Precision Twist Drill 6000743 Cobalt Jobber Drill 5.70mm

Product Description

The PRECISION TWIST DRILL 6000743 is a cobalt high-speed steel jobber-length drill bit designed for general-purpose drilling in steel and other demanding materials. Ground to a 135-degree split point with web thinning, it starts on contact without a center punch and reduces walking on hard surfaces. The straight cylindrical shank measures 5.70 mm (0.2244 inches) in diameter and fits standard drill chucks. An oxide and straw coating provides lubricity and heat resistance during extended drilling cycles. At 3-21/32 inches overall length with a 2-1/4 inch flute length, the 6000743 is a practical daily-use bit for fabricators, machinists, and maintenance technicians.

This jobber drill is suited for production and maintenance drilling in ferrous metals, stainless steel, cast iron, aluminum, and non-ferrous alloys. The DIN 338 specification and ANSI standard compliance make it a direct fit wherever metric jobber geometry is specified. Typical applications include structural steel fabrication, sheet metal work, and general machine shop operations requiring a 5.70 mm hole in a wide range of workpiece materials including steel, cast materials, and light alloys.

Key Features

• Cobalt HSS construction for improved heat resistance and hardness in steel drilling
• 135-degree split point with web thinning for self-centering starts and reduced thrust
• Oxide and straw coating reduces friction and extends cutting life
• Regular spiral, 2-flute design promotes efficient chip evacuation
• Straight cylindrical shank fits standard 3-jaw and keyless drill chucks
• DIN 338 specification with ANSI compliance for consistent geometry

Compatibility

Designed for use in standard drill chucks accepting a 5.70 mm (0.2244 inch) straight shank. Rated for primary workpiece material codes P, M, K, N, and S covering steel, stainless, cast iron, non-ferrous metals, and special alloys per ISO material classification.

Installation Notes

Secure the shank fully in the chuck and confirm runout before drilling. A licensed machinist or qualified technician should set appropriate feed and speed rates for the workpiece material to avoid overheating the cutting edge. Do not use excessive feed pressure; let the split point geometry do the work. Eye protection and chip guards are required per standard shop safety practice.