Cleveland C15151 Screw Machine Drill Bit Letter V Cobalt

Product Description

The CLEVELAND C15151 is a screw machine length drill bit sized at letter V (0.3770 inches) and designed for high-speed drilling in tough materials. Built from cobalt M42 high-speed steel, it handles the heat and wear demands of drilling alloy steels and aluminum without losing edge integrity. The 135-degree split point reduces thrust and self-centers on contact, eliminating the need for a center punch in most applications. Parabolic flutes evacuate chips efficiently, and the web-thinned, parallel-web configuration keeps cutting resistance low. Overall length is 3.25 inches, making it compact and rigid for short-hole work in production or field environments.

This bit fits production drilling, maintenance, and fabrication applications where a stub-length drill is preferred for rigidity and accuracy. Screw machine length drills are standard in CNC drill presses, turret lathes, and bench drill setups where reduced overhang minimizes deflection. Primary workpiece materials include alloy steel and aluminum, making this a solid choice for mechanical contractors, millwrights, and machinists handling structural or component fabrication tasks. Right-hand cut with a straight-cylindrical shank, it seats directly in standard drill chucks and collet holders without adapters.

Key Features

• Cobalt M42 construction for heat resistance and extended tool life in alloy and aluminum drilling
• 135-degree split point self-centers and reduces entry thrust
• Parabolic flutes with web thinning for fast chip evacuation and low cutting resistance
• Screw machine (stub) length provides maximum rigidity and minimal deflection
• Straight-cylindrical shank fits standard drill chucks and collet holders
• Meets ASME B94.11M standards with ANSI specification designation

Compatibility

Designed as an OEM-style replacement and standard-production screw machine length drill bit suitable for use in drill presses, CNC machining centers, turret lathes, and hand-held drill setups accepting a 0.3770-inch straight-cylindrical shank.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals familiar with cutting tool safety. Secure the shank fully in the chuck or collet and verify runout before engaging the workpiece. Always use appropriate cutting fluid when drilling alloy steel to reduce heat buildup and extend tool life. Inspect the cutting edges before each use and do not operate a chipped or dull bit, as this increases the risk of bit failure and workpiece damage.