Hertel C.402.1240 Jobber Drill Bit 12.40 Mm Hss

Product Description

The HERTEL C.402.1240 is a high speed steel jobber-length drill bit designed for general-purpose drilling in metal, wood, and plastics. It features a 118-degree standard point angle for reliable self-centering on flat and curved surfaces, and an oxide coating that reduces friction and heat buildup during cutting. At 12.40 mm (0.4882 inches) in diameter, the bit fits standard drill chucks and magnetic drill presses. With a straight-cylindrical shank and right-hand spiral flute geometry, it is suited for use in both handheld and bench-mounted drilling equipment. Machinists, maintenance technicians, and fabricators commonly use this bit for production and repair applications.

This drill bit is intended for general-purpose drilling across a range of materials encountered in metalworking, fabrication, and maintenance trades. Its 12.40 mm diameter falls within the 10.00 mm to 12.50 mm size range, making it a practical choice when fractional inch or metric hole sizing is required in this mid-range diameter class. The 149 mm overall length provides adequate depth capacity for through-holes in standard stock thicknesses. No coolant-through capability is present, so external cutting fluid application is recommended when drilling hardened or stainless materials.

Key Features

• 12.40 mm diameter (0.4882 inches) for metric and near-fractional hole sizing
• 118-degree standard point angle for general-purpose self-centering entry
• High speed steel construction with oxide coating to reduce friction and extend tool life
• Right-hand cutting direction with spiral flute for efficient chip evacuation
• Straight-cylindrical shank fits standard 3-jaw and keyless drill chucks
• 149 mm overall length with 111 mm flute length for adequate drilling depth

Compatibility

Designed as a general-purpose jobber drill bit compatible with any drill press, handheld drill, or CNC drilling machine accepting a straight-cylindrical shank in the 12.40 mm diameter range.

Installation Notes

Installation is performed by machinists or maintenance trades using a standard drill chuck or collet system. Ensure the chuck is fully tightened and the workpiece is securely clamped before beginning any drilling operation. Apply cutting fluid when drilling ferrous metals to manage heat and extend bit life. Inspect the cutting edges for wear or chipping before each use and replace the bit if edge integrity is compromised.