Precision Twist Drill 5999708 Cobalt Jobber Drill 10.80mm

Product Description

The PRECISION TWIST DRILL 5999708 is a cobalt jobber-length drill bit designed for production and maintenance drilling in steel, cast iron, aluminum, and high-temperature alloys. Built to DIN 338 and ANSI standards, it carries a 10.80 mm (0.4252 inch) diameter with a 135-degree split-point geometry that self-centers on contact and reduces the need for a center punch. The oxide and straw finish lowers friction and provides light corrosion resistance during storage. Web-thinned construction reduces thrust load, making it well suited for hand-held drill motors and drill press work in heavy-duty general-purpose applications.

This bit is intended for right-hand rotation drilling in steel and ferrous metals as well as non-ferrous materials and some high-temp alloys. The straight cylindrical shank seats directly in standard three-jaw chucks without an adapter. Machinists, maintenance technicians, and fabricators reach for this size when drilling through structural steel, plate stock, and equipment housings where a reliable, consistent hole diameter is required. It is sold individually and is appropriate for both shop and field use.

Key Features

• Cobalt construction for improved heat and wear resistance over standard HSS in steel applications
• 135-degree split-point tip self-centers and reduces walking on flat surfaces
• Web-thinned, tapered web lowers axial thrust for easier drilling and longer tool life
• Oxide and straw coating reduces friction and provides light corrosion protection
• Regular spiral flute with 9xD flute-to-diameter ratio for efficient chip evacuation
• Straight cylindrical shank fits standard drill chucks with no adapter required
• Meets DIN 338 and ANSI standards for consistent dimensional accuracy

Compatibility

Designed as a general-purpose jobber drill bit compatible with any standard three-jaw chuck or drill press spindle accepting a straight shank of 10.80 mm (0.4252 inch) diameter. Rated for use in steel, cast iron, aluminum, non-ferrous metals, and high-temperature alloys per workpiece material codes P, M, K, N, and S.

Installation Notes

Installation and use should be performed by machinists or qualified maintenance technicians familiar with proper drill press or hand-drill operating procedures. Secure the workpiece before drilling and confirm chuck jaws are fully tightened on the shank before operation. Apply cutting fluid or coolant appropriate for the workpiece material to extend tool life, particularly when drilling hardened or stainless steel. Do not run the bit in reverse, as this dulls the cutting edges rapidly.