Hertel 42195 Cobalt Screw Machine Drill Bit 9/32 in

Product Description

The HERTEL 42195 is a cobalt screw machine length drill bit designed for high-performance drilling in tough materials. Built from M35 cobalt steel with an oxide straw finish, this bit delivers heat resistance and edge retention that standard high-speed steel cannot match. The 135-degree split point reduces walking and cutting pressure on entry, making it well-suited for hardened materials, stainless steel, heat-treatable alloyed steels, and titanium alloys. At 9/32 inch (0.2812 inch) in diameter with a 2.6875-inch overall length and a 1.5-inch spiral flute, it fits standard drill chucks and is sized for close-tolerance screw machine work.

This bit is intended for use in drill presses, CNC drilling centers, turret lathes, and screw machines where short flute length and rigid construction are required. It is especially useful in production environments where consistent hole quality in alloy steels and stainless steel is critical. The 3xD flute-to-diameter ratio and spiral flute geometry promote chip evacuation in interrupted cuts and deep-hole sequences typical of metal fabrication and machining shops.

Key Features

• M35 cobalt construction for improved heat resistance and tool life in hard alloys
• 135-degree split point reduces thrust and eliminates center-punching on most metals
• Oxide straw finish reduces friction and improves chip flow
• Screw machine (stub) length provides added rigidity over jobber-length bits
• Spiral flute geometry supports efficient chip evacuation
• No coolant-through design — suitable for standard drilling setups with external coolant or cutting fluid

Compatibility

Designed for drilling hardened materials, heat-treatable alloyed steels, stainless steel, and titanium alloy. Fits standard drill chucks accepting 9/32 inch shanks and is compatible with screw machines, drill presses, and CNC drilling equipment in the 0.2500 to 0.3000 inch drill bit size range.

Installation Notes

Installation and use should be performed by qualified machinists or tool operators familiar with metal-cutting applications. Secure the bit firmly in the chuck and verify runout before drilling. Apply appropriate cutting fluid or coolant for the workpiece material to extend tool life and maintain hole quality. Do not exceed the recommended feed rate or spindle speed for the material being drilled.