Precision Twist Drill 5997035 Jobber Drill Bit No 8 Hss

Product Description

The PRECISION TWIST DRILL 5997035 is a jobber-length drill bit in No. 8 wire size (0.1990 inches decimal equivalent), made from high speed steel with a bright uncoated finish. It features a 135-degree split point and a parabolic spiral flute design with web thinning, which reduces walking on entry and lowers the thrust force needed to start a hole. Overall length is 3.625 inches with a flute length of 2.4375 inches. The straight cylindrical shank measures 0.1990 inches in diameter. This bit is a general-purpose, heavy-duty grade tool suited for production drilling and maintenance work performed by machinists and skilled tradespeople.

The 5997035 is designed for drilling into a broad range of workpiece materials including steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. Its 12xD flute-to-diameter ratio and tapered web configuration make it effective in both handheld drill and drill press applications. The Series QC21P designation places it in a line built to ANSI standards for consistent geometry across the production run. It is equally at home on a shop floor, a fabrication bench, or a field service application where a reliable wire-gauge bit is needed.

Key Features

• No. 8 wire size — 0.1990 inches decimal equivalent for precise gauge-matched hole sizing
• 135-degree split point with web thinning reduces walking and lowers entry thrust
• High speed steel construction rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Parabolic spiral flute with tapered web improves chip evacuation in deeper holes
• Straight cylindrical shank compatible with standard drill chucks — no flat or drive notch
• Built to ANSI standards under Series QC21P for consistent dimensional tolerances

Compatibility

Designed as an OEM-style jobber-length drill bit for use in any standard drill chuck accepting a 0.1990-inch straight cylindrical shank, including benchtop drill presses, CNC drilling stations, and handheld power drills used in metal fabrication and maintenance trades.

Installation Notes

Install in a properly sized drill chuck and tighten with a chuck key before operation. Ensure the workpiece is securely clamped before drilling to prevent rotation or movement. For steel and stainless steel applications, use an appropriate cutting fluid to extend tool life and improve hole finish. Disconnect power to the drill press or deactivate the machine before changing bits.