Precision Twist Drill 5998170 Jobber Drill Bit 29/64 in

Product Description

The PRECISION TWIST DRILL 5998170 is a jobber-length twist drill bit designed for general-purpose hole drilling in metal and hard materials. It measures 29/64 inch (0.4531 inch) in diameter and features a 135-degree split point with web thinning for fast engagement and reduced walking on entry. The high-speed steel construction is finished with a steam oxide coating that provides mild lubricity and corrosion resistance. At 5.625 inches overall length with a 4.1875-inch flute length, this bit fits standard drill chucks and magnetic drill presses used by machinists, maintenance technicians, and fabricators working in production or field environments.

This drill bit is rated for use in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium, covering ISO material groups P, M, K, N, and S. It is suited to light manufacturing, MRO work, and structural fabrication where a reliable jobber-length bit handles through-holes in plate, tube, and structural shapes. The straight cylindrical shank with a 1.4375-inch shank length seats securely in Jacobs-style chucks on benchtop drill presses, hand drills, and CNC machining centers with standard ER collets.

Key Features

• 29/64 inch (0.4531 inch) diameter with matching straight-cylindrical shank for true runout
• 135-degree split point with web thinning reduces thrust force and eliminates center punching on most metals
• Steam oxide finish reduces friction and helps resist rust in storage
• Two-flute regular spiral design clears chips efficiently in through-hole drilling
• 4.1875-inch maximum drilling depth supports full jobber-length applications
• Meets ANSI standards and NAS 907 specification for dimensional accuracy

Compatibility

Designed as an OEM-style general-purpose jobber drill bit in Series R10B-R15B-R18B, compatible with any standard straight-shank drill chuck accepting a 29/64 inch shank diameter.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard keyed or keyless chuck. Secure the shank fully into the chuck before beginning any drilling operation and verify the drill press or hand tool is set to an appropriate RPM for the workpiece material and bit diameter. Use cutting fluid or coolant on stainless steel, titanium, and superalloys to extend tool life. Do not use this bit in hammer-drill mode; the straight shank and flute geometry are not rated for percussion applications.