Cleveland C14677 Letter O Cobalt Screw Machine Drill Bit

Product Description

The CLEVELAND C14677 is a cobalt screw machine length drill bit sized at Letter O (0.3160 inches) with a 135-degree split point and web-thinned geometry. Built from M42 cobalt high-speed steel, it is designed for heavy-duty drilling in tough materials including alloy steel and aluminum. The shortened screw machine length body reduces deflection in close-quarters drilling and rigid setups. With a straight cylindrical shank at 0.3160 inches in diameter and an overall length of 2-15/16 inches, this bit fits standard drill chucks and CNC tool holders. Right-hand cut with a regular spiral and parallel web configuration, it delivers clean entry and efficient chip evacuation in production environments.

This drill bit is suited for metal fabrication shops, machine shops, and production drilling operations where rigidity and hole accuracy are priorities. The screw machine length format is commonly selected for drill press, turret lathe, and CNC machining center applications where stub-length tools reduce runout and improve positional accuracy. The 135-degree split point reduces thrust and self-centers on flat or curved surfaces without a center punch in many applications. Typical users include machinists, tool-and-die technicians, and maintenance professionals working with ferrous and non-ferrous metals.

Key Features

• Letter O size: 0.3160 inches diameter with tolerance of +0.0000 to -0.0010 inches
• M42 cobalt construction rated for heavy-duty drilling in alloy steel and aluminum
• 135-degree split point with web thinning for reduced thrust and self-centering entry
• Screw machine (stub) length at 2-15/16 inches OAL for improved rigidity and reduced deflection
• Straight cylindrical shank at 0.3160 inches diameter fits standard chucks and collets
• Right-hand cut with regular spiral and 2-flute configuration for efficient chip removal

Compatibility

Designed as an OEM-style screw machine length drill bit compatible with standard drill chucks, collets, and CNC tool holders accepting a 0.3160-inch straight cylindrical shank.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance technicians familiar with cutting tool safety practices. Secure the shank fully in the chuck or collet before operation and verify runout before production drilling. Always power down and lock out the machine before changing tooling. Follow applicable shop safety standards and manufacturer recommendations for speeds and feeds based on workpiece material.