Precision Twist Drill 5996591 12mm Hss Jobber Drill

Product Description

The PRECISION TWIST DRILL 5996591 is a 12.00 mm high speed steel jobber-length drill bit designed for general-purpose drilling in metalworking and fabrication applications. Built to DIN 338 standards, it features a 135-degree split point geometry with a web-thinned, tapered web configuration that reduces walking and lowers thrust on entry. The bright uncoated finish keeps the bit ready for use without additional prep. With an overall length of 5.9375 inches and a flute length of 3.9688 inches, this bit fits standard drill chucks and drilling fixtures encountered in production and maintenance settings. Machinists, toolroom technicians, and maintenance professionals reach for this series when drilling steel, aluminum, and other non-ferrous materials.

This drill bit is suited for use in vertical mills, drill presses, and hand-held power drills where a straight-cylindrical shank is required. It targets general-purpose drilling operations in steel, aluminum, and non-ferrous workpiece materials. The right-hand cutting direction and regular spiral flute geometry make it a practical fit for everyday hole-making tasks in shops, maintenance departments, and light fabrication environments. The QC21PM series is positioned for reliable performance across a broad range of material types including ISO material groups P, M, K, N, and S.

Key Features

• 12.00 mm diameter with a matching 12.00 mm straight-cylindrical shank for secure chuck retention
• 135-degree standard point angle with web thinning reduces thrust and improves self-centering on entry
• High speed steel construction provides adequate heat resistance for general-purpose metal drilling
• Bright uncoated finish — no coating delamination risk; regrindable with standard HSS grinding wheels
• DIN 338 specification ensures dimensional consistency and interchangeability with tooling designed to that standard
• Regular spiral flute with 8xD flute-to-diameter ratio supports chip evacuation during moderate-depth drilling

Compatibility

Designed as a general-purpose jobber drill conforming to DIN 338, compatible with any standard drill chuck or collet accepting a 12.00 mm straight-cylindrical shank. Rated for use in ISO material groups P, M, K, and N, covering carbon and alloy steels, stainless steels, cast irons, and aluminum and non-ferrous alloys.

Installation Notes

A licensed machinist or qualified maintenance technician should install and operate this bit in appropriate drilling equipment. Secure the straight shank fully in a keyed or keyless chuck before operation and verify runout before drilling production workpieces. Power down or de-energize the drilling machine and allow the spindle to come to a complete stop before changing bits. Do not exceed the rated maximum drilling depth of 3.9764 inches in a single pass without retracting to clear chips.