Precision Twist Drill 5997199 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5997199 is a taper length drill bit in the QC91P series, designed for heavy-duty general-purpose drilling across a wide range of metal and non-ferrous materials. It measures 1/8 inch (0.1250 inch decimal) in diameter with a 135-degree split point that reduces walking on entry and lowers the thrust needed to start a hole. The parabolic flute geometry — at a 6xD flute-to-diameter ratio and 2-3/4 inches of flute length — promotes efficient chip evacuation during deep drilling operations. The bit is manufactured from high-speed steel with a bright/uncoated finish and is used by machinists, maintenance technicians, and metalworking professionals.

This bit is suited for drilling into a broad range of workpiece materials in both production and repair environments. The straight shank fits standard drill chucks without adapters. The taper length body gives more reach than a jobber bit while keeping rigidity. It is well matched to drill press, hand drill, and CNC drilling applications where a 1/8-inch diameter hole is required in metal, alloy, or composite stock.

Key Features

• 135-degree split point for self-centering entry and reduced thrust requirement
• Parabolic flute design at 6xD ratio promotes fast chip evacuation in deep holes
• High-speed steel construction handles heat generated in heavy-duty drilling cycles
• Web-thinned, tapered web configuration reduces cutting resistance
• Bright/uncoated finish — no coating buildup to affect dimensional tolerances
• Straight, non-threaded shank fits standard drill chucks directly
• ANSI standard compliance for dimensional consistency

Compatibility

Rated for use in alloy steel, aluminum, aluminum alloy, brass, bronze, carbon steel, cast iron, copper, graphite, hardened steel, magnesium, magnesium alloy, malleable iron, nickel, stainless steel, steel, tempered steel, titanium, and titanium alloy workpieces. Fits any standard drill chuck accepting a 0.1250-inch straight shank.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or maintenance technicians familiar with drilling equipment and safe machine operation. Always secure the workpiece properly and power down the drill before changing bits. Verify chuck capacity accepts a 0.1250-inch shank before installing. Use appropriate cutting fluid for ferrous materials to extend bit life and maintain hole quality.