Precision Twist Drill 5999168 Jobber Drill Bit 39 Hss

Product Description

The PRECISION TWIST DRILL 5999168 is a jobber-length twist drill bit in wire gauge size 39, with a decimal diameter of 0.0995 inches. Built from high speed steel with a steam oxide coating, it is designed for general-purpose drilling in a wide range of materials. The 135-degree split point reduces walking on entry and lowers thrust requirements compared to a standard 118-degree point. With an overall length of 2.375 inches and a 1.375-inch spiral flute, this bit is installed by machinists, maintenance technicians, and metalworking professionals in both shop and field environments.

This drill bit is suited for use in ferrous and non-ferrous metals, including steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It fits the general-purpose jobber-length category and is appropriate for use in standard drill presses, CNC machining centers, and hand drills where a straight cylindrical shank is accepted. The Series R18B designation and NAS 907 specification make it a recognized standard in aerospace and industrial maintenance applications.

Key Features

• Wire size 39 with a decimal diameter of 0.0995 inches for precise gauge-standard hole sizing
• 135-degree standard point angle reduces drill walk and lowers entry thrust
• Steam oxide coating provides lubricity and basic corrosion resistance during storage and use
• High speed steel construction with heavy-duty grade rating for extended tool life in hard materials
• Web-thinned, tapered web design reduces cutting resistance and improves chip evacuation
• Right-hand cut with regular spiral and 2 flutes; no coolant-through requirement for general shop use

Compatibility

Designed as an OEM-style general-purpose jobber-length drill bit compatible with any drill chuck or collet accepting a 0.0995-inch straight cylindrical shank. Meets ANSI standards and NAS 907 specification. Part of the R10B, R15B, and R18B series.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard drill press, hand drill, or CNC spindle with a chuck rated for the shank diameter. Secure the shank fully in the chuck before operation and confirm the workpiece is clamped to prevent rotation. Cutting fluid or light oil is recommended when drilling stainless steel, cast iron, or titanium to extend bit life. Inspect the cutting edges for wear before each use and replace when the point shows chipping or significant dulling.