Precision Twist Drill 5998951 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998951 is a screw machine length drill bit designed for high-performance drilling in metal and hard material applications. Built from high speed steel (HSS) with a bright/uncoated finish, this bit measures 0.323 inches in diameter and carries a 118-degree standard point angle. The shortened screw machine length body provides added rigidity compared to jobber-length bits, making it well suited for drill press and CNC lathe work where stub-length reach and reduced deflection are priorities. Web thinning improves penetration and reduces thrust at the point. Total weight is approximately 0.083 pounds.

This bit is rated for use on titanium as its primary workpiece material and is equally applicable across ferrous and non-ferrous metals in general-purpose production environments. The Series R42 designation places it in a recognized HSS screw machine line conforming to ANSI standards. It is commonly used in machine shops, manufacturing facilities, and field service applications where a right-hand, spiral-flute stub drill is required for high-cycle drilling operations.

Key Features

• 0.323 inch (letter size P) diameter with a 118-degree standard point angle
• High speed steel construction with bright/uncoated finish for general-purpose use
• Screw machine (stub) length body at 2-15/16 inches overall for added rigidity and reduced deflection
• 1-11/16 inch spiral flute length with a 2.5xD flute-to-diameter ratio
• Web-thinned tapered web for reduced thrust and improved chip clearance
• Right-hand cut with straight-cylindrical shank for standard chuck compatibility
• Conforms to ANSI standards; rated for titanium and general-purpose metal drilling

Compatibility

Designed as a general-purpose screw machine length drill bit for use in standard 3-jaw chucks, drill presses, lathes, and CNC machining centers accepting a straight-cylindrical shank. Fits the ANSI-standard drill bit size range of 0.3000 to 0.3500 inches (letter size P).

Installation Notes

Installation and use of this bit should be performed by qualified machinists or trade professionals familiar with rotating cutting tool safety. Ensure the spindle is fully stopped and the machine is powered down before mounting or removing the bit. Secure the straight-cylindrical shank firmly in the chuck to the full depth of engagement to prevent slippage. Follow applicable ANSI machining safety standards and shop-specific operating procedures when selecting feed rates and speeds for the workpiece material.