Precision Twist Drill 5996937 Jobber Drill Bit 8.6mm

Product Description

The PRECISION TWIST DRILL 5996937 is a jobber-length drill bit designed for general-purpose drilling in a wide range of metalworking applications. Ground from high speed steel with a bright, uncoated finish, it features a 135-degree split-point tip that reduces walking on entry and lowers the thrust needed to penetrate hard materials. The parabolic-style spiral flute with web thinning improves chip evacuation and helps maintain cutting efficiency through deeper passes. At 4-59/64 inches overall length with a 3-3/16 inch flute length, this bit fits standard drill chucks without adapters. It is suited for machinists, fabricators, and maintenance professionals working with ferrous and non-ferrous metals.

This drill bit is intended for drilling operations in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. The straight cylindrical shank seats directly in keyless or keyed chucks on benchtop drill presses, hand drills, and CNC drilling setups. The QC21PM series is built to DIN 338 standards, making it a recognized specification for jobber-length tooling used in production and maintenance environments. The 9xD flute-to-diameter ratio supports drilling depths up to 3.189 inches without requiring a pecking cycle on most materials.

Key Features

• 135-degree standard point angle reduces bit walking and lowers entry thrust on hard materials
• High speed steel construction with bright uncoated finish for general-purpose metalworking
• Web-thinned, tapered web design improves chip flow and reduces heat buildup in the cut zone
• Straight cylindrical shank fits standard drill chucks with no adapter required
• Manufactured to DIN 338 specification for consistent geometry and interchangeability
• Two-flute parabolic spiral supports efficient chip evacuation in through-hole and blind-hole drilling

Compatibility

Designed as a DIN 338 jobber-length drill bit compatible with standard keyless and keyed drill chucks accepting an 8.6 mm straight cylindrical shank. Suitable for use in handheld drills, drill presses, and CNC drilling machines configured for straight-shank tooling.

Installation Notes

Secure the shank fully in the chuck and verify it is centered before starting the spindle. When drilling stainless steel, superalloys, or titanium, use appropriate cutting fluid and reduce feed rate to manage heat buildup and extend tool life. Inspect the cutting edges before each use and replace the bit if chipping or dulling is observed, as a worn point increases thrust and risks workpiece damage. Follow shop safety protocols including eye protection and secure workpiece fixturing.