Hertel 66691874 Cobalt Screw Machine Drill Bit Size 11

Product Description

The HERTEL 66691874 is a cobalt screw machine length drill bit designed for high-performance drilling in tough materials. Built to a 135-degree split point geometry with web thinning, it starts on contact without a center punch and reduces thrust in hard metals. The TiN coating extends cutting life by increasing surface hardness and reducing friction. At 2.25 inches overall length and a 0.1910-inch diameter, this short-flute stub design fits tight clearance applications where a jobber-length bit would not. It is used by machinists, pipefitters, and maintenance technicians working with stainless steel, alloy steel, and other hard ferrous materials.

Screw machine length drill bits are the standard choice for CNC lathes, drill presses, and turret setups where rigidity and minimal overhang matter. The HERTEL 66691874 is sized as wire gauge Number 11, equivalent to 0.1910 inches, placing it in the 0.1500 to 0.2000 inch range. The straight cylindrical shank seats directly into standard drill chucks and collets without adapters. It is suited for production drilling, tap prep, and hole sizing in industrial and shop environments where consistent diameter and tool life are priorities.

Key Features

• 135-degree split point with web thinning for self-starting cuts and reduced thrust
• Cobalt construction handles elevated heat in stainless, alloy steel, and hard ferrous metals
• TiN coating increases surface hardness and extends tool life
• Screw machine length at 2.25 inches OAL provides rigidity in tight clearance setups
• Straight cylindrical shank at 0.1910 inches fits standard chucks and collets
• 2-flute regular spiral geometry with 1.1875-inch flute length for efficient chip evacuation

Compatibility

Designed as an OEM-style replacement or direct substitute screw machine drill bit for use in standard drill chucks and collets accepting a 0.1910-inch straight shank, across CNC lathes, drill presses, and turret applications.

Installation Notes

Install into a properly sized drill chuck or collet and confirm the shank is fully seated and secured before operation. Ensure the drill press or CNC spindle is powered down and locked out before changing tooling. Use appropriate cutting fluid or coolant when drilling hard metals to manage heat, noting this bit does not support coolant-through delivery. Follow shop safety standards and applicable OSHA machine guarding requirements during use.