Precision Twist Drill 6000731 Cobalt Jobber Drill 12.50mm

Product Description

The PRECISION TWIST DRILL 6000731 is a cobalt high-speed steel jobber-length drill bit built for heavy-duty drilling in ferrous and non-ferrous metals. The 12.50 mm (0.4921 inch) diameter bit features a 135-degree split point for fast penetration and reduced walking on entry. An oxide and bronze straw coating extends surface hardness and provides light lubricity during cutting. With an overall length of 5.9375 inches and a flute length of 3.9688 inches, this bit suits standard drill press and hand-drill applications. The web-thinned, tapered-web design reduces thrust requirements. Licensed tradespeople and machining professionals are the primary users.

This jobber drill is suited for general-purpose drilling in steel, stainless, cast iron, aluminum, and other materials consistent with workpiece material codes P, M, K, N, and S under DIN 338 classification. The 8xD flute-to-diameter ratio makes it a practical choice for production drilling on mills, drill presses, and hand-held power tools where a straight-cylindrical shank is required. It is well matched to fabrication shops, mechanical contractors, and maintenance technicians who need a reliable general-purpose bit for everyday metal drilling tasks.

Key Features

• 12.50 mm cobalt construction for added heat and wear resistance in tough materials
• 135-degree split point reduces thrust and minimizes bit walking on hard surfaces
• Oxide and bronze straw coating extends tool life under dry or lightly lubricated cutting
• Web-thinned tapered web lowers cutting resistance and improves chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters
• Right-hand spiral flute with regular helix angle suits a wide range of workpiece materials

Compatibility

Designed as a general-purpose jobber-length drill bit conforming to DIN 338 and ANSI standards, fitting any standard drill chuck that accepts a 0.4921-inch (12.50 mm) straight shank.

Installation Notes

Installation is performed by machinists, maintenance technicians, or mechanical contractors using a drill press, milling machine, or hand-held power drill with an appropriately sized chuck. Secure the shank fully in the chuck and confirm runout before beginning a cut. Use cutting fluid or coolant when drilling steel to extend tool life, particularly on deep holes approaching the maximum drilling depth of 3.9764 inches. Inspect the cutting edges before each use and replace the bit if chipping or heat discoloration is observed at the point.