Cleveland C09731 Extra Length Drill Bit 1/2 in Hss

Product Description

The CLEVELAND C09731 is a 1/2-inch diameter, extra-length high-speed steel drill bit engineered for deep-hole and long-reach drilling applications. Built to Series 950E standards, it features a 118-degree standard point angle with web thinning for improved penetration and reduced thrust. The spiral, regular-helix flute geometry runs 7.5 inches in length, giving chips a clear path out of deep bores. At 10 inches overall length, this bit reaches where standard-length drills cannot. The straight-cylindrical shank measures 1/2 inch in diameter and is compatible with standard drill chucks. Cutting direction is right-hand. This bit is suited for metalworking trades including HVAC, plumbing rough-in, and electrical installation where deep metal penetration through structural steel or cast iron is required.

The C09731 is designed for deeper drilling and long-reach drilling operations in cast iron and steel. It is a general-purpose grade bit appropriate for production shops, maintenance facilities, and field tradespeople who regularly drill through heavy-gauge metal assemblies, structural members, or equipment housings where bit reach is a limiting factor. The oxide finish provides mild surface protection during storage and initial use.

Key Features

• 1/2-inch diameter with a diameter tolerance of +0.0000 to -0.0010 inches for precise hole sizing
• 10-inch overall length and 7.5-inch flute length for deep-hole and long-reach drilling
• 118-degree standard point with web thinning and tapered web configuration for reduced entry thrust
• 2-flute regular spiral geometry promotes efficient chip evacuation in deep bores
• High-speed steel construction with oxide finish for durability in cast iron and steel cutting
• Straight-cylindrical 1/2-inch shank fits standard drill chucks without adapters

Compatibility

Designed for drilling cast iron and steel workpieces; suitable for use with standard drill presses, magnetic drills, and heavy-duty hand drills accepting a 1/2-inch straight-cylindrical shank. Meets ASME B94.11M and ANSI specifications.

Installation Notes

This bit is installed and used by machinists, pipefitters, electricians, and HVAC technicians performing metal drilling operations. Always secure the workpiece before drilling and use appropriate cutting fluid or lubricant when drilling through cast iron or steel to extend bit life and manage heat. Ensure the drill motor is powered off and isolated before changing bits. Consult applicable safety standards and California Proposition 65 guidelines when working with high-speed steel tooling and metal swarf.