Hertel C.40N.3334 Screw Machine Drill Bit 1-5/16 in Hss

Product Description

The HERTEL C.40N.3334 is a screw machine length drill bit designed for high-production drilling in metal fabrication, machining, and general industrial applications. It measures 1-5/16 inches (1.3125 inches decimal) in diameter and features a 118-degree conventional split point for reliable self-centering on flat and curved stock. Constructed from high-speed steel (HSS) with a bright, uncoated finish, this bit suits general-purpose drilling in steel, aluminum, cast iron, and similar materials. The screw machine length body — shorter than jobber length — provides added rigidity and reduced deflection, making it a practical choice for drill press and CNC turret work where stub-length stiffness is required.

This drill bit is intended for use in drill presses, turret lathes, screw machines, and similar production machine tools where a large-diameter, rigid cutting tool is needed. The 1-5/16-inch diameter places it in the heavy-duty range, commonly used by machinists, tool-and-die workers, and industrial maintenance technicians for enlarging existing holes or drilling through structural stock. It is sold individually and fits standard heavy-duty drill chucks and morse taper adapters that accommodate the 1.3125-inch shank diameter.

Key Features

• 1-5/16 inch (1.3125 inch decimal) diameter for heavy-duty material removal
• 118-degree conventional point angle — standard geometry for general-purpose drilling in ferrous and non-ferrous metals
• High-speed steel construction provides heat and wear resistance at sustained cutting speeds
• Bright, uncoated finish allows easy visual inspection for wear and regrinding
• Screw machine (stub) length — 7 inches overall with a 4-3/8 inch flute length — delivers enhanced rigidity over jobber-length bits
• Right-hand cutting direction, compatible with standard drill press and machine tool spindles

Compatibility

Designed as a general-purpose screw machine length drill bit rated for applications in the 0.6000-inch-and-above diameter range per the listed drill bit size range classification. Compatible with heavy-duty drill chucks and machine tool holders rated for 1-5/16 inch shank diameters.

Installation Notes

Installation and use of large-diameter drill bits of this type is typically performed by machinists or industrial maintenance technicians operating drill presses, lathes, or CNC turret machines. Ensure the machine spindle and chuck are rated for the 1-5/16 inch diameter before mounting. Power down and lock out the machine before securing or removing the bit from the chuck or adapter. Use appropriate cutting fluid for the workpiece material to manage heat buildup at the cutting edge during prolonged drilling cycles.