Precision Twist Drill 6000639 Cobalt Jobber Drill 2.50mm

Product Description

The PRECISION TWIST DRILL 6000639 is a cobalt jobber-length drill bit designed for production and maintenance drilling in steel and other ferrous and non-ferrous materials. The bit measures 2.50 mm (0.0984 inches) in diameter with an overall length of 57.00 mm (2.25 inches) and a flute length of 30.00 mm (1.1875 inches). The 135-degree split point reduces walking on entry and lowers thrust requirements compared to a standard 118-degree point. An oxide and straw finish provides mild lubricity and corrosion resistance during operation. This is a heavy-duty, general-purpose bit suited for use by machinists, maintenance technicians, and trade professionals drilling metal substrates.

This bit is well suited for drilling steel, cast iron, aluminum, non-ferrous alloys, and specialty alloys in both shop and field environments. The 12xD flute-to-diameter ratio is consistent with standard jobber-length geometry, making it appropriate for a wide range of benchtop drill presses, hand drills, and CNC drilling operations. The regular spiral flute type provides efficient chip evacuation in through-hole and blind-hole applications. It conforms to DIN 338 and ANSI standards, making it a direct fit for tooling setups that require dimensionally standardized drill stock.

Key Features

• Cobalt construction for improved heat and wear resistance when drilling hard steels
• 135-degree web-thinned split point reduces entry walking and lowers required thrust
• Oxide and straw finish adds lubricity and mild corrosion resistance
• Regular spiral flute with tapered web configuration promotes reliable chip evacuation
• Straight cylindrical shank fits standard drill chucks without adapters
• Conforms to DIN 338 and ANSI dimensional standards

Compatibility

Designed as a general-purpose jobber drill bit compatible with standard three-jaw drill chucks accepting straight shanks at 2.50 mm (0.0984 inches) shank diameter. Suitable for use in hand drills, drill presses, and CNC equipment configured for straight-shank tooling.

Installation Notes

Install and remove the bit only with the drilling equipment powered off and fully stopped. Secure the straight shank in a properly sized drill chuck and tighten with a chuck key before operation. Appropriate cutting fluid or coolant is recommended when drilling ferrous metals to extend bit life, even though this bit does not support through-tool coolant delivery. Follow applicable shop safety practices and equipment manufacturer guidelines when selecting feed rate and spindle speed for the workpiece material.