Hertel 66692153 Screw Machine Drill Bit Size 39 Cobalt

Product Description

The HERTEL 66692153 is a screw machine length drill bit designed for high-productivity drilling in metal and hard materials. Built from heavy-duty 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 lowers thrust force, making it well suited for production drilling without a center punch. At 1-13/16 inches overall length, this stub-length design provides rigidity and minimizes deflection. The straight-cylindrical shank seats securely in standard drill chucks. Right-hand cutting with a regular spiral flute provides efficient chip evacuation.

This drill bit is sized at wire gauge 39, equivalent to 0.0995 inch decimal diameter. The short flute length of 13/16 inches and parallel web configuration with web thinning make it appropriate for repetitive, close-tolerance drilling in sheet metal, structural steel, stainless steel, and other ferrous materials. It is commonly used in machine shops, fabrication environments, and maintenance operations where a rigid, short-length bit is required for accurate hole placement in tight setups or drill presses.

Key Features

• Heavy-duty cobalt construction for heat and wear resistance in hard materials
• TiN coating extends cutting life and reduces friction at the cutting edge
• 135-degree split point for self-centering entry and reduced thrust force
• Web-thinned parallel web for lower feed pressure and cleaner hole entry
• Screw machine (stub) length provides maximum rigidity and minimal deflection
• Right-hand spiral flute promotes efficient chip removal during drilling

Compatibility

Designed as a direct-fit screw machine length drill bit for use in standard drill chucks, drill presses, CNC machining centers, and automatic screw machines accepting a 0.0995-inch straight-cylindrical shank.

Installation Notes

Installation and use of this drill bit should be performed by machinists or qualified tradespeople familiar with rotating cutting tools. Ensure the drill chuck is fully tightened and the shank is fully seated before operation. Always wear appropriate eye protection and follow applicable machine guarding requirements. Do not exceed the recommended speed and feed parameters for the work material being drilled.