Precision Twist Drill 5998795 Letter N Hss Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5998795 is a jobber length drill bit in Letter N size (0.3020 inches decimal equivalent), designed for general-purpose drilling in metal and hard materials. Ground from high speed steel with a steam oxide coating, it features a 135-degree split-point angle that reduces walking on contact and lowers required feed pressure. The spiral, web-thinned, tapered-web flute design promotes efficient chip evacuation. At 4.375 inches overall length with a 3.0625-inch flute, this bit fits standard drill chucks and is suited for use in handheld drills, drill presses, and CNC drilling operations. Weighing 0.19 pounds, it is a heavy-duty grade bit built to NAS 907 and ANSI standards.

This bit is intended for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and other hard materials. It is well suited to maintenance, fabrication, and production environments where consistent hole quality in tough workpiece materials is required. The straight-cylindrical shank fits standard drill chucks without adapters. The R10B-R15B-R18B series covers a range of comparable jobber length configurations, making this bit appropriate for shops that stock across the Letter-size drill range.

Key Features

• Letter N size: 0.3020 inches decimal equivalent for precise hole sizing
• 135-degree standard split point reduces bit walking and entry burring
• High speed steel construction with steam oxide coating for lubricity and corrosion resistance
• Web-thinned, tapered web promotes chip clearance in deep-hole applications up to 3.0625 inches depth
• Right-hand cut, 2-flute spiral design suits a wide range of drilling equipment
• Meets NAS 907 and ANSI standards; heavy-duty grade rating

Compatibility

Designed as a general-purpose jobber length drill bit compatible with standard straight-shank drill chucks. Rated for use in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium workpieces per workpiece material codes P, M, K, N, and S.

Installation Notes

Secure the shank fully in the drill chuck before operation and verify chuck key is removed before powering the drill. Use appropriate cutting fluid or coolant when drilling stainless steel, superalloys, or titanium to extend tool life; note this bit does not support through-coolant. Ensure spindle speed is set to match the workpiece material and bit diameter per standard machining tables. This bit is intended for professional use by machinists, maintenance technicians, and metalworking tradespeople.