Precision Twist Drill 6000739 Cobalt Jobber Drill 5.50mm

Product Description

The PRECISION TWIST DRILL 6000739 is a cobalt high-speed steel jobber-length drill bit designed for drilling steel and other ferrous and non-ferrous materials in production and maintenance environments. The 5.50 mm (0.2165 inch) diameter bit features a 135-degree split-point geometry with web thinning, which reduces walking and lowers thrust required at entry. An oxide and straw finish provides light lubricity and corrosion resistance during cutting. The straight cylindrical shank measures 5.5 mm in diameter and seats directly in standard drill chucks and collets. This bit is built to DIN 338 and ANSI standards and is suited for machinists, tool and die technicians, and maintenance mechanics running general-purpose hole-making operations.

This bit is rated for drilling steel, stainless, cast iron, aluminum, non-ferrous metals, and certain superalloys, as indicated by the P, M, K, N, and S workpiece material codes. The 2ACO series targets heavy-duty general-purpose applications across job shop, production floor, and field maintenance scenarios. With a flute length of 2.25 inches and an overall length of 3.6563 inches (3-21/32 inches), it fits standard benchtop drill presses, handheld power drills, and CNC machining centers with appropriate toolholding. The 10xD flute-to-diameter ratio supports chip evacuation in moderate-depth holes without parabolic geometry.

Key Features

• Cobalt HSS construction for elevated heat resistance in steel and hard-material drilling
• 135-degree split point with web thinning reduces thrust and self-centers on entry
• Oxide and straw coating provides light lubricity and surface protection
• DIN 338 and ANSI compliant for consistent dimensional standards
• Straight cylindrical shank fits standard chucks and collets without adapters
• Right-hand cut, regular spiral flute for reliable chip clearance in through and blind holes

Compatibility

Designed for use in standard drill chucks and collets accepting a 5.5 mm straight shank. Rated for workpiece materials coded P, M, K, N, and S, covering carbon steel, stainless steel, cast iron, aluminum alloys, and superalloys per ISO material classification.

Installation Notes

Install and removal should be performed with the drill press or driver fully de-energized and the chuck key removed from the chuck before powering on. Secure the workpiece firmly before drilling to prevent rotation. Use cutting fluid or coolant appropriate to the workpiece material to extend tool life; this bit does not support coolant-through delivery. Follow applicable OSHA machine guarding and PPE requirements for drilling operations.