Accupro 4500028 Solid Carbide Jobber Drill Letter N

Product Description

The ACCUPRO 4500028 is a solid carbide jobber-length drill bit sized to Letter N (0.3020 inches) with a 140-degree split point designed for precision drilling in hard and abrasive materials. The TiAlN (titanium aluminum nitride) coating increases surface hardness and heat resistance, extending tool life in demanding production environments. A slow spiral flute geometry promotes chip evacuation in tough alloys and stainless steels. The straight cylindrical shank measures 0.3750 inches in diameter for secure chuck engagement. This drill is suited for machinists, tool and die shops, and maintenance trades requiring tight-tolerance hole making.

The 4500028 is a right-hand cutting, two-flute jobber drill with an overall length of 3.875 inches and a flute length of 1.9688 inches, yielding a 4xD flute-to-diameter ratio. It is appropriate for CNC machining centers, drill presses, and hand-held power tools with compatible chucks. Typical applications include drilling through steel, stainless steel, cast iron, and high-temperature alloys where standard HSS bits wear prematurely. The UR-thinned web reduces entry thrust and minimizes walking at the start of the cut.

Key Features

• Solid carbide construction for maximum rigidity and wear resistance in hard materials
• TiAlN coating enhances heat resistance and extends tool life in high-speed applications
• 140-degree proprietary point geometry reduces thrust and improves hole entry accuracy
• Slow spiral flute design promotes chip clearance in gummy or stringy metals
• UR-thinned web lowers cutting forces and reduces drill walking
• Straight cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a DIN-specification jobber drill for use in CNC machining centers, drill presses, and compatible power tool chucks accepting a 0.3750-inch straight shank.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with cutting tool safety. Secure the shank fully in the chuck before operation and verify runout before beginning production drilling. Always power down and lock out the machine spindle before changing tooling. Follow the machine manufacturer and cutting tool supplier recommendations for feed rate and surface speed when working with carbide tooling to avoid chipping the cutting edge.