Precision Twist Drill 5999447 5/64 in Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999447 is a screw machine length high speed steel drill bit designed for demanding metal-cutting applications. It measures 5/64 inch (0.0781 inches) in diameter with an overall length of 1-11/16 inches and a flute length of 11/16 inches. The 135-degree split point reduces walking at entry and requires no center punch in most setups. A web-thinned, tapered web design lowers thrust and improves chip evacuation. This bit is part of the Series R40C and is rated heavy duty and high performance, meeting ANSI and NAS 907 specifications. Licensed HVAC technicians, machinists, and trade professionals who work with titanium and other hard materials will find this bit suited for high-cycle precision drilling tasks.

This drill bit is built for screw machine length applications where a shorter, stiffer profile is needed for accuracy and rigidity in production or bench drilling. The straight-cylindrical shank fits standard drill chucks without adapters. The regular spiral flute with a 2.5xD flute-to-diameter ratio handles chip removal efficiently in harder workpiece materials including titanium, as noted in the manufacturer specifications. It is a single-piece package with a minimum order quantity of 12 units, making it practical for shop stocking.

Key Features

• 135-degree split point reduces drill walking and lowers entry thrust
• Web-thinned tapered web improves chip clearance and reduces heat buildup
• High speed steel construction with coating for extended tool life in hard materials
• Screw machine length profile provides added rigidity compared to jobber length bits
• Right hand cut, regular spiral flute with straight-cylindrical shank for standard chuck compatibility
• Meets ANSI and NAS 907 specifications for consistent dimensional accuracy

Compatibility

Designed as a screw machine length replacement or production-stock drill bit for use with standard drill chucks accepting a straight-cylindrical shank; rated for titanium and other high-performance workpiece materials per manufacturer Series R40C specifications.

Installation Notes

Install and remove drill bits only with the drill press or hand drill fully powered off and the chuck key removed from the chuck. Secure the straight-cylindrical shank fully into the chuck before tightening to prevent runout. When drilling titanium or similarly hard materials, use appropriate cutting fluid and controlled feed pressure to avoid work hardening. Dispose of worn bits per shop safety protocols.