Hertel 42193 Screw Machine Drill Bit 17/64 Cobalt

Product Description

The HERTEL 42193 is a screw machine length cobalt drill bit designed for drilling into tough ferrous metals and hard alloys. At 17/64 inch (0.2656 inches) in diameter, it features a 135-degree split point that reduces walking and allows for faster penetration without a center punch. The M35 cobalt steel construction and oxide straw finish give the bit superior heat resistance compared to standard high-speed steel. At 2.6250 inches overall length, the stub-length body provides added rigidity, making it well suited for production drilling and close-tolerance work on lathes, drill presses, and milling machines.

This bit is intended for professional machinists and maintenance tradespeople working with hardened materials, heat-treatable alloyed steels, stainless steel, and titanium alloys. Its 3xD flute-to-diameter ratio and 1.4375-inch spiral flute length promote efficient chip evacuation in short-hole drilling applications. It is sold individually and fits standard drill chucks accepting fractional 17/64 inch shanks.

Key Features

• M35 cobalt steel construction for heat and wear resistance in hard-metal applications
• 135-degree split point reduces thrust force and eliminates bit walk on hard surfaces
• Oxide straw finish provides additional surface hardness and corrosion resistance
• Stub screw machine length body increases rigidity and reduces deflection
• Regular spiral flute geometry promotes consistent chip clearance in through-hole drilling
• No coolant-through requirement simplifies setup on standard drill press or lathe

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for any standard drill chuck accepting a 17/64 inch fractional shank in screw machine length format.

Installation Notes

Installation and use should be performed by a qualified machinist or maintenance technician familiar with metal-cutting practices. Secure the workpiece firmly before drilling and ensure the chuck is tightened to the bit shank fully to prevent slippage. When drilling stainless steel or titanium alloys, use a cutting fluid appropriate for those materials to extend bit life. Inspect the cutting edges before each use and replace the bit if chipping or heat discoloration beyond the straw finish is observed.