Precision Twist Drill 5998493 Letter R HSS Jobber Length Drill Bit

The Precision Twist Drill 5998493 is a Letter Size "R" High-Speed Steel (HSS) Jobber-Length Drill Bit designed for reliable performance in a wide range of general-purpose drilling applications. Manufactured by Precision Twist Drill — one of North America's most trusted cutting tool brands — this bit delivers consistent accuracy and long service life in both production and maintenance environments.

Built to industry-standard jobber-length proportions, the Letter R drill bit (.3390" diameter) is ideal for drilling into mild steel, cast iron, aluminum, copper, brass, plastics, and other common materials. The high-speed steel construction resists heat buildup during drilling, extending tool life compared to standard carbon steel bits.

Key Features:

• Size: Letter "R" — .3390" (8.611 mm) diameter
• Material: High-Speed Steel (HSS) for excellent wear and heat resistance
• Style: Jobber-length for versatile reach and rigidity
• Point Angle: Standard 118° point for general-purpose drilling
• Shank: Straight shank for use in standard drill chucks
• Finish: Bright finish (uncoated) for clean, precise drilling
• Flute Style: Standard helix for efficient chip evacuation
• Manufacturer: Precision Twist Drill (PTD), a Made in USA brand with decades of cutting tool heritage

The Precision Twist Drill 5998493 is a dependable choice for machinists, maintenance technicians, and shop professionals who require a correctly-sized drill for tapping, reaming prep, or through-hole applications. Compatible with standard drill presses, hand drills, and CNC equipment with appropriate chucks.