Cleveland C14657 Cobalt Screw Machine Drill Bit Letter I

Product Description

The CLEVELAND C14657 is a cobalt screw machine length drill bit sized at letter I (0.2720 inches), designed for high-performance drilling in demanding metalworking applications. Built to Series 2133 standards and conforming to ASME B94.11M and DIN 1897, this heavy-duty bit features a 135-degree split point for fast starts and reduced walking on hard surfaces. The web-thinned, parallel web construction lowers thrust requirements and improves chip evacuation. At 2-11/16 inches overall length with a 1-1/2-inch flute length, the compact screw machine profile suits close-quarters and production drilling. Two right-hand spiral flutes with a coated finish extend tool life in tough materials. Machinists, maintenance technicians, and tool-and-die professionals are the primary users.

The C14657 is rated for primary use in alloy steel and aluminum workpieces, making it well suited to production environments, machine shops, and MRO operations where consistent hole quality at letter-size diameters is required. The screw machine length geometry fits standard drill chucks and CNC turret setups where stub-length rigidity is preferred over jobber-length reach. The straight-cylindrical shank (0.2720-inch diameter) seats securely in keyless or keyed chucks without slippage under moderate feed loads.

Key Features

• Letter I size (0.2720 inches) with diameter tolerance of +0.0000 to -0.0010 inches for consistent, on-spec holes
• M42 cobalt construction provides heat and wear resistance in alloy steel and aluminum
• 135-degree split point reduces thrust and eliminates the need for a center punch on most metals
• Web-thinned, parallel web design lowers cutting resistance and improves chip flow
• Screw machine (stub) length at 2-11/16 inches OAL delivers added rigidity versus jobber-length bits
• Right-hand cut with regular spiral and coated finish for extended tool life in production use

Compatibility

Designed as an OEM-style screw machine drill bit compatible with standard straight-cylindrical chuck systems; primary workpiece materials listed by the manufacturer are alloy steel and aluminum.

Installation Notes

Installation of this bit should be performed by a qualified machinist or maintenance technician familiar with drill press, lathe, or CNC turret operations. Ensure the machine spindle is fully stopped and locked out before changing bits. Seat the straight-cylindrical shank fully into the chuck and tighten to the machine manufacturer's specified torque or clamping method. Use appropriate cutting fluid or coolant for the workpiece material to maintain bit temperature and extend service life; note this bit does not support through-coolant delivery.