Cleveland C15089 43/64 Inch Cobalt Screw Machine Drill Bit

Product Description

The CLEVELAND C15089 is a screw machine length drill bit designed for demanding metal-cutting applications. Built from M42 cobalt high-speed steel, it delivers heat resistance and edge retention when drilling through tough workpiece materials. The bit features a 135-degree split point that reduces walking on entry and decreases thrust force required at the spindle. A parabolic flute geometry promotes efficient chip evacuation, reducing clogging during deep hole work. At 4.625 inches overall length with a straight-cylindrical shank, it mounts directly into standard drill chucks and machine tool spindles without adapters. Licensed machinists, toolroom operators, and maintenance mechanics reach for this style of bit when production speed and hole quality both matter.

This drill bit suits machine shop production environments, maintenance and repair operations, and fabrication settings where tight hole tolerances are required. Primary workpiece materials include alloy steel and aluminum. The screw machine length — shorter than jobber length — provides increased rigidity and reduces deflection when used in drill presses, CNC machining centers, and turret lathes. The straight-cylindrical shank diameter matches the bit diameter at 0.6719 inches, making it compatible with standard three-jaw chucks sized for that bore range.

Key Features

• M42 cobalt steel construction for elevated heat resistance and extended tool life in alloy and aluminum drilling
• 135-degree split point reduces center punch requirement and minimizes drill walk on entry
• Parabolic flute geometry with web thinning promotes fast chip evacuation and reduces feed force
• Parallel web configuration and web-thinned design maintain cutting efficiency as the bit is resharpened
• Screw machine length body provides added rigidity over jobber-length bits, reducing deflection in production setups
• Manufactured to ASME B94.11M and ANSI specification designation with a diameter tolerance of plus 0.0000 to minus 0.0012 inches

Compatibility

Designed for use with standard drill chucks and machine tool spindles accepting a straight-cylindrical shank of 0.6719 inches. Rated for drilling alloy steel and aluminum workpieces. Part of the CLEVELAND Series 2175A screw machine length cobalt drill line.

Installation Notes

Install and remove this bit only with the spindle fully stopped and the machine isolated from power. Secure the straight shank firmly in the chuck to the full depth of the chuck jaws to prevent slippage under cutting load. When drilling alloy steel, use appropriate cutting fluid to manage heat buildup and extend tool life. Verify spindle speed and feed rate against published cutting data for the workpiece material before beginning a production run.