Precision Twist Drill 5998822 Drill Bit Letter L Hss

Product Description

The PRECISION TWIST DRILL 5998822 is a jobber-length drill bit sized at letter L (0.290 inch decimal equivalent) designed for general-purpose drilling in a wide range of materials. Manufactured from high speed steel with a steam oxide coating, it features a standard 118-degree split point and a regular spiral flute geometry with web thinning for improved chip evacuation and reduced thrust. The straight-cylindrical shank and two-flute configuration make it compatible with standard drill chucks. Licensed HVAC technicians, machinists, plumbers, and general trade professionals reach for this bit when drilling through steel, stainless steel, cast iron, non-ferrous metals, and superalloys.

This bit suits a broad range of drilling tasks across residential and commercial trade work. Its 4.25-inch overall length and 2.9375-inch maximum drilling depth cover most through-hole and blind-hole applications in structural steel, pipe, sheet metal, and similar workpieces. The Series R10-R15-R18 designation places it in Precision Twist Drill standard jobber-length lineup, meeting ANSI specifications. It is sold individually and is well suited for service vehicles, shop inventory, or task-specific toolkits where a reliable letter-L bit is needed on demand.

Key Features

• Letter L size — 0.290 inch decimal equivalent for precise hole sizing
• High speed steel construction with steam oxide coating for corrosion resistance and reduced friction
• 118-degree standard point angle with web thinning for lower entry thrust
• Regular spiral, two-flute design promotes efficient chip clearing
• Straight-cylindrical shank fits standard keyed and keyless drill chucks
• ANSI-compliant jobber-length geometry — 4.25-inch OAL, 2.9375-inch flute length

Compatibility

Designed for general-purpose drilling in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. Fits any standard drill chuck accepting a 0.290-inch straight-cylindrical shank. Conforms to ANSI jobber-length standards (Series R10-R15-R18).

Installation Notes

Install in a drill press, hand drill, or right-angle drill with the chuck tightened securely before use. Apply cutting fluid or coolant when drilling stainless steel, superalloys, or hard materials to extend tool life and prevent work hardening. Reduce feed pressure as the bit exits the workpiece to avoid grab and bit breakage. Inspect the cutting edges for wear before each use — a dull bit generates excess heat and can damage the workpiece or the tool.