Precision Twist Drill 5996542 Letter R HSS Jobber Length Drill Bit

The Precision Twist Drill 5996542 is a Letter Size "R" (0.3390") High-Speed Steel jobber length drill bit engineered for reliable performance across a wide range of drilling applications. Manufactured by Precision Twist Drill — a trusted name in cutting tool manufacturing since 1882 — this bit delivers consistent, accurate holes in steel, cast iron, aluminum, brass, and other common materials.

Key Features:

• Letter Size R: 0.3390" (8.611 mm) diameter for precise, standardized sizing
• High-Speed Steel (HSS) Construction: Provides excellent wear resistance and durability for general-purpose drilling
• Jobber Length: Standard flute-to-overall-length ratio ideal for the majority of through-hole and blind-hole applications
• 118° Point Angle: Traditional split-point geometry for accurate starting and reduced walking on entry
• Black Oxide Finish: Reduces friction, improves chip evacuation, and provides mild corrosion resistance
• Right-Hand Cut, Right-Hand Spiral: Compatible with standard drill presses, CNC machines, and handheld power drills

Precision Twist Drill's jobber bits are manufactured to ANSI standards and are a staple in machine shops, maintenance facilities, and industrial environments. The 5996542 is ideal for production drilling, repair work, and general metalworking tasks requiring a dependable, accurately sized cutting tool.