Precision Twist Drill 5999614 Jobber Drill 1.05mm Cobalt

Product Description

The PRECISION TWIST DRILL 5999614 is a cobalt high-speed steel jobber-length drill bit designed for drilling steel and other demanding workpiece materials. It features a 135-degree split point with web thinning for fast penetration and reduced walking at entry. The 1.05 mm diameter and straight cylindrical shank suit standard drill chucks across benchtop drill presses, hand drills, and CNC drilling setups. With a straw oxide finish and tapered web configuration, this bit is built for general-purpose heavy-duty drilling in metalworking, fabrication, and maintenance environments. Machinists and tool-and-die technicians are the primary users.

This bit is suited for drilling ferrous metals including steel, cast iron, and stainless, as well as aluminum and non-ferrous alloys. The Series 2ACO designation places it in a line built to DIN 338 and ANSI standards, making it a direct fit for applications requiring close-tolerance small-diameter drilling. The 11xD flute-to-diameter ratio provides adequate chip clearance even in deep-entry work relative to the bit size. Typical applications include precision hole placement in sheet metal, machined components, and tool fixtures.

Key Features

• Cobalt high-speed steel construction for heat resistance in steel drilling
• 135-degree split point with web thinning reduces thrust and self-centers on entry
• Straw oxide finish provides lubricity and mild corrosion resistance
• Regular spiral flute with tapered web for efficient chip evacuation
• Straight cylindrical shank fits standard drill chucks without adapters
• Meets DIN 338 and ANSI standards for consistent dimensional tolerancing

Compatibility

Designed as a general-purpose replacement or stock jobber drill bit for any drill chuck accepting a 1.05 mm straight shank. Compatible with primary workpiece material codes P, M, K, N, and S per DIN classification, covering steel, stainless, cast iron, aluminum, and heat-resistant alloys.

Installation Notes

Installed by machinists, tool-and-die workers, and maintenance technicians using standard drill chucks. Ensure the workpiece is secured before beginning any drilling operation. At this diameter, low feed pressure and appropriate RPM selection are critical to avoid bit breakage. No coolant-through capability is present on this bit, so external cutting fluid or oil is recommended when drilling hardened or stainless steel.