Hertel 16691933 Screw Machine Drill Bit 7/64 Inch Carbide

Product Description

The HERTEL 16691933 is a screw machine length drill bit designed for high-performance drilling in demanding materials. Built from solid carbide with a titanium nitride (TiN) coating, it delivers extended tool life and reduced friction in tough workpiece materials. The bit measures 1-13/16 inches overall length with a 13/16-inch flute length and a 7/64-inch (0.1094 inch) diameter. The 135-degree split point and web-thinned geometry reduce thrust force and improve centering without a pilot hole. With a maximum drilling depth of 1.77 inches, this bit suits precision hole-making in short-reach applications where rigidity and accuracy are critical.

This drill bit is engineered for use in cast iron, nickel alloys, stainless steel, titanium alloys, and tool steel — materials that demand carbide construction and a geometry that resists work hardening and galling. The screw machine length (stub length) profile provides added rigidity compared to jobber-length bits, making it well-suited for CNC machining centers, turret lathes, drill presses, and manual screw machines where short reach and minimal deflection matter. Machinists, tool and die makers, and production shop technicians are the primary users of this type of bit.

Key Features

• Solid carbide construction rated to material grade C2 for hardness and wear resistance in ferrous and exotic alloys
• TiN (titanium nitride) coating reduces friction, improves surface hardness, and extends cutting life
• 135-degree split point with web thinning reduces entry thrust and improves self-centering
• Slow spiral flute geometry suited to hard, short-chip materials such as cast iron and stainless steel
• Straight cylindrical shank compatible with standard drill chucks and collet holders
• Diameter tolerance of +0.0000 to -0.0005 inches ensures close-tolerance hole production

Compatibility

Part of the HERTEL HSSC135-TN-SS series. Designed for use with standard straight-shank drill chucks and collet systems accepting a 7/64-inch shank. Intended for drilling cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel workpieces.

Installation Notes

Install into a properly sized collet or drill chuck and verify runout before commencing drilling. Power down and de-energize the machine spindle before changing tooling. Use appropriate cutting fluid or coolant compatible with the workpiece material even though this bit does not feature through-coolant capability. Follow the machine manufacturer and shop safety guidelines for RPM and feed rate selection when working with carbide tooling in hard or exotic alloys.