Precision Twist Drill 5997108 Jobber Drill Bit 40 Hss

Product Description

The PRECISION TWIST DRILL 5997108 is a high speed steel jobber-length drill bit in wire gauge size 40, with a decimal diameter of 0.0980 inches and a 135-degree split-point tip. It is built for right-hand rotation with a regular spiral flute and a straight cylindrical shank measuring 0.2500 inches in diameter. The 135-degree point geometry reduces the thrust needed to start a hole and is web-thinned to improve chip clearance. This bit is suited for drilling operations in steel, aluminum, and other non-ferrous materials. It is installed and used by machinists, maintenance technicians, and trade professionals requiring a precise small-diameter drill in general-purpose applications.

The 5997108 is designed for general-purpose drilling in production and maintenance environments. Its wire gauge 40 size makes it a go-to for tapping prep, instrument work, and small fastener clearance holes in steel and non-ferrous stock. The 2.3750-inch overall length and 1.3750-inch flute length provide adequate reach for typical bench and drill press work without sacrificing rigidity at this small diameter. The series QC21P designation places it within a standardized jobber-length family built to ANSI specifications.

Key Features

• Wire size 40 with 0.0980-inch decimal diameter for precise small-bore drilling
• 135-degree standard point with web thinning reduces walking and lowers required thrust
• High speed steel construction handles steel, aluminum, and non-ferrous workpieces
• Bright uncoated finish is compatible with a wide range of cutting fluids
• Regular spiral flute with tapered web promotes chip evacuation in through-hole applications
• Straight shank fits standard drill chucks without adapters

Compatibility

Designed as a general-purpose jobber-length drill bit suitable for use in handheld drills, drill presses, and CNC drilling operations where a straight-shank wire gauge 40 bit is specified.

Installation Notes

This drill bit is installed and operated by machinists, maintenance technicians, and trade professionals using standard drill chucks rated for the 0.2500-inch shank diameter. Secure the shank fully in the chuck before operation and confirm the chuck key is removed prior to starting the machine. Use appropriate cutting fluid when drilling steel to extend tool life and maintain hole quality. Inspect the cutting edges before each use and replace the bit if chipping or dulling is observed.