Precision Twist Drill 5999189 Jobber Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5999189 is a jobber-length drill bit designed for general-purpose drilling in metalworking applications. It measures 0.016 inches in diameter, corresponding to wire gauge size 78, and features a 118-degree standard point angle suited for drilling into cast iron and steel. The bit is manufactured from high speed steel with an oxide finish that provides basic surface protection. The straight-cylindrical shank seats in standard drill chucks without modification. Machinists, maintenance technicians, and fabricators use this bit for small-diameter through-hole work on the bench or at the machine.

This bit belongs to the PRECISION TWIST DRILL Series R18, a general-purpose line built to ANSI standards. It is intended for drilling cast iron and steel in light production, maintenance, and repair environments. The 7/8-inch overall length and 3/16-inch flute length make it appropriate for shallow-hole applications where a compact tool is needed. Right-hand spiral flutes evacuate chips efficiently during drilling. Coolant-through is not supported on this bit, so conventional flood or mist cooling is applied externally when required.

Key Features

• Wire size 78 diameter at 0.016 inches for precise small-diameter hole work
• 118-degree standard point angle for use in cast iron and steel
• High speed steel construction with oxide finish surface treatment
• Right-hand cut with regular spiral flute for consistent chip evacuation
• Web-thinned, tapered web configuration reduces thrust and improves cut initiation
• Built to ANSI standards as part of the Series R18 general-purpose line

Compatibility

Designed as an OEM-style replacement and general-purpose jobber drill bit for use in standard drill chucks accepting straight-cylindrical shanks, suitable for bench drills, drill presses, and hand-held power drills used in metalworking and maintenance applications.

Installation Notes

This bit is installed by a machinist or maintenance technician into a standard keyless or keyed drill chuck. Secure the straight-cylindrical shank fully in the chuck jaws before drilling. Always power down or de-energize the drill press or machine tool before changing bits. At 0.016 inches diameter, this bit is fragile -- use low feed pressure and appropriate spindle speed for the workpiece material to avoid breakage.