Precision Twist Drill 5999424 Jobber Drill Bit No 43

Product Description

The PRECISION TWIST DRILL 5999424 is a jobber-length drill bit sized to wire gauge No. 43 (0.0890 inches decimal), designed for general-purpose drilling in metal and hard materials. Built from high speed steel with a steam oxide coating, it offers solid wear resistance for production and maintenance drilling operations. The 118-degree standard point angle suits a broad range of ferrous and non-ferrous materials. With an overall length of 2.25 inches and a 1.25-inch flute length, this bit fits standard drill chucks and is a working tool for machinists, maintenance techs, and fabricators who need a reliable small-diameter bit.

This bit is rated for use in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It carries NAS 907 specification and meets ANSI standards, making it appropriate for aerospace-adjacent maintenance work and general metalworking. The straight-cylindrical shank at 0.0890 inches diameter seats directly in standard keyless or keyed drill chucks without adapters. It is suited to bench drill presses, hand drills, and CNC drilling operations where a wire-gauge size is specified by print or fastener specification.

Key Features

• Wire gauge No. 43 size — 0.0890 inches decimal diameter for precise small-hole drilling
• 118-degree standard point angle for versatile use across ferrous and non-ferrous materials
• Steam oxide coating reduces friction and provides moderate corrosion resistance
• 2-flute regular spiral flute design with web-thinned, tapered web for improved chip evacuation
• NAS 907 specification and ANSI standards compliance
• 14xD flute-to-diameter ratio with 1.25-inch maximum drilling depth

Compatibility

Part of the PRECISION TWIST DRILL R10A, R15A, and R18A series. Fits any standard drill chuck accepting a 0.0890-inch straight-cylindrical shank. Compatible workpiece materials include steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium as noted in the product specifications.

Installation Notes

Install and replace drill bits with the machine fully powered down and the chuck key removed from the work area. Secure the shank fully in the chuck jaws before tightening to prevent runout. Use appropriate cutting fluid or lubricant when drilling stainless steel, superalloys, or titanium to extend tool life and protect the workpiece. Dispose of worn or chipped bits according to shop safety procedures — do not attempt to regrind without proper equipment.