Precision Twist Drill 5999451 9/32 Inch Hss Drill Bit

Product Description

The PRECISION TWIST DRILL 5999451 is a screw machine length (stub length) drill bit designed for high-performance drilling in demanding trade and industrial applications. Built from high speed steel (HSS) with a coated finish, it features a 135-degree split point that reduces walking and cutting torque at the start of a hole. The straight-cylindrical shank seats cleanly in standard drill chucks. At 0.2812 inches (9/32 inch) in diameter with an overall length of 2-11/16 inches and a flute length of 1-1/2 inches, this bit is engineered for rigidity and precision in short-reach setups.

This drill bit is rated for primary use on titanium workpieces, making it a strong choice for aerospace, industrial maintenance, and mechanical contractors working with difficult-to-machine alloys. The R40C series, web-thinned and heavy duty graded, fits screw machine operations, CNC drilling, and hand-held drill press work where stub-length rigidity reduces deflection. The 2.5xD flute-to-diameter ratio supports chip evacuation in shallow-to-moderate depth holes. It conforms to ANSI and NAS 907 standards. Sold individually.

Key Features

• 135-degree split point reduces thrust and prevents bit walking on entry
• Web-thinned, tapered web configuration for reduced cutting resistance in hard alloys
• High speed steel construction with coated finish for extended service life
• Screw machine (stub) length provides added rigidity and minimizes deflection
• Right-hand spiral flute promotes efficient chip evacuation
• Meets ANSI and NAS 907 standards; heavy duty grade for high-demand applications

Compatibility

Designed as an OEM-style screw machine length drill bit in the R40C series, rated for drilling titanium and similarly hard workpiece materials in standard drill chucks accepting a straight-cylindrical shank.

Installation Notes

Installation is performed by machinists, tool-and-die technicians, and mechanical tradespeople using a drill press, lathe tailstock, or CNC machining center. Secure the straight-cylindrical shank fully in the chuck before operation. When drilling titanium or hard alloys, use appropriate cutting fluid and controlled feed rates to prevent work hardening. Inspect the cutting edges for wear or chipping before each use and replace the bit if the point geometry is compromised.