Accupro 4500038 Solid Carbide Jobber Drill Bit Letter J

Product Description

The ACCUPRO 4500038 is a solid carbide jobber-length drill bit sized to Letter J (0.2770 inches) with a 140-degree split point designed for drilling hardened materials. The TiAlN coating provides thermal resistance and extended tool life under high-speed cutting conditions. At 3.375 inches overall length with a 1.7813-inch flute length, this bit fits standard drill chucks via its 0.375-inch straight cylindrical shank. The slow spiral flute geometry is engineered to maintain cutting stability and chip evacuation in dense, hard workpieces. This drill is intended for machinists, toolroom technicians, and precision fabricators working with hardened steels and similar materials.

The 4500038 is suited for production and maintenance machining environments where hardened steel, tool steel, or similarly difficult workpiece materials are encountered. The DIN specification designation confirms dimensional compliance with recognized international standards. Its UR-thinned web reduces entry thrust while the slow spiral geometry controls chip load in tough materials. Typical applications include toolroom operations, die and mold work, and precision component fabrication where standard high-speed steel bits are insufficient.

Key Features

• Solid carbide construction for rigidity and heat resistance in hardened-material drilling
• TiAlN coating for elevated thermal protection and extended tool life
• 140-degree proprietary split point for reduced walking and lower thrust at entry
• Slow spiral (slow helix) flute geometry optimized for chip control in hard, dense materials
• UR-thinned web to minimize cutting resistance at the drill tip
• DIN-compliant dimensions for consistent fitment in standard toolholding systems

Compatibility

Designed for use in standard drill chucks and collet systems accepting a 0.375-inch straight cylindrical shank. Primary workpiece compatibility is with hardened materials as specified by the manufacturer.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists familiar with CNC or manual drilling equipment. Ensure the machine spindle is fully stopped and secured before inserting or removing the bit from the chuck or collet. Verify chuck or collet runout is within acceptable limits before use, as carbide is brittle and sensitive to lateral loading. This bit does not support coolant-through operation; use appropriate external coolant or cutting fluid application as required by the workpiece material.