Hertel 66691924 Screw Machine Drill Bit Size 16 Cobalt

Product Description

The HERTEL 66691924 is a screw machine length drill bit built for heavy-duty metal cutting in production and maintenance environments. Manufactured from cobalt steel and finished with a titanium nitride (TiN) coating, this bit handles harder workpiece materials and elevated cutting temperatures better than standard high-speed steel. It carries a wire gauge size 16 designation, which corresponds to a decimal diameter of 0.1770 inches. The 135-degree split point and web-thinned geometry reduce the thrust force needed to start the cut, allowing the bit to self-center without a pilot hole in most applications. Overall length is 2-3/16 inches with a 1-1/8-inch flute length.

This drill bit is suited for general metal fabrication, sheet metal work, and screw machine operations where a shorter-than-jobber-length tool improves rigidity and reduces deflection. The straight cylindrical shank fits standard three-jaw drill chucks on drill presses, CNC machining centers, and hand-held power drills. It is appropriate for machinists, maintenance technicians, and tool and die professionals working with steel, stainless, cast iron, and other ferrous or hard alloy materials. The regular spiral flute provides efficient chip evacuation in through-hole and blind-hole drilling.

Key Features

• Cobalt construction handles high heat and extended run times on hard materials
• TiN coating reduces friction and extends cutting edge life
• 135-degree split point starts on contact and minimizes walking
• Web-thinned, parallel web design lowers required feed force
• Screw machine length body improves rigidity compared to jobber-length bits
• Right-hand cutting with regular spiral flute for clean chip removal

Compatibility

Designed as an OEM-style replacement or direct drop-in drill bit for any standard three-jaw chuck accepting a 0.1770-inch straight cylindrical shank, appropriate for drill press, benchtop, and handheld power tool applications within the 0.1500 to 0.2000-inch drill bit size range.

Installation Notes

Installation is performed by machinists or maintenance technicians familiar with rotating cutting tools. Secure the shank fully in the chuck before operation and confirm the bit runs true before engaging the workpiece. Always wear appropriate eye protection and secure the workpiece to prevent rotation. Coolant-through is not supported on this bit, so apply cutting fluid manually at the drill point when working hard alloys to manage heat buildup.