Precision Twist Drill 5997649 Jobber Drill Bit 51 Hss

Product Description

The PRECISION TWIST DRILL 5997649 is a jobber-length twist drill bit in wire gauge size 51, measuring 0.0670 inches in diameter. Built from high speed steel with a steam oxide coating, it features a 135-degree split point and a spiral flute configuration for general-purpose drilling operations. The bit has a 2-inch overall length with a 1-inch flute length and a straight-cylindrical shank. Right-hand cut geometry and a web-thinned, tapered web design reduce entry force and improve chip evacuation. Licensed HVAC technicians, machinists, plumbers, and electricians rely on this size for small-diameter pilot holes and precision work in tight clearances.

This drill bit is suited for drilling into steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and other hard materials. It fits standard drill chucks accepting a 0.0670-inch straight shank. The R18B series designation and NAS 907 specification make it a recognized choice for production and maintenance drilling in industrial and commercial settings where consistent hole quality at small diameters is required.

Key Features

• Wire gauge size 51, 0.0670-inch diameter for small-diameter precision drilling
• 135-degree split point reduces walking and lowers thrust requirements
• Steam oxide coating provides mild lubricity and corrosion resistance during storage
• High speed steel construction handles steel, stainless steel, cast iron, and superalloys
• Web-thinned tapered web improves chip clearance and reduces heat buildup
• Right-hand spiral flute with 15xD flute-to-diameter ratio for efficient chip ejection

Compatibility

Compatible with workpiece materials classified under ISO material codes P, M, K, N, and S, including steel, stainless steel, cast iron, non-ferrous metals, and superalloys. Fits any standard drill chuck or collet accepting a 0.0670-inch straight-cylindrical shank.

Installation Notes

Install in a drill press, hand drill, or CNC spindle with a chuck rated for the shank diameter before applying power. Secure the workpiece firmly before drilling to prevent deflection at this small diameter. Use cutting fluid appropriate for the workpiece material to extend bit life, particularly when drilling stainless steel or superalloys. Inspect the cutting edges before each use, as small-diameter HSS bits are susceptible to chipping if subjected to side load or excessive feed pressure.