Precision Twist Drill 6000598 Cobalt Jobber Drill 9.80mm

Product Description

The PRECISION TWIST DRILL 6000598 is a cobalt high-speed steel jobber-length drill bit designed for production and maintenance drilling in steel and other demanding workpiece materials. It measures 9.80 mm (0.3858 inches) in diameter with an overall length of 5-15/64 inches (5.2344 inches) and a flute length of 3-27/64 inches (3.4219 inches). The 135-degree split point reduces walking and allows drilling to start without a center punch in most setups. An oxide and straw finish provides light lubricity and corrosion resistance during service. This bit is suited for machinists, tool-and-die shops, and maintenance technicians running hand-held or machine-spindle operations.

This jobber drill is built for general-purpose through-hole and blind-hole drilling in ferrous and non-ferrous materials. The 9xD flute-to-diameter ratio provides adequate chip evacuation in typical depth applications. With a straight cylindrical shank at 9.80 mm (0.3858 inches), it seats directly in standard keyless or keyed drill chucks without an adapter. Primary workpiece material classifications include steel, stainless, cast iron, non-ferrous, and heat-resistant alloys (P, M, K, N, S codes per ISO material grouping). The two-flute regular spiral geometry handles a broad range of shop materials without requiring specialized toolpaths.

Key Features

• Cobalt HSS construction for elevated heat resistance in tough ferrous and exotic-alloy drilling
• 135-degree split point reduces thrust force and minimizes bit walk on entry
• Oxide and straw coating adds surface lubricity and light corrosion protection
• Web-thinned, tapered web design improves chip clearance and reduces cutting torque
• Straight cylindrical shank fits standard drill chucks without adapters
• Conforms to DIN 338 and ANSI standards for dimensional consistency

Compatibility

Designed as a general-purpose jobber drill for use in standard drill chucks accepting a 9.80 mm straight shank. Suitable for bench-top drill presses, CNC machining centers, and hand-held drills where a 3/8-inch-class chuck is in use.

Installation Notes

Secure the shank fully into the chuck and verify runout before beginning the cut. Ensure the workpiece is clamped or fixtured to prevent rotation. Apply cutting fluid appropriate to the workpiece material to extend tool life, particularly when drilling stainless or alloy steel. Inspect the cutting edges for wear or chipping before each use and replace if the point geometry is compromised.