Precision Twist Drill 5998657 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998657 is a screw machine length drill bit designed for high-performance metal drilling in tight, close-tolerance applications. Built from high speed steel with a web-thinned, tapered web construction, it cuts right-hand with a standard 135-degree split point that reduces walking and requires less thrust than a conventional 118-degree point. At 0.043 inches in diameter with an overall length of 1-3/8 inches and a flute length of 1/2 inch, this bit fits compact drilling setups where full-length bits are impractical. Licensed HVAC technicians, machinists, and maintenance tradespeople rely on this series for precision hole placement in hard-to-reach locations.

The 5998657 is rated for primary use on titanium workpieces, making it well-suited for high-strength aerospace and industrial maintenance applications where standard drill bits fail prematurely. Its 2.5xD flute-to-diameter ratio provides chip clearance during short-depth drilling operations. The R41C series is built to ANSI and NAS 907 specifications, confirming dimensional and performance consistency across production runs. Package quantity is 1 bit per unit; minimum order quantity is 12 units.

Key Features

• 135-degree split point reduces bit walking and cutting thrust on hard materials
• Web-thinned tapered web improves chip evacuation and reduces heat buildup
• High speed steel construction with coated finish for extended tool life
• Screw machine length body fits restricted-access drilling setups
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Meets ANSI and NAS 907 standards for heavy-duty, high-performance drilling

Compatibility

Designed as a screw machine length replacement drill bit for applications requiring a 0.043 inch (No. 57 wire gauge) diameter hole in titanium and similarly hard workpiece materials, conforming to ANSI and NAS 907 dimensional standards.

Installation Notes

This bit is installed by machinists or maintenance tradespeople using a standard drill press, CNC machine, or hand drill with an appropriately sized chuck or collet. Secure the straight-cylindrical shank firmly before operation to prevent runout that could snap the small-diameter bit. Use appropriate cutting fluid for titanium to manage heat and extend tool life. Inspect the cutting edges before each use; at 0.043 inches diameter, the bit is susceptible to breakage if run at incorrect speed or feed rates.