Cleveland C09666 Extra Length Drill Bit 0.2656 in Hss

Product Description

The CLEVELAND C09666 is an extra length, high-speed steel drill bit designed for deeper drilling and long-reach drilling applications where a standard-length bit cannot reach. Built to the 950E series specification, it features a 0.2656-inch diameter, a 118-degree standard point angle, and a spiral flute configuration with web thinning for reduced thrust and cleaner entry. The oxide finish provides mild corrosion resistance during storage and use. This bit is suited for machinists, maintenance technicians, and fabricators who need consistent performance in production or field environments.

This bit is intended for drilling cast iron and steel as primary workpiece materials, with cast iron also listed as a secondary application. The extra length design — with an 8-inch overall length and a 5.5-inch flute length — makes it useful in deep-hole drilling setups, stepped fixtures, or confined-access machining scenarios where bit reach is a limiting factor. It cuts right-hand and uses a straight-cylindrical shank for compatibility with standard drill chucks. General-purpose grade construction makes it appropriate for a wide range of shop and field drilling tasks.

Key Features

• 0.2656-inch diameter with a diameter tolerance of +0.0000 to -0.0010 inches for consistent hole sizing
• 118-degree standard point angle with web thinning and tapered web configuration for reduced entry thrust
• 8-inch overall length and 5.5-inch flute length for deep-hole and long-reach drilling
• High-speed steel construction with oxide finish for general-purpose durability
• Straight-cylindrical shank at 17/64-inch diameter fits standard drill chucks without adapters
• Right-hand spiral flute promotes efficient chip evacuation in cast iron and steel

Compatibility

Designed as a general-purpose extra length drill bit for use in standard drill chucks accepting a straight-cylindrical 17/64-inch shank, suitable for drilling cast iron and steel in machining, fabrication, and maintenance applications.

Installation Notes

Installation and use is performed by machinists, maintenance technicians, or trained fabricators using a drill press, mill, or handheld drill with an appropriate chuck. Secure the workpiece firmly before drilling and confirm the chuck is tightened to prevent bit slippage. Apply cutting fluid when drilling steel to extend tool life and improve finish quality. Inspect the bit for wear or damage before each use, and replace if the cutting edges show chipping or the point geometry is compromised.