Precision Twist Drill 5997991 Jobber Drill Bit 43

Product Description

The PRECISION TWIST DRILL 5997991 is a jobber-length twist drill bit designed for general-purpose drilling in metal and alloy workpieces. Sized at wire gauge 43 (0.0890 inches decimal), it is ground from high speed steel with a bright, uncoated finish. The standard 118-degree split point and web-thinned tip promote accurate entry and reduce walking on flat surfaces. Overall length is 2.25 inches with a 1.25-inch spiral flute. The straight cylindrical shank seats directly in standard drill chucks without an adapter. This bit is used by machinists, maintenance technicians, pipefitters, and HVAC sheet metal mechanics for production and maintenance drilling operations.

This drill bit is suited for drilling steel, cast iron, non-ferrous metals, superalloys, and titanium in both production and maintenance settings. Its jobber-length geometry balances rigidity with reach, making it appropriate for handheld drill motors, drill presses, and CNC drilling operations where a wire-gauge size is specified. The regular spiral flute promotes chip evacuation in through-hole and blind-hole applications. Maximum drilling depth is 1.25 inches per the flute length.

Key Features

• Wire size 43, 0.0890 inches decimal diameter for precise gauge-size holes
• 118-degree standard point angle with web-thinned tip for clean entry
• High speed steel construction rated for steel, cast iron, non-ferrous metals, superalloys, and titanium
• Bright uncoated finish — no coating buildup to alter diameter tolerance
• Regular spiral, 2-flute design with tapered web for consistent chip clearance
• Straight cylindrical shank compatible with standard drill chucks
• Conforms to ANSI standards, Series R10H-R18H

Compatibility

Designed as a general-purpose jobber-length drill bit for use in standard drill chucks accepting a 0.0890-inch straight cylindrical shank. Suitable for handheld and stationary drilling equipment across production and field maintenance applications.

Installation Notes

Installation and use of this drill bit should be performed by qualified tradespeople familiar with rotating cutting tools and machine safety. Secure the workpiece fully before drilling and ensure the chuck is tightened on the shank before operation. Disconnect or de-energize the drill motor before changing bits. Do not exceed the rated maximum drilling depth of 1.25 inches in a single pass without backing out to clear chips.