Cleveland C14212 Cobalt Screw Machine Drill Bit Letter E

Product Description

The CLEVELAND C14212 is a cobalt screw machine length drill bit sized at letter E (0.25 inches decimal), built for heavy-duty drilling in tough materials. The 135-degree split point starts cleanly without a center punch and reduces walking on hard surfaces. A parabolic flute geometry improves chip evacuation, making this bit well suited for deep-hole applications where chip buildup causes heat and tool failure. The web-thinned parallel web configuration reduces thrust requirements at the cutting edge. Overall length is 2.5 inches with a 1.375-inch flute length, keeping the bit rigid and reducing deflection in short-reach screw machine setups. Right-hand cut with a straight cylindrical shank sized at 0.25 inches diameter. Manufactured to ASME B94.11M standards.

This bit is designed for production drilling environments including screw machines, drill presses, and CNC machining centers where stub-length rigidity is required. Primary workpiece materials include alloy steel and aluminum. The M42 cobalt material grade provides elevated heat resistance compared to standard high-speed steel, extending tool life when cutting harder alloys or when coolant-through capability is not available. This is a single-piece unit sold individually and is appropriate for use in shop maintenance, fabrication, and light production tooling applications.

Key Features

• Letter E (0.25 inch) diameter with tight tolerance of +0.0000 to -0.0007 inches
• 135-degree split point for self-centering starts without a pilot punch
• M42 cobalt material grade for extended tool life in alloy steel and aluminum
• Parabolic flute with web thinning for improved chip evacuation and reduced thrust
• Screw machine (stub) length at 2.5 inches OAL for maximum rigidity
• Meets ASME B94.11M dimensional standard

Compatibility

Designed as an OEM-style replacement and standard tooling option for screw machines, drill presses, and CNC spindles accepting a 0.25-inch straight cylindrical shank. Suitable for drilling alloy steel and aluminum per Series 2175 application guidelines.

Installation Notes

Install in a compatible chuck or collet rated for 0.25-inch straight shanks and ensure the shank is fully seated before operation. Machinists and tooling technicians should verify spindle speed and feed rate against workpiece material hardness to avoid premature edge wear. No coolant-through capability is present on this bit, so external coolant or cutting fluid application is recommended when drilling harder alloys. Inspect the cutting edges for wear before each use and replace when the split point shows rounding or chipping.