Precision Twist Drill 5999346 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999346 is a screw machine length drill bit engineered for high-performance drilling in demanding industrial applications. Built from high speed steel with a coated finish, this bit measures 0.242 inches in diameter and features a 135-degree split point that reduces walking and decreases the thrust required to start a hole. At 2.5 inches overall length with a 1.375-inch flute length, it is designed to fit standard straight-cylindrical shank drill chucks. The web-thinned, tapered web construction improves chip evacuation and extends tool life in tough materials.

This drill bit is rated for primary use in titanium and other difficult-to-machine materials, making it a practical choice for aerospace, precision machining, and heavy-duty fabrication environments. The right-hand spiral flute and regular spiral geometry work together to pull chips away from the cutting zone. At a 2.5xD flute-to-diameter ratio, the screw machine length body keeps the bit rigid during short, high-precision boring operations in CNC machines, drill presses, and turret lathes. The R42C series designation identifies this as a heavy-duty grade bit conforming to ANSI and NAS 907 standards.

Key Features

• 0.242 inch diameter, Letter Size C, within the 0.2000 to 0.2500 inch range
• 135-degree split point reduces drill walking and lowers required thrust
• Web-thinned tapered web improves chip flow and reduces heat buildup
• High speed steel construction with coated finish for extended wear resistance
• Screw machine length body provides added rigidity for precision boring
• Conforms to ANSI and NAS 907 specifications for heavy-duty industrial use

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for applications requiring a straight-cylindrical shank screw machine length bit in the 0.2000 to 0.2500 inch diameter range, conforming to ANSI and NAS 907 standards. Primary workpiece material is titanium, though the high speed steel construction suits a range of ferrous and non-ferrous metals in production drilling environments.

Installation Notes

Installation and use should be performed by qualified machinists or tool and die professionals familiar with drill press, CNC, or turret lathe operation. Ensure the spindle is fully stopped and the machine is powered down before securing or removing the bit from the chuck. Verify chuck compatibility with straight-cylindrical shank tooling before mounting. Appropriate cutting fluid or coolant should be applied per shop practice when drilling titanium or other high-strength materials, even though this bit does not feature through-coolant capability.