Harvey Tool DDA2500-C4 Jobber Drill Bit 1/4 in Carbide

Product Description

The HARVEY TOOL DDA2500-C4 is a solid carbide jobber length drill bit designed for high-performance drilling in demanding shop environments. The bit measures 0.2500 inches (1/4 inch, decimal diameter 0.2502 inches) in cutting diameter with a 130-degree drill point angle suited for fast, aggressive entry. Overall length is 3.94 inches, with a flute length of 1.6548 inches and a straight cylindrical shank diameter of 0.3152 inches. A Diamond-Like Carbon (DLC) coating reduces friction and heat buildup, making this bit particularly effective in aluminum and composite materials. Installation is typically performed by machinists, toolroom technicians, and CNC operators working in precision metalworking or fabrication settings.

This drill bit is rated for use in aluminum and composite workpiece materials, making it a strong choice for aerospace, automotive, and general fabrication applications where surface finish and hole quality matter. It runs in a right-hand cut, regular spiral flute configuration with a 5xD flute-to-diameter ratio, supporting chip evacuation in shallow to moderate depth holes. The h6 diameter tolerance ensures close-fit hole accuracy. This bit is part of the Miniature High Performance Drills series and is sold individually.

Key Features

• Solid carbide construction for rigidity and long tool life in hard or abrasive materials
• DLC (Diamond-Like Carbon) finish reduces friction and extends performance in aluminum and composites
• 130-degree drill point angle for fast penetration and reduced thrust
• Regular spiral flute with 5xD ratio promotes efficient chip evacuation
• h6 diameter tolerance delivers consistent, close-fit hole sizing
• Straight cylindrical shank compatible with standard drill chucks and collet systems

Compatibility

Designed as a high-performance jobber length drill for use in aluminum and composite workpiece materials. Compatible with standard drill chucks and collet holders accepting a 0.3152-inch straight cylindrical shank.

Installation Notes

This drill bit is installed by machinists and CNC operators in drill presses, machining centers, or hand-held power tools with appropriate collet or chuck capacity. Ensure the machine spindle is fully stopped and the tool is securely clamped before use. Coolant-through is not supported on this bit, so external coolant or cutting fluid application is recommended when drilling aluminum or composite at higher feed and speed rates. Verify spindle RPM and feed rate are appropriate for the workpiece material before operation.