Cleveland C14687 Letter R Cobalt Screw Machine Drill Bit

Product Description

The CLEVELAND C14687 is a cobalt screw machine length drill bit sized to Letter R, equal to 0.3390 inches in diameter. The bit features a 135-degree split point with web thinning for fast penetration and reduced walking on entry. Built from M42 cobalt high-speed steel, it carries a heavy-duty grade rating suited for demanding drilling applications. The overall length is 3.0 inches, with a straight-cylindrical shank of 0.3390 inches in diameter and a shank length of 1.3125 inches. The flute length measures 1.6875 inches. This bit is installed by machinists, maintenance technicians, and tool-and-die professionals working with drill presses, lathes, or CNC equipment.

The C14687 is designed for drilling into alloy steel and aluminum in production and job-shop environments where a shorter, stiffer screw machine length bit is preferred over jobber-length tooling. The reduced overall length improves rigidity and minimizes deflection when drilling in drill presses or turret lathes. Its two-spiral flutes with a regular helix promote efficient chip evacuation. Right-hand cut geometry is standard for conventional clockwise spindle rotation. Series 2133 construction conforms to ASME B94.11M and is dual-designated ANSI and DIN 1897.

Key Features

• Letter R size — 0.3390 inch diameter with a tolerance of +0.0000 to -0.0010 inches
• M42 cobalt construction rated heavy duty for alloy steel and aluminum
• 135-degree split point with web thinning for self-centering entry
• Screw machine (stub) length at 3.0 inches overall for increased rigidity
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Conforms to ASME B94.11M, ANSI, and DIN 1897 standards

Compatibility

Designed as a screw machine length drill bit for use in drill presses, turret lathes, and CNC equipment with standard chucks or collets accepting a 0.3390-inch straight shank. Primary workpiece materials per manufacturer specification are alloy steel and aluminum.

Installation Notes

Install and remove drill bits only with the machine fully powered down and the spindle at a complete stop. Secure the shank fully in the chuck or collet and verify concentricity before running. Use appropriate cutting fluid for the workpiece material to extend tool life and manage heat. Inspect the cutting edges for wear or chipping before each use and replace the bit if the point geometry is compromised.