Precision Twist Drill 5996378 Drill Bit Letter Q Hss

Product Description

The PRECISION TWIST DRILL 5996378 is a jobber-length drill bit sized to Letter Q (0.3320 inches decimal equivalent) and built from M2 high speed steel with a purple/bronze coating. The 135-degree split-point tip reduces walking and cutting force on entry, making it well suited for production and maintenance drilling in harder materials. A tapered web with web thinning further reduces thrust load. The straight-cylindrical shank fits standard three-jaw drill chucks without an adapter. This bit is intended for use by machinists, millwrights, maintenance technicians, and metal fabricators.

The 5996378 is engineered for drilling steel, stainless steel, cast iron, superalloys, and titanium. Its regular spiral flute geometry and 10xD flute-to-diameter ratio provide good chip evacuation in these materials. Overall length is 4.75 inches with a flute length of 3.4375 inches, giving adequate reach for most jobber-length applications on manual drill presses, CNC machining centers, and handheld power drills. It carries an ANSI specification designation and belongs to Precision Twist Drill Series HX10/HX15/HX18.

Key Features

• Letter Q size — 0.3320 inches decimal equivalent for precise hole sizing
• 135-degree split-point tip reduces walking and lowers required thrust force
• M2 high speed steel construction with bronze coating for heat and wear resistance
• Tapered web with web thinning reduces cutting resistance in tough alloys
• Right-hand cut, regular spiral flute for efficient chip removal
• Straight-cylindrical shank compatible with standard drill chucks — no adapter needed

Compatibility

Designed for jobber-length drilling applications in steel, stainless steel, cast iron, superalloys, and titanium. Fits any standard drill chuck accepting a 0.3320-inch straight-cylindrical shank. Part of Precision Twist Drill Series HX10/HX15/HX18.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance technicians familiar with machine tool operation. Secure the shank fully in the chuck and verify runout before beginning a cut. Follow the drill press or machine tool manufacturer guidelines for feed rate and speed selection based on workpiece material. Always use appropriate eye protection and ensure the workpiece is firmly clamped before drilling.