Precision Twist Drill 5997737 Cobalt Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5997737 is a cobalt jobber-length drill bit designed for heavy-duty drilling in steel and other demanding workpiece materials. Sized to wire gauge No. 50, it measures 0.0700 inches in diameter with a 2-inch overall length. The 135-degree split point reduces walking on entry and cuts through hard alloys with less thrust than a conventional 118-degree point. A straw oxide finish improves surface hardness and heat resistance during high-speed cutting. This bit is built for shop machinists, maintenance technicians, and metalworking tradespeople who need reliable performance on ferrous and non-ferrous substrates.

The 5997737 is suited for general-purpose drilling in production and maintenance environments. It handles primary workpiece material codes P, M, K, N, and S, covering carbon steel, stainless steel, cast iron, non-ferrous metals, and heat-resistant alloys. The 1-inch flute length supports drilling to a maximum depth of 1 inch. With a straight cylindrical shank measuring 0.0700 inches in diameter, it seats directly in standard drill chucks and collets without adapters. It is a practical choice wherever a small-diameter, high-strength bit is required.

Key Features

• Cobalt high-speed steel construction for heat resistance and extended tool life in hard materials
• 135-degree web-thinned split point reduces thrust and minimizes bit walking on entry
• Straw oxide coating improves surface hardness and reduces friction during cutting
• Regular spiral flute with 14xD flute-to-diameter ratio supports efficient chip evacuation
• Straight cylindrical shank fits standard drill chucks and collets without modification
• Meets ANSI and NAS 907 standards for dimensional and performance consistency

Compatibility

Part of the R10CO-R15CO-R18CO series. Designed as an OEM-style replacement or direct substitute for wire gauge No. 50 cobalt jobber drill bits in that series where ANSI and NAS 907 compliance is required.

Installation Notes

Install in a compatible drill press, CNC machine, or hand drill with a chuck rated for the 0.0700-inch shank diameter. Confirm the workpiece is securely clamped before drilling to prevent rotation and tool breakage. Use appropriate cutting fluid for ferrous materials to prolong tool life and maintain hole quality. Inspect the cutting edges for wear before each use, particularly when drilling hardened or abrasive alloys.