Hertel C.402.0990 Jobber Drill Bit 9.90 Mm Hss

Product Description

The HERTEL C.402.0990 is a high speed steel jobber-length drill bit designed for general-purpose drilling in metal, wood, and plastic. It features a 118-degree standard point angle and a spiral flute geometry that promotes efficient chip evacuation during through-hole and blind-hole operations. The oxide coating provides a degree of surface hardness and corrosion resistance suited to everyday shop use. At 130 mm overall length with a 95 mm flute length, this bit fits standard drill chucks and CNC machine spindles alike. It is sold individually and is appropriate for machinists, maintenance technicians, and fabricators working across a range of materials.

This jobber drill is intended for general-purpose applications in light to medium manufacturing, maintenance and repair operations, and fabrication shops. The straight-cylindrical shank seats in conventional three-jaw chucks on benchtop drill presses, radial arm drills, and handheld power drills. The 9.90 mm diameter falls within the 9.00 to 10.00 mm size range, making it a common selection for metric hole patterns requiring a nominal 10 mm clearance with slight undersize tolerance. Right-hand cutting direction is standard for conventional drill press and CNC machining center use.

Key Features

• 9.90 mm diameter (0.3898 inch decimal equivalent) for metric and inch-conversion hole patterns
• 118-degree standard point angle for general-purpose entry into a wide range of materials
• High speed steel construction for durability across metal, plastic, and wood substrates
• Oxide coating adds surface protection and reduces friction during drilling
• Two-flute spiral design promotes chip clearance and reduces heat buildup
• Straight-cylindrical shank compatible with standard three-jaw drill chucks

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard three-jaw chuck or collet system accepting a straight-cylindrical shank in the 9.00 to 10.00 mm diameter range.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard drill press, hand drill, or CNC spindle. Secure the shank fully in the chuck before operation and verify runout is within acceptable limits for the application. Ensure the workpiece is clamped or fixtured before drilling to prevent movement. Follow applicable shop safety practices including eye protection and chip guarding when operating drilling equipment.