Precision Twist Drill 5998873 Jobber Drill Bit Letter L Hss

Product Description

The PRECISION TWIST DRILL 5998873 is a jobber-length drill bit sized to Letter L (0.290 inches) and manufactured from high-speed steel with a bright, uncoated finish. The bit features a standard 118-degree point angle, a regular spiral flute with web thinning, and a straight-cylindrical shank for use in standard drill chucks. At 4.25 inches overall length with a 2.9375-inch flute length, this is a general-purpose two-flute drill intended for right-hand cutting. It conforms to ANSI standards and is suited for machinists, maintenance technicians, and fabricators performing everyday drilling operations in a wide range of materials.

This drill bit is designed for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium in general-purpose shop and field applications. The tapered web configuration and web-thinned point reduce thrust requirements and improve chip evacuation. It fits any drill press, mill, or handheld drill with a straight-shank chuck. It belongs to the R10P-R15P-R18P series and carries a flute-to-diameter ratio of 10xD, making it well suited for through-hole drilling at moderate depths.

Key Features

• Letter L size — 0.290 inches diameter, straight-cylindrical shank for universal chuck compatibility
• 118-degree standard point angle with web-thinned, tapered web construction to reduce entry thrust
• High-speed steel construction, bright uncoated finish — suitable for re-sharpening
• Two regular spiral flutes for efficient chip removal during through-hole drilling
• Maximum drilling depth of 2.9375 inches — supports full flute-length engagement
• ANSI-compliant geometry; rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium

Compatibility

Designed as an OEM-style general-purpose jobber-length drill bit compatible with any standard straight-shank drill chuck accepting a 0.290-inch shank diameter.

Installation Notes

Installation and use of this bit should be performed by a qualified machinist or trades professional familiar with drilling operations. Secure the shank fully in the chuck and verify runout before beginning a cut. Always wear eye protection and ensure the workpiece is clamped or fixtured before drilling. Do not exceed the bit's rated maximum drilling depth of 2.9375 inches per pass without retracting to clear chips.