Cleveland C12091 Taper Shank Drill Bit Letter E 1MT Hss

Product Description

The CLEVELAND C12091 is a taper shank drill bit designed for drilling operations that require a secure, self-centering Morse taper mount. Sized at Letter E (0.2500 inch), it fits a 1MT spindle and features a 118-degree standard point with web thinning for reduced thrust and easier entry. The flute length measures 2.875 inches and overall length is 6.125 inches. Constructed from high-speed steel with an oxide finish, this bit is suited for general-purpose drilling in metal, wood, and similar materials. It conforms to ASME B94.11M standards and cuts in a right-hand direction with a regular spiral flute pattern.

This drill bit is used in drill presses, milling machines, lathes, and other machine tools equipped with a No. 1 Morse taper spindle or adapter. The taper shank design is common in production and job-shop environments where positive drive and quick tool changes are prioritized. It is appropriate for general-purpose drilling applications in ferrous and non-ferrous metals, plastics, and similar workpiece materials. Machinists, toolroom technicians, and maintenance professionals will find this bit suitable for standard drilling tasks where a standard-point, spiral-flute geometry is called for.

Key Features

• Letter E size (0.2500 inch) with a diameter tolerance of +0.0000 to -0.0007 inches for consistent hole sizing
• No. 1 Morse taper (1MT) shank provides a self-locking, positive drive connection in compatible spindles
• 118-degree standard point with web thinning reduces cutting thrust and improves chip clearance
• High-speed steel construction with oxide finish for general-purpose durability
• Regular spiral flute, right-hand cutting direction suitable for standard drilling operations
• Meets ASME B94.11M dimensional and performance standards

Compatibility

Designed as an OEM-style replacement or direct-fit drill bit for machine tools equipped with a No. 1 Morse taper (1MT) spindle socket or adapter sleeve.

Installation Notes

Installation is performed by machinists or toolroom personnel on machine tools with a compatible 1MT spindle. Before inserting or removing the taper shank, power down and lock out the machine per OSHA lockout/tagout procedures. Clean both the taper shank and spindle bore of chips and oil before seating to ensure full contact and prevent slippage. Do not use this bit in hand-held drilling equipment; taper shank bits require a machine spindle for safe operation.