Hertel 74146440 Taper Length Drill Bit 5/64 in Cobalt

Product Description

The HERTEL 74146440 is a taper length twist drill bit built for demanding metal-cutting applications. Manufactured from cobalt high-speed steel and finished with a TiAlN coating, it delivers heat resistance and wear life well beyond standard HSS bits. The 135-degree split point reduces walking and cutting force at entry, making it well suited for hard and work-hardening materials. The straight cylindrical shank allows use in standard drill chucks without an adapter. Machinists, maintenance technicians, and fabricators reach for this bit when working in alloy steel or stainless steel where tool life matters.

This bit is designed for taper length drilling operations in ferrous metals, including alloy steel and stainless steel. The 2-inch flute length and 3.75-inch overall length make it appropriate for moderate-depth holes where a jobber-length bit may lack rigidity or a long-series bit would be excessive. The right-hand spiral flute evacuates chips efficiently in both hand-held and machine-spindle setups. It is sold individually and typically used in drill presses, CNC machining centers, and manual knee mills.

Key Features

• Cobalt steel construction resists heat buildup when cutting hard ferrous alloys
• TiAlN coating extends surface hardness and reduces friction at elevated temperatures
• 135-degree split point starts on contact and reduces thrust force
• Web-thinned, tapered web reduces cutting resistance through the full flute depth
• Right-hand regular spiral flute promotes consistent chip evacuation
• Straight cylindrical shank fits standard drill chucks without a reduction sleeve

Compatibility

Designed as an OEM-style taper length drill bit suitable for use in alloy steel and stainless steel applications with standard straight-shank drill chucks and collet holders.

Installation Notes

Installation is performed by machinists or maintenance technicians in machine shop or field fabrication settings. Secure the shank fully in a properly sized drill chuck or collet before operation. Use appropriate cutting fluid or coolant for stainless steel or alloy steel to maximize tool life, noting this bit does not support through-spindle coolant delivery. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is present.