Precision Twist Drill 6000551 Cobalt Jobber Drill 7.80mm

Product Description

The PRECISION TWIST DRILL 6000551 is a cobalt high-speed steel jobber-length drill bit designed for production and maintenance drilling in steel, cast iron, non-ferrous metals, and high-temp alloys. The 135-degree split point reduces walking and decreases thrust force at entry, making it a reliable choice for hand-fed and machine-fed applications alike. At 4-39/64 inches overall length with a 2-61/64 inch flute length, this is a standard jobber format that fits most drill chucks and CNC setups without modification. The straw oxide finish improves lubricity and provides a degree of corrosion resistance during storage and use. Web thinning at the tip further reduces cutting resistance on harder workpiece materials.

This bit is suited for general-purpose drilling in steel and similar metals in fabrication shops, maintenance facilities, and light manufacturing environments. The straight cylindrical shank with no flats accepts standard three-jaw drill chucks. It conforms to DIN 338 geometry and meets ANSI standards, making it compatible with tooling setups that require specification-grade tooling. Typical applications include through-hole and blind-hole drilling in structural steel, mild steel plate, and similar P, M, K, N, and S material code workpieces as classified under ISO tool material designation.

Key Features

• Cobalt HSS construction for improved heat and wear resistance in steel drilling
• 135-degree split point reduces bit walking and lowers required feed force
• Straw oxide finish adds lubricity and corrosion resistance
• Web-thinned, tapered web configuration reduces cutting torque
• DIN 338 specification with ANSI compliance for consistent geometry
• Right-hand, regular spiral flute with 10xD flute-to-diameter ratio for effective chip evacuation

Compatibility

Designed as a general-purpose OEM-style jobber drill for use in standard three-jaw drill chucks and CNC drilling applications across P, M, K, N, and S material categories per ISO workpiece classification.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with drill press, mill, or CNC equipment. Secure the workpiece firmly before drilling and ensure the drill chuck is fully tightened to the rated torque for the chuck model in use. Use appropriate cutting fluid or coolant for steel drilling to extend tool life; this bit does not support through-coolant delivery. Inspect the cutting edges and web thinning before each use and replace the bit if chipping or wear is observed.