Precision Twist Drill 5997778 Jobber Drill Bit 47 5/64

Product Description

The PRECISION TWIST DRILL 5997778 is a jobber-length twist drill bit sized at No. 47 (5/64 inch, 0.0785 inch decimal), designed for general-purpose drilling in metal and hard materials. It is manufactured from high speed steel with a steam oxide coating that reduces friction and provides light corrosion resistance during use. The 135-degree split point reduces walking on entry, making it well suited for drilling without a center punch on flat stock. Overall length is 2 inches with a 1-inch flute length and a straight-cylindrical shank. Machinists, fabricators, and maintenance technicians install this bit in standard drill chucks and drill presses for production and repair work.

This bit is built for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It fits into any standard 3-jaw drill chuck or collet accepting a 5/64-inch straight shank. Typical applications include precision hole drilling in sheet metal, structural steel, and hard-material fabrication where a short, rigid jobber-length bit is preferred over longer extended-length styles. The R18B series is rated heavy duty and meets ANSI and NAS 907 standards for consistent sizing and geometry across the production run.

Key Features

• No. 47 wire gauge size — 5/64 inch (0.0785 inch decimal) diameter for precision small-hole work
• 135-degree split point reduces drill walk and lowers thrust required on entry
• High speed steel construction handles steel, stainless, cast iron, non-ferrous metals, and titanium
• Steam oxide coating reduces friction and provides light corrosion protection
• Regular spiral, 2-flute design with web-thinned tapered web for efficient chip evacuation
• Meets ANSI standards and NAS 907 specification; heavy-duty grade with 13xD flute-to-diameter ratio

Compatibility

Designed as a general-purpose jobber-length drill bit for use in standard drill presses, hand drills, and machining centers accepting a 5/64-inch straight-cylindrical shank. Compatible with primary workpiece material codes P, M, K, N, and S covering steel, stainless steel, cast iron, non-ferrous metals, and superalloys and titanium.

Installation Notes

This bit is installed by machinists, tool-and-die technicians, and maintenance mechanics using standard 3-jaw chucks or collet systems. Secure the shank fully in the chuck before operation and confirm the bit runs true to avoid premature edge wear. Use appropriate cutting fluid when drilling stainless steel, hardened steel, or titanium to extend tool life. Follow ANSI B11 machine tool safety guidelines for drill press operation and guarding.