Precision Twist Drill 5999442 3/8 in Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999442 is a screw machine length drill bit designed for high-performance metal drilling applications. It measures 0.375 inches (3/8 inch) in diameter with an overall length of 3.125 inches and a flute length of 1.8125 inches. The bit is manufactured from high speed steel with a coated finish and features a 135-degree split point that reduces walking and decreases the thrust needed to start a hole. A tapered web with web thinning improves chip evacuation and cutting efficiency, making this bit well suited for demanding production environments where speed and hole quality matter.

This screw machine length bit is rated for cutting titanium as its primary workpiece material, placing it in the high-performance category for difficult-to-machine metals. The shorter flute-to-diameter ratio of 2.5xD and straight-cylindrical shank are standard for screw machine and turret lathe setups, as well as drill press and CNC applications where rigidity and repeatability are priorities. The right-hand spiral flute geometry and heavy-duty grade designation make it appropriate for production machinists, tool-and-die shops, and maintenance professionals working with hard or abrasive materials. It meets ANSI and NAS 907 standards.

Key Features

• 135-degree split point reduces drill walking and lowers feed force required to start a hole
• Web-thinned, tapered web construction improves chip flow and reduces heat buildup
• High speed steel construction with coated finish for extended tool life in hard materials
• Screw machine length profile (2.5xD flute ratio) provides added rigidity over jobber-length bits
• Rated for titanium as primary workpiece material — suitable for other hard and abrasive metals
• Meets ANSI and NAS 907 standards for dimensional and performance consistency

Compatibility

Designed for use in screw machines, turret lathes, drill presses, and CNC machining centers that accept a straight-cylindrical shank. The R40C series targets high-performance applications involving titanium and similarly demanding workpiece materials.

Installation Notes

Installation and use should be performed by qualified machinists or tool-and-die professionals familiar with proper speeds, feeds, and cutting fluid practices for high speed steel tooling. Secure the straight-cylindrical shank firmly in a compatible chuck before operation, and verify chuck runout is within acceptable tolerances to avoid premature bit wear. Always power down and de-energize the machine before changing tooling. Refer to the machine manufacturer guidelines and applicable ANSI safety standards for appropriate operating parameters.