Hertel C.40N.3651 Screw Machine Drill Bit 1-7/16 in

Product Description

The HERTEL C.40N.3651 is a screw machine length drill bit designed for high-production drilling in metal, wood, and composite materials. Built from high-speed steel with a bright, uncoated finish, this bit measures 1-7/16 inches (1.4375 inches decimal) in diameter and features a 118-degree conventional point angle suited for general-purpose drilling across a wide range of workpiece materials. The shorter-than-jobber body length improves rigidity and reduces deflection, making it well-suited for drill press and CNC lathe applications where close tolerance is required. Machinists, toolroom technicians, and maintenance mechanics rely on this geometry for accurate hole entry and consistent performance in production environments.

This drill bit fits standard general-purpose drilling operations in manufacturing, maintenance, and fabrication settings. The screw machine length profile — shorter overall length compared to jobber-length bits — provides added stiffness when drilling larger-diameter holes through steel plate, cast iron, aluminum, and similar structural materials. With a 4-3/4-inch flute length and 7-3/8-inch overall length, this bit accommodates typical chuck depths on drill presses, knee mills, and turret lathes. It is sold individually and suited for shops requiring a single replacement or low-volume restocking.

Key Features

• 1-7/16 inch (1.4375 inch) diameter for large-hole drilling applications
• 118-degree conventional point angle for general-purpose material entry
• High-speed steel construction provides heat resistance and edge retention
• Bright, uncoated finish — no coating buildup to affect hole tolerance
• Screw machine length body improves rigidity and reduces chatter versus jobber-length bits
• Right-hand cutting direction, compatible with standard drill press and CNC spindle rotation

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with drill presses, knee mills, turret lathes, and CNC machining centers equipped with chucks or tool holders sized for 1-7/16 inch shank diameter tooling. Suitable for the Drill Bit Size Range of 0.6000 inches and above per the specified grade classification.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the spindle is fully stopped and the machine is locked out before changing tooling. Secure the bit firmly in a properly sized chuck or collet to prevent slippage under the torque loads generated by a 1-7/16 inch cutting diameter. Verify workpiece is clamped securely and use appropriate cutting fluid for the material being drilled to extend tool life and maintain hole quality.