Hertel 74148842 Screw Machine Drill Bit 3/16 in Carbide

Product Description

The HERTEL 74148842 is a screw machine length drill bit designed for high-performance drilling in hard and abrasive materials. Built from solid carbide grade C2, this 3/16 inch (0.1875 inch) diameter bit features a 135-degree split point for fast, self-centering starts with minimal walking. The slow spiral flute geometry controls chip evacuation in tough materials, while the web-thinned, parallel web construction reduces thrust and extends tool life. Weighing 0.02 pounds, it is sold as a single unit and is suited for production and maintenance drilling where precision and bit longevity are priorities.

This drill bit is intended for drilling cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel. Screw machine length bits are shorter and more rigid than jobber-length bits, making them a preferred choice when drill press or CNC spindle rigidity is needed and breakout control matters. The straight cylindrical shank fits standard drill chucks and collets without modification, and the bright uncoated finish keeps tolerances tight right out of the package.

Key Features

• Solid carbide C2 grade construction for durability in hard and abrasive workpiece materials
• 135-degree split point with web thinning reduces thrust and eliminates center punch requirement
• Slow spiral flute promotes controlled chip flow in stringy and hard-to-machine alloys
• Screw machine (stub) length body provides added rigidity compared to jobber-length bits
• Right-hand cut with spiral flutes and straight cylindrical shank for universal chuck compatibility
• Diameter tolerance held to +0.0000 to -0.0005 inches for close-tolerance hole applications

Compatibility

Designed as a direct-fit replacement or production tooling option for any application requiring a 3/16 inch screw machine length carbide drill bit with a straight cylindrical shank in the 0.1500 to 0.2000 inch drill bit size range.

Installation Notes

Installation and use should be performed by machinists, toolroom technicians, or qualified maintenance personnel familiar with drill press, CNC machining center, or hand-drill operation. Secure the shank firmly in the chuck or collet before use and verify runout before production drilling. Always match spindle speed and feed rate to the workpiece material; carbide tooling is brittle and susceptible to chipping from excessive vibration or interrupted cuts. Eye protection and appropriate machine guarding are required during operation.