Precision Twist Drill 5999169 Jobber Drill Bit No 4

Product Description

The PRECISION TWIST DRILL 5999169 is a jobber-length drill bit in No. 4 wire size (0.2090 inches decimal), designed for general-purpose drilling in metal and hard materials. Built from high speed steel (HSS) with a steam oxide coating, this bit features a 135-degree split point that reduces walking on entry and minimizes the need for a center punch. The two-flute spiral design with a tapered, web-thinned web clears chips efficiently through a 2.5-inch flute length. Overall length is 3.75 inches with a straight-cylindrical shank of 0.2090 inches in diameter. Licensed machinists, maintenance mechanics, and trade professionals install and use this bit for production and service drilling applications.

This drill bit is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium across a range of workpiece hardnesses. It fits standard drill chucks accepting a 0.2090-inch straight shank and is appropriate for use in handheld drills, drill presses, and CNC drilling operations. The Series R18B designation places it within a family of heavy-duty HSS jobber bits conforming to ANSI and NAS 907 specifications, making it a reliable choice for production environments and field service work where consistent hole quality in hard materials is required.

Key Features

• No. 4 wire size, 0.2090 inches decimal diameter for precise hole sizing
• 135-degree standard point angle reduces bit walking on entry into hard surfaces
• Steam oxide coating improves lubricity and provides mild corrosion resistance during storage
• Web-thinned, tapered web lowers thrust requirements and improves chip evacuation
• 2-flute regular spiral design handles a broad range of workpiece materials including superalloys and titanium
• Conforms to ANSI standards and NAS 907 specification for heavy-duty HSS drill bits

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard drill chuck accepting a 0.2090-inch straight-cylindrical shank, including handheld power drills, drill presses, and CNC spindles. Rated for use on steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium per the supplier-stated workpiece material classifications P, M, K, N, and S.

Installation Notes

This bit is installed and used by machinists, pipefitters, electricians, and general trade professionals performing metal drilling tasks. Secure the shank fully in the chuck and verify concentricity before drilling to avoid premature wear. Use appropriate cutting fluid or coolant when drilling stainless steel, superalloys, or titanium to manage heat buildup. Maximum recommended drilling depth is 2.5 inches; for deeper holes, retract the bit periodically to clear chips and reduce heat.