Hertel 42244 Screw Machine Drill Bit 0.625 in Cobalt

Product Description

The HERTEL 42244 is a screw machine length cobalt drill bit designed for drilling into hard and demanding workpiece materials. Built from M35 cobalt high-speed steel, it measures 0.625 inches (5/8 inch) in diameter with an overall length of 4.4375 inches and a flute length of 2.9375 inches. The 135-degree split point reduces thrust and self-centers on contact, eliminating the need for a center punch on most surfaces. The oxide straw finish provides mild lubricity and heat resistance. This bit is intended for use by machinists, tool and die workers, and maintenance professionals working with tough alloys.

The HERTEL 42244 is suited for production and maintenance drilling applications where standard high-speed steel bits lose their edge too quickly. Its primary workpiece materials include hardened materials, heat-treatable alloyed steels, stainless steel, and titanium alloy. The shorter screw machine length body provides added rigidity compared to jobber-length bits, making it well suited for drill press, turret lathe, and CNC machining center use where chatter and deflection need to be minimized.

Key Features

• M35 cobalt steel construction handles hardened materials, stainless steel, and titanium alloy
• 135-degree split point self-centers and reduces feed pressure on entry
• Screw machine length body (4.4375 inches overall) provides rigidity and reduces deflection
• Spiral flute with 3xD flute-to-diameter ratio promotes chip evacuation
• Oxide straw finish adds surface hardness and mild lubricity
• No coolant-through required, suitable for standard machine tool setups

Compatibility

Designed as a direct-fit replacement or upgrade for standard 5/8 inch screw machine length drill bits used in drill presses, lathes, and CNC machining centers handling hardened and alloyed steels.

Installation Notes

Installation of this drill bit is performed by machinists and tool operators using appropriate drill chucks or collet holders rated for the 0.625 inch shank diameter. Secure the bit fully in the chuck and verify runout before cutting. Always power down and lock out the machine before changing tooling. Use appropriate cutting fluid or coolant when drilling stainless steel or titanium alloy to extend tool life and manage heat buildup.