Precision Twist Drill 5999350 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999350 is a screw machine length drill bit designed for high-performance drilling in tough workpiece materials, including titanium. Built from high speed steel with a coated finish, this bit features a 135-degree split point and web-thinned, tapered web construction that reduces thrust and improves centering without a center punch. At 0.246 inches in diameter with an overall length of 2.5 inches and a flute length of 1.375 inches, it fits standard drill chucks and offers the short, rigid geometry that screw machine length bits are known for. It is intended for use by machinists, maintenance technicians, and metalworking tradespeople in production and repair environments.

This bit is suited for drilling non-ferrous and hard metals, with titanium listed as the primary workpiece material. The screw machine length profile provides added rigidity compared to jobber length bits, making it a practical choice for drill press work, CNC setups, turret lathes, and hand-held drilling in tight clearance situations. The right-hand spiral flute with a 2.5xD flute-to-diameter ratio supports efficient chip evacuation during through-hole and blind-hole drilling operations. The Series R42C designation identifies it within the PRECISION TWIST DRILL heavy duty line.

Key Features

• 135-degree split point reduces walking and lowers required feed pressure
• Web-thinned, tapered web construction improves cutting efficiency on hard materials
• High speed steel construction with coated finish for extended tool life
• Screw machine length body provides a rigid, stub profile for accurate hole placement
• Right-hand cut with regular spiral flute for reliable chip clearance
• Meets ANSI and NAS 907 standards; Series R42C heavy duty grade

Compatibility

Designed as a heavy duty screw machine length drill bit for use on titanium and similar hard metals; compatible with standard straight-cylindrical shank drill chucks across drill presses, CNC machines, turret lathes, and portable drilling equipment accepting a 0.246-inch shank.

Installation Notes

Install into a properly rated drill chuck and verify chuck jaw grip on the full cylindrical shank before applying power. Secure workpieces firmly before drilling to prevent movement and tool breakage. Use appropriate cutting fluid or coolant for titanium and hard-metal applications to manage heat buildup. Inspect the cutting edges for wear or chipping before each use and replace the bit if the split point or flute geometry is damaged.