Precision Twist Drill 5998963 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998963 is a screw machine length drill bit designed for high-performance drilling in demanding shop and production environments. Built from high speed steel with a bright, uncoated finish, this bit features a 0.377-inch (Letter V) diameter, a 118-degree standard point angle, and a web-thinned, tapered web configuration for improved chip evacuation and reduced thrust. The straight-cylindrical shank fits standard drill chucks, and the regular spiral flute pattern promotes efficient cutting in a right-hand direction. Machinists, tool-and-die professionals, and production drilling technicians are the primary users of this type of bit.

This screw machine length bit is suited for production and general-purpose applications where a shorter overall length provides greater rigidity and reduced deflection compared to jobber-length bits. With an overall length of 3.25 inches and a flute length of 1.875 inches, it fits compact setups, drill presses, CNC machining centers, and manual machine tools. The Series R42 designation places it in a recognized family of general-purpose HSS bits. Primary workpiece material is listed as titanium, though the general-purpose grade and HSS construction make it applicable across a range of ferrous and non-ferrous materials in appropriate cutting conditions.

Key Features

• Letter V size: 0.377-inch diameter for precise sizing in standard and metric-adjacent applications
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• High speed steel construction with bright, uncoated finish for general-purpose use
• Screw machine length for increased rigidity and reduced deflection in close-clearance setups
• Right-hand cut with regular spiral flute and 2.5xD flute-to-diameter ratio for chip control
• ANSI-standard specification for consistent dimensional compliance

Compatibility

Designed as a general-purpose screw machine length drill bit in Series R42, compatible with standard straight-shank drill chucks on drill presses, manual mills, CNC machining centers, and hand-held power tools accepting the 0.377-inch shank diameter.

Installation Notes

Machinists and production technicians should ensure the drill chuck is fully tightened and the workpiece is securely clamped before operation. Power down the machine and disconnect the drive before changing or inspecting the bit. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, noting this bit does not support through-coolant delivery. Always verify spindle speed and feed rate are appropriate for the workpiece material and bit diameter before beginning a cut.