Cleveland C73427 Jobber Drill Bit 31/64 in Hss

Product Description

The CLEVELAND C73427 is a jobber-length twist drill bit designed for production and maintenance drilling in metal fabrication, mechanical, and general trade applications. Manufactured from high speed steel with a bright uncoated finish, it measures 31/64 inch (0.4844 inch) in diameter and features a 118-degree split point for accurate starting and reduced walking on flat surfaces. The overall length is 5-7/8 inches with a 4-3/8 inch flute length, giving it the reach needed for through-hole work in standard stock thicknesses. This is a heavy duty grade bit meeting NAS 907 Type A specifications, suitable for machinists, millwrights, and maintenance technicians who need consistent, repeatable hole quality.

The C73427 is suited for drilling aluminum as its primary workpiece material, though its high speed steel construction handles a range of softer metals and plastics encountered in general shop and field work. The straight-cylindrical shank with a 1.5-inch shank length fits standard three-jaw drill chucks on bench drills, floor-standing drill presses, and handheld drill drivers. Its regular spiral, two-flute design promotes efficient chip evacuation, keeping the flutes clear during continuous cuts. This bit is a practical choice for HVAC fabricators, plumbers, electricians, and mechanical contractors who drill sheet metal, structural aluminum, or electrical enclosures on the job.

Key Features

• 31/64 inch (0.4844 inch) diameter, heavy duty grade per NAS 907 Type A
• 118-degree split point reduces thrust and improves self-centering on entry
• High speed steel construction with bright uncoated finish
• Web-thinned, tapered web configuration for lower cutting resistance
• Two-flute regular spiral design for efficient chip removal
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a standard jobber-length drill bit compatible with any drill press or handheld drill equipped with a chuck sized to accept a 0.4844-inch straight-cylindrical shank. Primary workpiece material is aluminum; suitable for general non-ferrous and soft ferrous applications.

Installation Notes

Install the bit securely in a keyed or keyless chuck and verify the shank seats fully before operation. Secure the workpiece with clamps or a vise before drilling to prevent rotation and maintain hole accuracy. Use cutting fluid or lubricant when drilling metal to extend bit life and improve finish quality. Inspect the cutting edges before each use and retire the bit if chipping or excessive wear is observed.