Precision Twist Drill 5996417 Extra Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5996417 is a 0.25 inch diameter extra length high speed steel drill bit built for deep-hole drilling in production and maintenance environments. Part of the QC1290P series, it features a 135-degree split point for self-centering entry and a parabolic flute profile that promotes aggressive chip evacuation and reduced heat buildup. With a 12 inch overall length and a 9 inch flute length, this bit reaches deep into workpieces where standard-length drills fall short. It is uncoated HSS, ground to ANSI standards, and rated as a high-performance grade. Machinists, tool and die technicians, and maintenance mechanics reach for this bit when depth and chip clearance are the primary concerns.

This drill bit is suited for a wide range of ferrous and non-ferrous materials in both shop and field applications. The split-point tip eliminates the need for a center punch on most materials, and the web-thinned, tapered web configuration reduces thrust and improves penetration efficiency. Right-hand cutting direction with a straight cylindrical shank fits standard three-jaw chucks and collet systems without adapter hardware. Typical applications include structural fabrication, HVAC ductwork penetrations, electrical conduit routing, plumbing rough-in, and general metalworking where deep reach is required in a single pass.

Key Features

• 135-degree split point for self-centering starts without a center punch
• Parabolic flute geometry promotes fast chip evacuation in deep holes
• 12 inch overall length with 9 inch flute length for deep-reach drilling
• Web-thinned tapered web reduces cutting thrust and extends bit life
• High speed steel construction, uncoated, compatible with a broad material range
• ANSI-standard ground, high-performance grade for production and heavy maintenance use

Compatibility

Compatible workpiece materials include aluminum, aluminum alloy, brass, bronze, carbon steel, cast iron, graphite, hardened steel, magnesium, magnesium alloy, malleable iron, nickel, stainless steel, steel, structural steel, tempered steel, thermoplastics, and thermosetting plastics. The 0.25 inch straight cylindrical shank fits any standard drill chuck or collet accepting 1/4 inch round shanks.

Installation Notes

Secure the shank fully in the chuck or collet before drilling and verify that the workpiece is clamped or fixtured to prevent rotation. Use appropriate cutting fluid or lubricant when drilling ferrous metals or stainless steel to control heat and extend cutting edge life. Peck drilling in stages is recommended for deep holes to clear chips and prevent bit deflection. Disconnect power to any power tool before changing or inspecting drill bits.