Hertel 66691296 3/16 Inch Cobalt Screw Machine Drill Bit

Product Description

The HERTEL 66691296 is a screw machine length twist drill bit designed for high-production drilling in metal and hard materials. Built from cobalt steel with a titanium nitride (TiN) coating, it delivers extended tool life and heat resistance in demanding applications. The 135-degree split point reduces walking on entry and allows drilling without a center punch in most setups. At 2-3/16 inches overall length with a 1-1/8-inch flute length, the stubby screw machine profile provides added rigidity over jobber-length bits, reducing deflection in short-stroke and turret applications. Right-hand cutting with a regular spiral flute pattern. Installed by machinists, tool-and-die shops, and trade professionals working with CNC equipment, drill presses, and handheld power tools.

This bit is suited for drilling ferrous metals, stainless steel, and other hard materials where standard high-speed steel bits wear prematurely. The screw machine length format makes it a preferred choice for drill press work, turret lathes, and screw machine operations where a shorter, stiffer bit reduces chatter and improves hole accuracy. The straight cylindrical shank fits standard chucks without modification. The TiN coating reduces friction and extends cutting life compared to uncoated cobalt bits in repetitive production runs.

Key Features

• Cobalt steel construction for heat resistance and durability in hard and abrasive materials
• TiN coating reduces friction and extends tool life in production drilling
• 135-degree split point for reduced entry force and minimal walking without a center punch
• Screw machine length profile increases rigidity and reduces deflection versus jobber-length bits
• Web-thinned parallel web configuration for improved chip evacuation
• Right-hand spiral flute, straight cylindrical shank for standard chuck compatibility

Compatibility

Designed as a direct-fit screw machine length drill bit for use in standard drill chucks, drill presses, turret lathes, CNC drilling centers, and screw machines accepting a 3/16-inch straight cylindrical shank.

Installation Notes

Installation and use should follow standard machining safety practices. Secure the bit firmly in the chuck and verify runout before drilling. Always power down and lock out the machine before changing tooling. Use appropriate cutting fluid or coolant for the material being drilled to maximize tool life, even though this bit does not support coolant-through delivery.