Hertel C.402.0790 Jobber Drill Bit 7.90 Mm Hss

Product Description

The HERTEL C.402.0790 is a high speed steel jobber-length drill bit sized at 7.90 mm (0.3110 inches) in diameter. It features a 118-degree standard point angle and a spiral flute configuration with right-hand cutting direction. The bit carries an oxide coating that provides basic lubricity and surface protection during drilling operations. With an overall length of 114 mm and a flute length of 81 mm, this is a general-purpose drill suited for machinists, maintenance mechanics, and metalworking trades who need a reliable straight-shank bit for everyday material removal tasks.

This jobber drill is intended for general-purpose drilling applications in metalworking, maintenance, and fabrication environments. The straight-cylindrical shank fits standard three-jaw drill chucks on benchtop drill presses, hand drills, and milling machine setups. Its 7.90 mm diameter falls within the 7.00 mm to 8.00 mm size range, making it appropriate for hole-making operations where metric sizing is specified. No coolant-through capability is present, so it is best suited for light-to-moderate duty applications with external lubrication or dry cutting where the material allows.

Key Features

• 7.90 mm (0.3110 inch) diameter for precise metric-spec hole sizing
• 118-degree standard point angle for general-purpose drilling in common metals and plastics
• High speed steel construction provides durability across a range of workpiece materials
• Oxide coating offers surface lubricity and basic corrosion resistance
• Two-flute spiral design promotes chip evacuation during drilling
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a general-purpose jobber drill compatible with any standard drill chuck accepting straight-cylindrical shanks in the 7.00 mm to 8.00 mm size range.

Installation Notes

This drill bit is installed by a machinist or qualified maintenance mechanic using a standard keyed or keyless three-jaw chuck. Ensure the machine is fully powered down and the spindle is locked before changing bits. Apply appropriate cutting fluid or lubrication for the workpiece material when drilling metals to extend tool life and maintain hole quality. Inspect the cutting edges for wear or chipping before each use and replace the bit if the point shows signs of dulling.