Precision Twist Drill 5998807 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998807 is a screw machine length drill bit designed for high-performance drilling in metal fabrication and machining applications. Built from high speed steel (HSS) with a bright, uncoated finish, this bit features a 118-degree standard point angle and a right-hand spiral flute for efficient chip evacuation. The straight-cylindrical shank seats securely in standard drill chucks. At 0.173 inches in diameter with an overall length of 2.1875 inches and a flute length of 1.125 inches, this Series R41 bit is sized for precision work in tight clearance situations. The web-thinned, tapered web configuration reduces thrust and improves entry performance on harder workpieces.

This drill bit is suited for machining shops, tool rooms, and field service work requiring short-length bits with reduced runout risk. The screw machine length profile — shorter than jobber length — provides added rigidity, making it appropriate for CNC drilling, turret lathes, and screw machine applications. The primary workpiece material rating is titanium, though the general-purpose grade supports a range of ferrous and non-ferrous materials. The 2.5xD flute-to-diameter ratio supports controlled chip flow in shallow-to-moderate depth holes.

Key Features

• 0.173 inches (wire size No. 17) diameter for precision hole sizing
• High speed steel construction for durability across general-purpose metal drilling
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust
• Screw machine length body adds rigidity over jobber-length alternatives
• Right-hand cut with regular spiral flute for consistent chip evacuation
• ANSI-compliant Series R41 construction

Compatibility

Designed as an OEM-style replacement and standard fitment screw machine drill bit for use with straight-shank drill chucks on CNC machining centers, turret lathes, drill presses, and handheld power drills accepting straight-cylindrical shanks.

Installation Notes

Installation is performed by machinists and tool room technicians. Secure the straight-cylindrical shank fully into the drill chuck and verify concentricity before operation. Power down and de-energize all equipment before bit changes. Use appropriate cutting fluid or lubricant based on workpiece material to extend tool life and maintain hole quality.