Cleveland C03643 5/16 Inch Hss Jobber Drill Bit

Product Description

The CLEVELAND C03643 is a jobber-length drill bit designed for general-purpose drilling in metal, aluminum, and similar materials. Manufactured from high speed steel with a bright uncoated finish, this bit features a 118-degree standard point angle and a slow spiral flute configuration optimized for softer metals and non-ferrous materials. The straight-cylindrical shank measures 5/16 inches in diameter, matching the cutting diameter for straightforward chuck compatibility. With a 4.5-inch overall length and a 3-3/16-inch flute length, the C03643 fits standard drill presses, hand drills, and mill setups used by machinists, maintenance techs, and fabricators in shop and field environments.

This bit is well suited for drilling aluminum, light steel, and general fabrication tasks in both production and maintenance settings. The web-thinned, tapered web construction reduces thrust requirements at the cutting tip, making it easier to start holes without center-punching on softer substrates. The right-hand cut and two-flute spiral design clear chips effectively during through-hole drilling. It is sold as a single unit and is a common choice for tool crib replenishment, MRO inventory, and individual trade use.

Key Features

• High speed steel construction for durability across general-purpose drilling applications
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• Slow spiral flute geometry optimized for aluminum and non-ferrous workpiece materials
• Bright uncoated finish suitable for dry cutting and standard lubricated operations
• Straight-cylindrical shank for universal chuck compatibility
• Conforms to ASME B94.11M and ANSI specification designation

Compatibility

Designed as a general-purpose replacement or stock bit for standard 3/8-inch or larger keyed and keyless drill chucks; compatible with drill presses, hand drills, and milling machine setups that accept a 5/16-inch straight shank. Primary workpiece material listed by the manufacturer is aluminum, with general-purpose grade suitability for light ferrous and non-ferrous stock.

Installation Notes

Installation requires seating the straight shank fully into the chuck jaws before tightening to prevent slippage and runout. Machinists and maintenance technicians should verify chuck capacity and shank engagement before operation. Use appropriate cutting fluid when drilling ferrous materials to extend tool life and maintain dimensional tolerance. Inspect the cutting edges for wear before each use; a dull point increases thrust load and can cause workpiece damage or bit breakage.