Hertel C.40N.3493 Screw Machine Drill Bit 1-3/8 in Hss

Product Description

The HERTEL C.40N.3493 is a screw machine length drill bit designed for high-volume drilling in metal, wood, and general-purpose materials. Built from high-speed steel with a bright uncoated finish, it features a 118-degree split-point angle suited for accurate starting on flat and curved surfaces. At 1.375 inches in diameter with an overall length of 7.125 inches, this stub-length bit fits standard drill presses, CNC machines, and heavy-duty hand drills. The shortened flute-to-body ratio provides added rigidity compared to jobber-length bits, reducing deflection during deep passes. Machinists, tool-and-die workers, and maintenance trades use this bit for production drilling where hole-to-hole accuracy matters.

This bit is appropriate for general-purpose drilling applications in industrial, manufacturing, and maintenance environments. The screw machine length profile makes it well-suited for drill press work, turret lathes, and CNC setups where limited spindle clearance is a factor. The right-hand cutting direction is compatible with standard clockwise spindle rotation. Its general-purpose grade makes it a reliable choice for ferrous metals, plastics, and wood in production and repair settings.

Key Features

• 1.375 inch diameter for large-bore drilling applications
• 118-degree point angle for general-purpose material entry
• High-speed steel construction provides heat and wear resistance
• Bright uncoated finish suitable for use with cutting fluids
• Screw machine length body adds rigidity and reduces bit deflection
• Right-hand cut compatible with standard clockwise spindle rotation

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with drill presses, CNC machining centers, and turret lathes accepting large-diameter straight-shank tooling.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals familiar with large-diameter drilling operations. Ensure the workpiece is properly clamped and the spindle is stopped completely before changing or inspecting the bit. Use appropriate cutting fluid for metal applications to extend tool life and maintain hole tolerance. Follow applicable shop safety standards and machine manufacturer guidelines for drill speed and feed rate selection.