Accupro 20429 Jobber Drill Bit 27/64 in Solid Carbide Tin

Product Description

The ACCUPRO 20429 is a solid carbide jobber-length drill bit designed for precision hole-making in demanding materials. It features a 27/64 inch (0.4200 inch decimal) diameter, a 150-degree drill point angle, and a titanium nitride (TiN) coating that extends tool life by reducing friction and heat buildup at the cutting edge. The three-flute spiral geometry improves chip evacuation compared to standard two-flute designs, making it well-suited for production drilling where feed rates and cycle times matter. Right-hand cutting direction and a straight cylindrical shank allow straightforward chuck mounting in most drill presses, CNC machining centers, and handheld power tools.

This bit is suited for metalworking, fabrication, and maintenance applications where a carbide substrate is required to handle harder workpiece materials or extended run times without frequent regrinding. The 5xD flute-to-diameter ratio and 2.5 inch flute length provide adequate depth capacity for most jobber-length drilling tasks in steel, stainless, cast iron, and similar ferrous and non-ferrous materials. It is a single-piece solid carbide construction with no coolant-through capability, so flood or mist cooling at the surface is recommended when drilling harder alloys at elevated speeds. Machine operators, tool-and-die technicians, and general machinists are the typical end users for this bit.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard materials
• TiN coating reduces cutting friction and extends edge life
• 150-degree point angle provides a self-centering start and reduces thrust force
• Three-flute spiral design improves chip evacuation over standard two-flute jobber bits
• Right-hand cutting, straight cylindrical shank for broad chuck compatibility
• ANSI specification designation ensures dimensional conformance

Compatibility

Designed for use in standard drill chucks and collet systems accepting a straight cylindrical shank in the 0.4000 to 0.5000 inch diameter range. Suitable for CNC machining centers, drill presses, and compatible handheld power tools operating with right-hand spindle rotation.

Installation Notes

Always power down and lock out the spindle before inserting or removing this bit from the chuck or collet. Ensure the shank is fully seated and the chuck is tightened securely before beginning a cut. Carbide is brittle and susceptible to chipping from side loads or interrupted cuts without proper workpiece fixturing, so clamp workpieces firmly. Apply appropriate surface coolant or mist when drilling harder alloys to manage heat and prolong edge life.