Precision Twist Drill 5999777 R51 General Purpose Taper Length Drill Bit 15/16 in HSS

The Precision Twist Drill 5999777 is a Series R51 General Purpose Taper Length Drill Bit in a 15/16 in (0.9375 in) fractional diameter, manufactured from premium High-Speed Steel (HSS). Designed for reliable performance across a wide range of drilling applications, this taper length drill offers extended reach with a longer flute and overall length compared to standard jobber-length drills, making it ideal for deeper hole applications in both machine and portable drill setups.

Key Features:

• Series: R51 General Purpose Taper Length
• Drill Diameter: 15/16 in (0.9375 in)
• Point Angle: 118° conventional point — the industry-standard geometry for drilling metals, wood, and synthetics
• Flute Type: 2-flute spiral, right-hand cut
• Shank Type: Straight (cylindrical) round shank, same diameter as drill size
• Material: High-Speed Steel (HSS)
• Finish: Black oxide — a strongly adhering surface treatment that retains cutting fluid and resists chip-to-tool welding
• Cutting Depth: Up to 6x the drill diameter (6XD)
• Standard: ANSI
• Cutting Direction: Right-hand spiral

The R51 series taper length drills are suitable for drilling magnetic soft steel, structural steel, plain carbon steel, alloy steel, free-machining stainless steel, cast iron, titanium, copper, brass, and bronze. The longer flute and overall length provide the depth and reach required for through-holes and deep-bore work that standard jobber drills cannot reach. The black oxide finish on this larger-diameter drill helps prevent built-up edge formation and improves lubricity during cutting.