Precision Twist Drill 5999689 Cobalt Jobber Drill 1.90mm

Product Description

The PRECISION TWIST DRILL 5999689 is a cobalt high-speed steel jobber-length drill bit engineered for general-purpose drilling in steel and other demanding workpiece materials. Built to DIN 338 and ANSI standards, it features a 135-degree split point with web thinning for reduced thrust and self-centering entry without a center punch. The 1.90 mm diameter straight shank and regular spiral flute geometry make it a reliable choice for production environments and tool rooms where consistent hole quality and bit longevity in ferrous materials are priorities. The oxide and straw finish reduces friction and provides basic corrosion resistance during storage and use.

This bit is suited for drilling steel, cast iron, non-ferrous metals, and similar materials in both light-duty shop work and heavier production drilling applications. The 12xD flute-to-diameter ratio and tapered web configuration support chip evacuation in through-hole and shallow blind-hole operations. It is commonly used by machinists, tool-and-die workers, and maintenance technicians working with drill presses, CNC machines, and hand-held power drills requiring a straight-shank bit in the sub-2 mm range.

Key Features

• Cobalt HSS construction for improved heat resistance and extended tool life in steel and hard alloys
• 135-degree split point with web thinning reduces walking and lowers required feed force
• DIN 338 and ANSI compliant jobber-length geometry for consistent fitment in standard chucks
• Oxide and straw coating reduces friction and provides surface protection
• Right-hand cutting, regular spiral flute for efficient chip removal
• Straight cylindrical shank compatible with standard drill chucks and collets

Compatibility

Designed as a general-purpose jobber drill bit for use in standard drill chucks and collets accepting a 1.90 mm straight cylindrical shank, suitable for workpiece materials coded P, M, K, N, and S per ISO material classification.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance technicians familiar with proper chuck tightening and feed-rate selection for small-diameter bits. Secure the shank fully in the chuck before operation to prevent runout and bit breakage. At sub-2 mm diameters, excessive feed pressure is the primary cause of breakage — use appropriate low-feed settings and cutting fluid where the workpiece material warrants it. Inspect the cutting edges for chipping before each use.