Precision Twist Drill 5998538 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998538 is a screw machine length drill bit designed for high-performance metal drilling in industrial and trade applications. Built from high speed steel with a bright, uncoated finish, this bit features a 0.625-inch (5/8 inch) diameter, a standard 118-degree point angle, and a web-thinned, tapered web configuration that reduces thrust and improves chip evacuation. The straight-cylindrical shank seats securely in standard drill chucks. At 4.25 inches overall length with a 2.75-inch flute, the stubby screw machine profile adds rigidity and minimizes deflection in short-hole applications. Machinists, tool-and-die workers, and maintenance mechanics install this bit in drill presses, CNC machines, and handheld drills.

This bit is rated for general-purpose drilling with a listed primary workpiece material of titanium, making it suitable for demanding non-ferrous and ferrous material applications. The Series R40 designation places it within PRECISION TWIST DRILL's high-performance line, manufactured to ANSI standards. The 2.5xD flute-to-diameter ratio and spiral flute geometry support controlled chip removal during deep-pass operations. It is appropriate for production drilling environments where a compact, rigid bit is preferred over jobber-length alternatives.

Key Features

• 0.625-inch (5/8 inch) diameter, screw machine length for added rigidity
• High speed steel construction for durability across ferrous and non-ferrous materials
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust
• Right-hand spiral flute geometry for efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks
• Manufactured to ANSI standards, Series R40 high-performance designation

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard drill chucks and collet systems accepting a straight-cylindrical shank in 0.625-inch diameter; listed primary workpiece material is titanium, suitable for a range of metalworking applications.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance mechanics familiar with cutting tool safety. Ensure the drill press, lathe, or CNC spindle is fully powered down and locked out before changing bits. Secure the straight-cylindrical shank firmly in the chuck or collet to the manufacturer-specified engagement depth before beginning any cut. Always wear appropriate eye protection and follow facility safety standards when operating rotating cutting tools.