Precision Twist Drill 5999551 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5999551 is a taper length straight-shank drill bit sized at 0.2420 inches in diameter, designated as Letter C. Built from high speed steel with a bright uncoated finish, it features a 118-degree standard point angle and a right-hand spiral flute. The taper length body provides extra reach compared to a jobber-length bit while maintaining rigidity. Web thinning reduces thrust at the tip and improves chip evacuation. This is a general-purpose bit suited for machine shop, maintenance, and fabrication use across a wide range of materials.

The 5999551 is appropriate for drilling in alloy steel, carbon steel, stainless steel, cast iron, malleable iron, hardened steel, aluminum, aluminum alloy, brass, bronze, high strength bronze, copper, nickel, nickel alloy, magnesium, magnesium alloy, cermet, graphite, and reinforced plastics. It fits standard drill chucks and is used in drill presses, milling machines, and hand-held power drills wherever a taper length reach is required. The Series R55 designation places it within a recognized general-purpose product family built to ANSI standards.

Key Features

• 0.2420 inch diameter, Letter C size designation
• High speed steel construction for broad material compatibility
• 118-degree standard point angle with web-thinned tip for reduced entry thrust
• 3.75 inch flute length at a 6xD flute-to-diameter ratio for extended reach applications
• 6.125 inch overall length for taper length clearance in deeper setups
• Right-hand cut, regular spiral flute, straight shank — fits standard chucks without adapters
• Bright uncoated finish; no coolant-through feature required for general-purpose work

Compatibility

Designed as a general-purpose taper length drill bit compatible with any standard drill chuck accepting a 0.2420 inch straight shank. Suitable for use across the material types listed in the application paragraph above, per ANSI Series R55 specifications.

Installation Notes

Installation is performed by machinists or maintenance technicians in machine shop or field environments. Secure the straight shank fully in a properly sized drill chuck before operation and verify chuck key is removed before spindle engagement. Use appropriate cutting fluid for harder materials such as stainless steel or hardened steel to extend tool life. Inspect the cutting edges for wear or chipping before each use and replace if the point geometry is compromised.