Hertel 4140406 Cobalt Jobber Drill Bit No. 48

Product Description

The HERTEL 4140406 is a No. 48 wire-size cobalt jobber-length drill bit designed for heavy-duty holemaking in tough materials. The bit measures 0.0760 inches in diameter with a 2-inch overall length and a 1-inch flute length. A 135-degree split-point tip reduces walking on entry without requiring a center punch, and the TiAlN coating extends tool life by reducing heat buildup and wear during high-speed or repetitive drilling. The right-hand cutting geometry is standard for conventional drill press and hand-drill use. This drill is built for machinists, maintenance technicians, and metalworking shops that demand consistent performance from small-diameter bits.

The 4140406 is suited for drilling ferrous metals, stainless steel, high-strength alloys, and other difficult materials where standard high-speed steel bits wear prematurely. At 0.0760 inches, this bit falls within the small-diameter wire gauge range commonly used for precision hole work in sheet metal fabrication, electronics enclosures, tooling fixtures, and general maintenance applications. The heavy-duty cobalt grade and TiAlN coating make it a practical choice when heat generation and tool wear are primary concerns on the shop floor or in the field.

Key Features

• No. 48 wire size, 0.0760-inch diameter for precision small-bore applications
• Cobalt construction rated for heavy-duty use in hard and abrasive materials
• TiAlN coating reduces friction and thermal wear for extended tool life
• 135-degree split-point geometry self-centers on entry without a pilot hole
• Right-hand cutting direction compatible with standard drill press and handheld equipment
• 2-inch overall length with 1-inch flute length in standard jobber series proportions

Compatibility

Designed as a standard jobber-series drill bit for use in any 3-jaw or collet chuck capable of holding a 0.0760-inch shank diameter; compatible with benchtop drill presses, CNC drilling machines, and portable handheld drills configured for small-diameter tooling.

Installation Notes

This drill bit is installed and serviced by machinists, tool-and-die makers, and maintenance technicians. Secure the shank fully in the chuck and verify concentricity before starting the cut. Apply appropriate cutting fluid or coolant when drilling ferrous and high-alloy materials to manage heat at this small diameter. Inspect the cutting edges before each use, as cobalt bits at this diameter are susceptible to chipping if run at incorrect feeds or speeds.