Precision Twist Drill 5999118 No. 28 9/64 in Hss Drill Bit

Product Description

The PRECISION TWIST DRILL 5999118 is a jobber-length twist drill bit designed for general-purpose drilling in metal and hard materials. It carries a No. 28 wire gauge size, equivalent to 9/64 inch (0.1405 inch decimal), and features a 135-degree split point angle for fast penetration and reduced walking on entry. The bit is manufactured from high speed steel with a steam oxide coating that provides light lubricity and corrosion resistance during storage and use. Overall length is 2.875 inches with a flute length of 1.75 inches. The straight cylindrical shank diameter matches the drill diameter at 0.1405 inch, making it compatible with standard drill chucks. This is a right-hand cut, two-flute design from the R18B series.

This drill bit is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It is a standard jobber-length format appropriate for hand drills, drill presses, and CNC drilling operations in light to medium production environments. The 135-degree point geometry reduces thrust force compared to 118-degree conventional points, making it particularly useful when starting holes on curved or hard surfaces without a center punch. It meets ANSI and NAS 907 standards and carries a flute-to-diameter ratio of 12xD for adequate chip evacuation in typical drilling depths.

Key Features

• No. 28 wire size, 9/64 inch (0.1405 inch decimal) drill diameter
• 135-degree split point with web thinning for reduced thrust and self-centering entry
• High speed steel construction for durability across a wide range of workpiece materials
• Steam oxide finish for light corrosion resistance and improved lubricity
• Right-hand cut, regular spiral, two-flute design for efficient chip removal
• Meets ANSI and NAS 907 standards; straight cylindrical shank fits standard chucks

Compatibility

Designed as an OEM-style jobber-length drill bit compatible with any standard drill chuck or collet accepting a 0.1405 inch straight cylindrical shank. Rated for use on steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium per the manufacturer's listed workpiece material codes P, M, K, N, and S.

Installation Notes

Installation and use should be performed by machinists, maintenance technicians, or qualified tradespeople familiar with drilling operations. Secure the shank fully in the chuck before operation and verify chuck key is removed before powering the drill. Use appropriate cutting fluid for stainless steel, superalloys, or titanium to extend tool life. Do not exceed the recommended maximum drilling depth of 1.75 inches for this bit length.