Precision Twist Drill 5996974 Jobber Drill Bit 4.5mm

Product Description

The PRECISION TWIST DRILL 5996974 is a 4.5 mm jobber length drill bit designed for general-purpose drilling in metalworking applications. Built from high speed steel with a bright uncoated finish, it features a 135-degree split point and a parabolic spiral flute for efficient chip evacuation and reduced thrust. The straight-cylindrical shank measures 4.50 mm in diameter and seats cleanly in standard drill chucks. The overall length is 3.1496 inches, with a flute length of 1.8504 inches. This bit conforms to DIN 338 standards and is rated heavy duty for consistent performance across a range of workpiece materials.

This drill bit is suited for production and maintenance drilling in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It is a practical choice for machinists, tool-and-die workers, maintenance technicians, and fabricators who need a reliable general-purpose bit for through-hole and blind-hole work. The QC21PM series is built to DIN 338 specifications, making it a direct fit for applications requiring a standardized jobber length geometry. A flute-to-diameter ratio of 10xD supports drilling at moderate depths without excessive deflection.

Key Features

• 4.50 mm diameter with 135-degree split point for reduced walking and lower thrust requirements
• High speed steel construction rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Parabolic spiral flute with web-thinned, tapered web for improved chip removal
• Bright uncoated finish suitable for use with cutting fluids across a wide range of materials
• Straight-cylindrical shank fits standard drill chucks without adapters
• DIN 338 compliant, heavy duty grade, QC21PM series

Compatibility

Designed as a DIN 338-compliant jobber length drill bit for use in standard drill chucks, drill presses, CNC machining centers, and handheld power drills accepting a 4.50 mm straight shank.

Installation Notes

Installation is performed by machinists or maintenance technicians using a drill press, CNC machine, or handheld power drill. Secure the shank fully in the chuck and verify runout before drilling. Use an appropriate cutting fluid or coolant when drilling steel, stainless steel, or hard materials to extend tool life and maintain surface finish. Ensure the workpiece is properly clamped before operation to prevent movement and bit breakage.