Precision Twist Drill 5999089 Jobber Drill Bit Wire 20

Product Description

The PRECISION TWIST DRILL 5999089 is a jobber-length drill bit sized to wire gauge 20 (0.1610 inches diameter) for general-purpose drilling in metalworking applications. Built from high speed steel with a steam oxide coating, this bit features a 135-degree split-point tip that reduces walking on hard surfaces and lowers thrust requirements at the start of a hole. The spiral flute geometry is a regular helix with a tapered web and web-thinned point, suited for consistent chip evacuation. Overall length is 3.25 inches with a flute length of 2.125 inches, making it a standard jobber proportion for hand-drill, drill press, and CNC applications. It is sold individually and must be ordered in multiples of 12.

This bit is designed for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. The steam oxide finish provides mild lubricity and corrosion resistance during storage and use. It conforms to NAS 907 and ANSI standards, placing it in the heavy-duty grade category appropriate for production and maintenance drilling environments. Machinists, tool-and-die technicians, HVAC fabricators, and general metalworking tradespeople are the primary users. The straight-cylindrical shank fits standard drill chucks without adapters.

Key Features

• Wire size 20 (0.1610 inches) straight-cylindrical shank for direct chuck mounting
• 135-degree standard split point reduces bit walking and entry thrust on hard materials
• Steam oxide coating adds mild lubricity and protects against corrosion during storage
• Regular spiral flute with tapered, web-thinned geometry for efficient chip evacuation
• Rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Meets NAS 907 and ANSI standards at heavy-duty grade

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard drill chuck accepting a 0.1610-inch straight-cylindrical shank, including hand drills, drill presses, and CNC machining centers. No coolant-through capability; dry or flood-coolant external application only.

Installation Notes

Installation is performed by machinists or qualified tradespeople using a standard keyed or keyless chuck. Secure the shank fully in the chuck before applying power and confirm the bit runs true before contact with the workpiece. Maximum drilling depth for this bit is 2.125 inches; do not exceed this depth in a single pass without retracting to clear chips. Always wear appropriate eye protection and follow shop safety protocols when operating drilling equipment.