Accupro 4500384 1/4 Inch Carbide Drill Bit 140 Degree

Product Description

The ACCUPRO 4500384 is a solid carbide screw machine length drill bit designed for high-performance drilling in demanding applications. With a 1/4 inch (0.2500 inch) diameter and a 140-degree web-thinned point, this bit delivers fast, accurate entry and reduced thrust force compared to standard split-point geometries. The TiAlN coating provides thermal resistance and extended tool life when drilling hard and abrasive materials. At 3.465 inches overall length with a 1.279 inch flute length, this is a stub-length bit built for rigidity and minimized deflection in short-reach drilling setups. It is installed and used by machinists and tool-and-die professionals in production drilling environments.

This drill bit is optimized for drilling stainless steels and other hard ferrous materials where heat and work hardening are primary concerns. The TiAlN coating performs well in dry or minimal-lubrication conditions at elevated cutting speeds. The straight cylindrical shank with a 0.2656 inch diameter fits standard drill chucks and collets. Coolant-through capability allows internal delivery of cutting fluid when used in compatible spindles, extending tool life in high-volume production runs. The 3xD flute-to-diameter ratio and regular spiral flute geometry promote reliable chip evacuation in these applications.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard-material drilling
• 140-degree web-thinned (R-Thinned) point reduces thrust and improves self-centering
• TiAlN coating provides heat resistance and extended tool life in stainless steel applications
• Coolant-through design compatible with through-spindle coolant delivery systems
• Right-hand cutting, regular spiral flute for consistent chip evacuation
• Straight cylindrical shank fits standard drill chucks and collets

Compatibility

Part of the ACCUPRO ASSC140-TA-CL series, sized for 0.2500 to 0.3000 inch diameter range applications. Primary workpiece material designation is stainless steels. Designed as a high-performance replacement or production drill bit for use in CNC machining centers and drill presses with compatible chuck or collet tooling.

Installation Notes

This drill bit is intended for use by machinists and trained tooling professionals. Secure the straight shank firmly in a drill chuck or collet before operation and verify runout is within acceptable limits. When using coolant-through capability, confirm the spindle and toolholder support internal coolant delivery before engaging fluid supply. Inspect the cutting edges and coating for wear or chipping before each use and replace if damage is observed.