Precision Twist Drill 5999742 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5999742 is a taper length drill bit designed for general-purpose drilling across a wide range of materials. Built from high speed steel (HSS) with a bright/uncoated finish, it features a 118-degree standard point angle and a web-thinned, tapered web configuration that reduces thrust and improves chip evacuation. The straight shank measures 27/32 inch (0.8438 inches) in diameter, matching the bit diameter for use in standard drill chucks. Overall length is 10 inches, with a flute length of 6.125 inches, giving a flute-to-diameter ratio of 6xD. This bit is suited for machinists, fabricators, and maintenance technicians working with production or job-shop drilling applications.

The 5999742 is rated for right-hand, spiral-flute cutting and conforms to ANSI standards under Series R51. It is appropriate for drilling alloy steel, carbon steel, stainless steel, cast iron, malleable iron, aluminum, aluminum alloy, brass, bronze, high strength bronze, copper, magnesium, magnesium alloy, nickel, nickel alloy, cermet, graphite, and reinforced plastic materials. The taper length body provides additional rigidity compared to jobber-length bits, making it a practical choice when drilling deeper holes or when extra reach is needed without sacrificing stiffness.

Key Features

• High speed steel construction for durability across ferrous and non-ferrous materials
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• Taper length design at 10 inches OAL with 6.125-inch flute length for extended reach
• Bright/uncoated finish suitable for general-purpose applications
• Right-hand spiral flute for standard drilling operations
• ANSI-compliant Series R51 construction

Compatibility

Designed as a general-purpose taper length drill bit compatible with standard drill chucks accepting a 27/32-inch straight shank. Suited for use in drill presses, magnetic drills, and milling machines across production and maintenance environments.

Installation Notes

This bit is installed and removed by a licensed machinist or qualified technician using a standard keyed or keyless chuck rated for the shank diameter. Ensure the machine spindle is fully stopped and power is locked out before changing bits. Secure the shank firmly in the chuck to the full depth of the chuck jaws to prevent runout. Do not exceed the rated cutting speed for the material being drilled.