Precision Twist Drill 5996346 Letter I Drill Bit Hss

Product Description

The PRECISION TWIST DRILL 5996346 is a jobber-length drill bit sized to letter I (0.2720 inches decimal equivalent) for use in general-purpose drilling applications. Ground from M2 high speed steel with a purple/bronze coating, it features a 135-degree split-point tip with web thinning for reduced thrust and faster entry into ferrous materials. The straight cylindrical shank is compatible with standard drill chucks. With an overall length of 4.125 inches and a 2.875-inch flute length, this bit suits the working envelope of most bench-top and handheld drills used by machinists, pipefitters, and maintenance technicians.

This bit is designed for drilling steel, stainless steel, cast iron, superalloys, and titanium. The two-flute spiral design with a regular spiral type and tapered web configuration promotes chip evacuation in deep-hole applications up to 2.875 inches. The 11xD flute-to-diameter ratio makes it appropriate for through-hole and blind-hole work in both production and field maintenance settings where a durable, reliable general-purpose bit is required.

Key Features

• Letter I size — 0.2720 inches decimal equivalent for precision-fit hole sizing
• 135-degree split point with web thinning reduces walking and lowers required drilling thrust
• M2 high speed steel construction retains hardness at elevated cutting temperatures
• Purple/bronze coating provides added lubricity and surface hardness
• Right-hand cut, straight cylindrical shank fits standard 3-jaw drill chucks
• ANSI-compliant geometry — Series HX10/HX15/HX18

Compatibility

Designed as a general-purpose jobber-length replacement bit for use in standard drill chucks accepting a 0.2720-inch straight cylindrical shank. Rated for drilling steel, stainless steel, cast iron, superalloys, and titanium (workpiece material codes P, M, K, S).

Installation Notes

Secure the shank fully in the drill chuck and verify runout before drilling. Always wear appropriate eye protection and secure the workpiece before starting the cut. Apply cutting fluid when drilling stainless steel, superalloys, or titanium to extend tool life and reduce work hardening. Inspect the cutting edges for wear or chipping after use on hard materials and replace the bit before edge degradation affects hole quality.