Hertel 74147448 Cobalt Drill Bit 35/64 in 1/2 in Shank

Product Description

The HERTEL 74147448 is a reduced shank cobalt drill bit designed for drilling tough, high tensile strength materials in demanding shop and field environments. The bit features a 35/64 inch (0.5469 inch decimal) cutting diameter with a 1/2 inch straight-cylindrical shank, allowing it to fit standard 1/2 inch chucks while drilling an oversized bore. The 118-degree standard point angle provides a good balance of centering ability and cutting efficiency on hard steels and alloys. An oxide straw finish reduces friction and offers light corrosion resistance during storage and use. Machinists, tool and die makers, and maintenance technicians typically deploy this bit for production or maintenance drilling operations.

This reduced shank drill bit is suited for applications involving tough high tensile strength ferrous and non-ferrous materials where a standard high-speed steel bit would wear prematurely. The cobalt construction provides elevated heat resistance, making it appropriate for drilling stainless steel, hardened alloys, and similar challenging workpiece materials. With a 3 inch flute length and 6 inch overall length, it handles moderate drilling depths in both manual and machine-fed setups such as drill presses, knee mills, and CNC machining centers.

Key Features

• Cobalt tool material for superior heat and wear resistance on tough high tensile strength materials
• 35/64 inch cutting diameter (0.5469 inch decimal) with a reduced 1/2 inch straight-cylindrical shank for standard chuck compatibility
• 118-degree standard point angle for reliable centering and general-purpose cutting geometry
• Right-hand spiral flute with regular helix for efficient chip evacuation
• Oxide straw finish reduces friction and provides light surface protection
• 6 inch overall length with 3 inch flute length and 3 inch maximum drilling depth

Compatibility

Designed for use in any drill press, milling machine, or CNC setup with a 1/2 inch or larger chuck capacity. Intended for drilling tough high tensile strength materials including hardened steels and difficult alloys.

Installation Notes

Install this bit in a 1/2 inch keyed or keyless chuck, ensuring the shank is fully seated and the chuck is firmly tightened before operation. Secure the workpiece with appropriate fixturing to prevent rotation or movement during drilling. Use cutting fluid or a suitable metalworking lubricant to extend bit life when drilling dense alloys, even though the bit is rated for dry use. Inspect the cutting edges for wear before each use and replace the bit when point geometry degrades to avoid work hardening the bore entrance.