Accupro 4500108 Jobber Drill Bit 0.2280 in Solid Carbide

Product Description

The ACCUPRO 4500108 is a solid carbide jobber-length drill bit sized at wire size 1 (0.2280 inches decimal), designed for precision hole-making in hard and abrasive materials. It features a 140-degree proprietary point angle that reduces thrust and improves centering on entry. The TiAlN coating provides high heat resistance, making it well suited for dry or semi-dry cutting in hardened steels, stainless alloys, and cast iron. The UR-thinned web reduces cutting forces at the tip. With a 3.0-inch overall length and 0.2500-inch straight shank, it fits standard drill chucks and collets. Machinists and tool-and-die professionals are the primary users.

This drill bit is intended for use in CNC machining centers, drill presses, and hand-held power tools where a straight-shank carbide bit is required. The slow spiral flute geometry is optimized for harder workpiece materials where chip evacuation must be controlled. The 1-13/32-inch flute length accommodates moderate hole depths at a 4xD flute-to-diameter ratio. The DIN specification designation confirms it meets recognized dimensional standards for jobber-length tooling. It is sold individually and is a direct fit for applications requiring wire size 1 diameter in the 0.2000 to 0.2500 inch size range.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard materials
• TiAlN coating for elevated heat resistance in dry and semi-dry cutting applications
• 140-degree proprietary point angle reduces entry thrust and improves self-centering
• Slow spiral flute geometry controls chip flow in harder workpiece materials
• UR-thinned web lowers cutting forces at the drill tip
• 0.2500-inch straight-cylindrical shank fits standard chucks and collets

Compatibility

Designed as an OEM-style jobber drill for machining applications requiring a wire size 1 (0.2280 inch) solid carbide bit with a 0.2500-inch straight shank, compatible with drill chucks and collets accepting bits in the 0.2000 to 0.2500 inch diameter range per DIN jobber-length standards.

Installation Notes

Installation and use should be performed by qualified machinists or tool operators familiar with carbide tooling. Ensure the machine spindle and chuck or collet are clean and free of runout before seating the shank. Carbide is brittle compared to high-speed steel; avoid lateral loading or interrupted cuts that could cause chipping. Confirm appropriate feeds and speeds for the workpiece material before starting the cut.