Cleveland C03106 5/16 Inch Hss Jobber Drill Bit 118 Degree

Product Description

The CLEVELAND C03106 is a jobber-length twist drill bit designed for general-purpose drilling in metal, wood, and plastic. Built from high-speed steel (HSS) with a bright uncoated finish, it features a 118-degree standard point angle and a fast spiral flute geometry that promotes efficient chip evacuation. The 5/16-inch diameter and 4.5-inch overall length place it in the standard jobber-length category, making it a common choice for bench drill presses, hand drills, and CNC setups in light manufacturing and maintenance trades. The web-thinned, tapered web construction reduces thrust at the tip and improves center starting on ferrous and non-ferrous workpieces alike.

This drill bit is suited for drilling aluminum, mild steel, and similar materials in residential and light commercial maintenance, fabrication, and HVAC or plumbing rough-in work where 5/16-inch holes are required. The straight-cylindrical shank accepts standard three-jaw chucks without modification. The right-hand cut and fast spiral configuration make it a practical stock item for any service van or shop drill index.

Key Features

• 5/16-inch diameter with a decimal equivalent of 0.3125 inches for precise bit selection
• 118-degree standard point angle with web thinning for reduced entry thrust
• Fast spiral flute geometry for efficient chip removal in aluminum and soft metals
• High-speed steel construction provides durability across a range of workpiece materials
• Straight-cylindrical shank fits standard three-jaw drill chucks without adapters
• Meets ASME B94.11M standards with ANSI specification designation

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard three-jaw chuck accepting a 5/16-inch straight-cylindrical shank; listed primary workpiece material is aluminum, with general-purpose grade suitability for additional common materials.

Installation Notes

Installation is performed by qualified machinists, maintenance technicians, or trade professionals using a drill press, hand drill, or CNC spindle. Secure the shank fully in the chuck and verify runout before drilling. Always wear appropriate eye protection and follow shop safety procedures when operating rotating cutting tools. Do not exceed the recommended speed range for the workpiece material.