Precision Twist Drill 5997810 Cobalt Jobber Drill No 7

Product Description

The PRECISION TWIST DRILL 5997810 is a No. 7 wire-size cobalt jobber-length drill bit designed for production drilling in steel and other demanding workpiece materials. The bit measures 0.2010 inches in diameter with an overall length of 3.625 inches and a flute length of 2.4375 inches, giving it a 12xD flute-to-diameter ratio typical of jobber-series tooling. The 135-degree split-point geometry with web thinning reduces entry thrust and self-centers on the workpiece without a center punch in most setups. A straw oxide finish provides mild lubricity and heat resistance during high-speed cutting cycles. This bit is rated heavy-duty and meets ANSI and NAS 907 standards, making it a reliable choice for maintenance shops, fabrication floors, and production lines.

This bit is suited for right-hand drilling operations in steel, cast iron, non-ferrous alloys, and high-temperature alloys consistent with workpiece material codes P, M, K, N, and S. The straight cylindrical shank at 0.2010 inches diameter seats directly in standard drill chucks without adapters, making it compatible with handheld drills, drill presses, and CNC machining centers. The regular spiral flute design evacuates chips efficiently in through-hole and blind-hole applications. Maximum drilling depth matches the flute length at 2.4375 inches. The bit belongs to the R10CO-R15CO-R18CO series from Precision Twist Drill, covering cobalt jobber-length tooling in this size range.

Key Features

• No. 7 wire size — 0.2010 inches diameter — straight cylindrical shank for universal chuck compatibility
• Cobalt high-speed steel construction for elevated heat resistance and longer tool life in ferrous materials
• 135-degree split point with web thinning reduces thrust and improves self-centering on entry
• Straw oxide finish provides baseline lubricity and corrosion resistance during storage and use
• Tapered web with regular spiral flutes promotes consistent chip evacuation in steel and alloy workpieces
• Meets ANSI and NAS 907 specifications — suitable for aerospace and industrial maintenance applications

Compatibility

Designed for right-hand drilling in steel, cast iron, non-ferrous metals, and high-temperature alloys (material codes P, M, K, N, S). Part of the Precision Twist Drill R10CO-R15CO-R18CO cobalt jobber series. Fits any standard drill chuck accepting a 0.2010-inch straight shank.

Installation Notes

Installation and use of this drill bit should be performed by machinists or qualified tradespeople familiar with rotating cutting tools. Secure the straight shank firmly in the drill chuck before operation and verify runout is within acceptable limits for the application. Always wear appropriate eye protection and ensure workpieces are clamped securely before drilling. Do not exceed the recommended feed and speed parameters for the workpiece material and machine type in use.