Hertel 4140661 Cobalt Jobber Drill Bit 4.5 Mm 135 Deg

Product Description

The HERTEL 4140661 is a cobalt jobber-length drill bit designed for demanding holemaking in hard and abrasive materials. It measures 4.5 mm (0.1772 inches) in diameter and runs 86 mm (3-25/64 inches) overall, with a 56 mm (2-13/64 inch) flute length. The 135-degree split point reduces walking at contact and lowers the thrust needed to start a hole. A TiAlN coating improves heat resistance, extending tool life in high-speed or dry cutting applications. The bit uses a straight-cylindrical shank and right-hand spiral flute geometry, and it is web-thinned with a tapered web configuration for improved chip evacuation.

This bit is suited for metalworking and fabrication environments where cobalt tooling is specified for drilling stainless steel, high-alloy steel, cast iron, and other hard metals. It fits the jobber-length series, making it a standard-reach option for drill presses, lathes, CNC machining centers, and hand-held power drills. The Max Output grade designation indicates it is built for production-rate cutting, not just light-duty or occasional use. Machinists, pipefitters, ironworkers, and maintenance mechanics are the typical end users.

Key Features

• 4.5 mm (0.1772 inch) diameter cobalt construction for high-heat and hard-material drilling
• 135-degree split point reduces walking and decreases required thrust
• TiAlN coating improves thermal resistance and extends tool life in dry or high-speed cutting
• Right-hand cut with regular spiral flute and web-thinned tapered web for efficient chip removal
• Straight-cylindrical shank fits standard drill chucks without additional tooling
• Jobber-length series provides a versatile reach-to-diameter ratio for general holemaking

Compatibility

Designed as an OEM-style jobber drill bit for use in standard drill chucks accepting a 0.1772-inch straight-cylindrical shank, suitable for drill presses, CNC machines, and portable power drills across metalworking and fabrication applications.

Installation Notes

Installation and use of this bit is typically performed by machinists or skilled tradespeople following applicable shop safety procedures. Secure the shank fully in the chuck before operation and verify chuck key removal prior to starting the spindle. Use appropriate cutting fluid or coolant for the material being drilled when conditions allow, as the TiAlN coating supports dry cutting but lubrication can extend tool life further. Inspect the cutting edges before each use and replace the bit if chipping or wear is observed.