Precision Twist Drill 5998691 No. 24 Hss Screw Machine Drill

Product Description

The PRECISION TWIST DRILL 5998691 is a No. 24 wire-size screw machine length drill bit engineered for high-performance drilling in demanding trade applications. Built from high-speed steel with a coated finish, it measures 0.1520 inches in diameter and 2-1/16 inches overall length with a 1-inch flute length. The 135-degree split point with web thinning reduces thrust force and improves centering on contact, eliminating the need for a center punch in most setups. The tapered web configuration adds rigidity while the regular spiral flutes evacuate chips efficiently. This bit is rated for heavy-duty use and conforms to ANSI and NAS 907 standards.

This bit is sized for light metalworking and precision drilling tasks where a short, rigid cutting length is required. The screw machine length profile — shorter than jobber-length bits — minimizes deflection in drill press, CNC, and turret lathe applications. It is rated for titanium as a primary workpiece material, making it suitable for aerospace, defense, and precision machining environments. Machinists, tool-and-die technicians, and maintenance mechanics working with tight tolerances and hard-to-machine alloys will find this bit appropriate for production and repair drilling alike.

Key Features

• No. 24 wire size, 0.1520-inch decimal diameter for precise bore sizing
• 135-degree split point with web thinning reduces entry thrust and improves self-centering
• Screw machine length (2-1/16 inches OAL) delivers greater rigidity and reduced runout versus jobber-length bits
• High-speed steel construction with coated finish for extended tool life
• Right-hand cut, straight-cylindrical shank compatible with standard drill chucks and collets
• Meets ANSI and NAS 907 specifications for dimensional consistency

Compatibility

Designed as a screw machine length replacement bit in the R41C series, suitable for drill presses, CNC machining centers, turret lathes, and hand-held drill chucks accepting a 0.1520-inch straight-cylindrical shank. Rated for titanium and falls within the 0.1500 to 0.2000 inch drill bit size range of the R41C series lineup.

Installation Notes

Machinists and toolroom technicians should de-energize and lock out the machine before changing bits. Verify chuck or collet runout before seating the shank to preserve cutting geometry. Cutting fluid or coolant is recommended when drilling titanium or other high-strength alloys to manage heat buildup, as this bit does not support coolant-through delivery. Inspect the split point for chipping after use on hard materials before returning the bit to service.