Precision Twist Drill 5998620 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998620 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Manufactured from high speed steel with a coated finish, this bit measures 0.173 inches in diameter with an overall length of 2-3/16 inches and a flute length of 1-1/8 inches. The 135-degree split point reduces walking and improves bite on entry, while the web-thinned, tapered web construction lowers thrust requirements. This bit is suited for machinists, maintenance technicians, and fabricators who need consistent, accurate holes in tight-tolerance work.

This drill bit is rated for use on titanium as its primary workpiece material, making it appropriate for aerospace, industrial maintenance, and precision fabrication environments where conventional bits fall short. The screw machine length profile provides added rigidity compared to jobber-length bits, which is advantageous when drilling in confined spaces or on drill press and CNC setups. The regular spiral flute and straight-cylindrical shank allow it to seat securely in standard three-jaw chucks and collet holders without slippage during operation.

Key Features

• 135-degree split point reduces center-walking and improves penetration on hard materials
• Web-thinned tapered web lowers drilling thrust and reduces heat buildup
• High speed steel construction with coated finish for extended tool life
• Screw machine length body offers greater rigidity than standard jobber-length bits
• Right-hand cut with regular spiral flute for efficient chip evacuation
• Meets ANSI and NAS 907 standards; Series R41C heavy-duty grade

Compatibility

Designed as a replacement or direct-fit screw machine drill bit for applications requiring a wire gauge No. 17 or 0.173-inch diameter hole, falling within the 0.1500 to 0.2000 inch drill bit size range of the R41C series. Compatible with standard straight-shank drill chucks and collet systems.

Installation Notes

This bit is installed and used by machinists, tool and die technicians, and industrial maintenance professionals. Secure the straight-cylindrical shank firmly in a calibrated chuck or collet before operation to prevent runout. Coolant-through is not supported on this bit; use appropriate cutting fluid applied externally when drilling titanium or other hard materials to manage heat. Follow shop safety protocols and verify spindle speed is appropriate for the workpiece material and bit diameter before use.