DRILL BIT #40 Stub Cobalt Threaded - Brown Aviation Tool

The Brown Aviation Tool 31098 #40 Stub Cobalt Threaded Drill Bit is engineered for precise, demanding professional drilling tasks across automotive, aerospace, and general industrial applications. Constructed from high-quality cobalt steel, this drill bit offers exceptional durability and extended tool life, specifically designed to withstand the rigors of drilling through tough, high-strength materials. Its unique stub length and threaded shank ensure superior rigidity, stability, and accuracy in critical operations.

Key Features

• Cobalt Steel Construction: Provides superior heat resistance and extended durability when drilling hard metals, high-tensile strength materials, and abrasive alloys encountered in professional settings.
• #40 Diameter: Delivers a precise 0.0980-inch (2.489 mm) hole size, essential for accurate fastener installation, pilot hole creation, or specific instrumentation requirements.
• Stub Length Design: Enhances rigidity and minimizes deflection, ensuring consistent, accurate holes and reducing bit breakage, especially in confined spaces or when deep drilling is not required.
• Threaded Shank (1/4-28): Designed for secure, direct mounting in compatible 1/4-28 threaded drill chucks or holders, offering enhanced stability, preventing slippage, and ensuring wobble-free drilling during high-torque applications.

Applications

This professional-grade drill bit is an essential tool for technicians and mechanics in a variety of challenging environments. It excels at creating precise pilot holes for tapping threads or preparing surfaces for secure rivet installations in automotive repair shops, manufacturing facilities, and aerospace maintenance. Its robust construction is ideal for drilling into demanding materials such as stainless steel, titanium, cast iron, and other high-strength alloys frequently found in engine components, machinery, and airframe construction. The stub length design is particularly beneficial for operations in tight quarters or when working on components where deep penetration is not desired, offering excellent control and reduced runout.