Precision Twist Drill 5997643 Jobber Drill Bit 43

Product Description

The PRECISION TWIST DRILL 5997643 is a jobber-length drill bit designed for general-purpose drilling in metal fabrication, maintenance, and production environments. Ground from high-speed steel with a steam oxide coating, this bit runs at a wire gauge size of 43, equivalent to 0.0890 inches in decimal. The 135-degree split point reduces walking on hard surfaces and lowers thrust requirements at entry. Overall length is 2.25 inches with a 1.25-inch flute length. The straight-cylindrical shank measures 0.0890 inches in diameter, making it compatible with standard drill chucks. Licensed machinists, tool-and-die technicians, and field maintenance pros are the primary users of this bit.

This bit is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium in both shop and field settings. It performs in hand-held power drills, drill presses, and CNC drilling operations where a wire-gauge bit is specified. The regular spiral geometry and tapered web configuration support chip evacuation in through-hole and blind-hole applications. The 14xD flute-to-diameter ratio accommodates moderate drilling depths within the 1.25-inch maximum drilling depth capacity. Series R18B designation places it within the R10B-R15B-R18B product family, a lineage built to ANSI and NAS 907 specifications for heavy-duty drilling applications.

Key Features

• Wire size 43 (0.0890 inches decimal) straight-cylindrical shank for standard chuck compatibility
• 135-degree point angle reduces entry walking and lowers thrust on hard workpiece materials
• Steam oxide coating improves lubricity and provides light corrosion resistance during storage
• High-speed steel construction with web-thinned, tapered web for reduced cutting resistance
• Two-flute regular spiral geometry supports chip evacuation in steel and non-ferrous applications
• Meets ANSI standards and NAS 907 specification for heavy-duty general-purpose drilling

Compatibility

Designed as a general-purpose jobber-length drill bit for use in standard drill chucks and drill press spindles accepting a 0.0890-inch straight-cylindrical shank. Rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium workpiece materials per the NAS 907 specification.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with drill press and rotary tool operation. Secure the workpiece firmly and confirm chuck grip on the full shank length before beginning a cut. Power down and de-energize any drilling equipment before changing or inspecting bits. Do not exceed the rated maximum drilling depth of 1.25 inches without retracting to clear chips.