135-degree split point reduces entry walking and lowers required feed force
• Taper length body adds reach beyond standard jobber-length drills
• Web-thinned, tapered web design improves chip clearance and reduces torque
• Right-hand, regular spiral flute promotes consistent chip evacuation

Compatibility

Designed for use in any standard drill press, mill, or handheld driver accepting a straight-cylindrical shank. Rated for drilling alloy steel and stainless steel workpieces.

Installation Notes

Secure the straight shank firmly in a calibrated three-jaw chuck before operation and verify runout before drilling hardened materials. Always power down the machine and bring the spindle to a full stop before changing bits or clearing chips. Use appropriate cutting fluid or coolant when drilling stainless steel or alloy steel to extend tool life and improve surface finish. Eye protection and machine guarding compliant with applicable shop safety standards should be in place before drilling begins.