Hertel 74130220 Screw Machine Drill Bit 11/64 in Cobalt

Product Description

The HERTEL 74130220 is a screw machine length (stub) drill bit designed for high-speed, close-tolerance drilling in metal fabrication, machining, and maintenance applications. Built from cobalt high-speed steel (HSCO), this bit handles harder workpiece materials and elevated cutting temperatures that standard HSS tooling cannot sustain. The 135-degree split point starts on contact without a center punch and reduces walking on flat or curved surfaces. At 2.125 inches overall length, the stub-length body provides extra rigidity, reducing deflection during drilling. It is sold individually and suited for use in drill presses, CNC machining centers, hand drills, and screw machine setups.

The 74130220 is a general-purpose stub drill intended for production and maintenance work in metal, stainless, cast iron, and other hard-to-machine materials. The short overall length makes it well suited for tight-clearance work where a jobber-length bit would flex or chatter. Machinists, toolroom technicians, and maintenance mechanics working in industrial, HVAC equipment manufacturing, and mechanical contracting environments will find it a reliable fit for repetitive hole-making tasks.

Key Features

• Cobalt (HSCO) construction withstands higher cutting temperatures than standard M2 HSS bits
• 135-degree split point self-centers on contact, eliminating the need for a center punch
• Web-thinned parallel web reduces thrust force and improves chip evacuation
• Regular spiral fluting with 2 flutes provides reliable chip clearance in through-hole applications
• Straight cylindrical shank fits standard drill chucks without adapters
• Stub (screw machine) length at 2.125 inches overall provides enhanced rigidity and reduced deflection

Compatibility

Designed as an OEM-style replacement and standard tooling selection for screw machine and drill press applications requiring an 11/64-inch (0.1719 inch) diameter stub-length cobalt drill bit with a straight shank.

Installation Notes

Installation is performed by machinist or maintenance personnel. Secure the straight shank firmly in the drill chuck and verify concentricity before cutting. Always power down and lock out the machine before changing tooling. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, even though this bit does not support through-tool coolant delivery.