Precision Twist Drill 5997776 No. 60 Cobalt Jobber Drill

Product Description

The PRECISION TWIST DRILL 5997776 is a No. 60 wire-gauge cobalt jobber drill bit built for heavy-duty drilling in ferrous and non-ferrous metals. It measures 0.0400 inches in diameter with an overall length of 1.625 inches and a flute length of 0.6875 inches. The 135-degree split point reduces walking on entry and requires less feed pressure than a standard 118-degree grind. An oxide and straw finish provides mild lubrication and corrosion resistance during cutting. This bit is sized for precision work and is typically installed by machinists, maintenance technicians, and metalworking tradespeople who need consistent, repeatable hole quality in small-diameter applications.

This jobber drill is suited for production and maintenance drilling in steel, cast iron, aluminum, copper, and other materials covered under material codes P, M, K, N, and S. The 17xD flute-to-diameter ratio and tapered web configuration make it appropriate for through-hole and blind-hole drilling in thin stock, sheet metal, and small machined components. It belongs to the R10CO-R15CO-R18CO series from Precision Twist Drill, which is designed around NAS 907 and ANSI standards for consistent geometry across the series.

Key Features

• No. 60 wire gauge diameter: 0.0400 inches for tight-tolerance small-hole work
• Cobalt high-speed steel construction rated as heavy-duty grade for improved heat and wear resistance
• 135-degree split point with web thinning reduces thrust and minimizes bit walk on hard surfaces
• Oxide and straw coating provides light lubrication and surface protection
• Regular spiral, right-hand cutting flutes with tapered web for efficient chip evacuation
• Straight cylindrical shank at 0.0400 inches diameter fits standard keyless and keyed drill chucks
• Meets NAS 907 and ANSI dimensional standards

Compatibility

Part of the PRECISION TWIST DRILL R10CO-R15CO-R18CO series. Designed as a general-purpose cobalt jobber drill for use in standard drill chucks and CNC drilling applications requiring a No. 60 wire-gauge hole in metal workpieces.

Installation Notes

This bit is installed by machinists and maintenance technicians using standard drill presses, CNC machining centers, or hand-held power drills with a compatible chuck. Secure the workpiece before drilling and confirm the chuck is fully tightened on the straight shank. When drilling steel or hard alloys, use a cutting fluid to extend bit life and maintain hole quality. At 0.0400 inches diameter, avoid excessive lateral force, which can snap the bit.