Precision Twist Drill 5998507 25/64 in Hss Drill Bit

Product Description

The PRECISION TWIST DRILL 5998507 is a screw machine length drill bit designed for high-performance metal drilling in demanding shop and field applications. Built from high speed steel with a bright, uncoated finish, this bit features a 25/64 inch (0.3906 inch) diameter, a 118-degree standard point angle, and a right-hand spiral flute for efficient chip evacuation. The shortened screw machine length body provides added rigidity compared to jobber-length bits, reducing deflection in drill press and CNC turret setups. The web-thinned, tapered web construction lowers entry thrust and extends cutting life. Licensed machinists, tool-and-die technicians, and production floor operators are the primary users.

This drill bit is suited for general-purpose drilling in titanium and similar high-strength metals where a stiff, short-flute geometry is preferred. The 2.5xD flute-to-diameter ratio and straight cylindrical shank allow secure chuck engagement in standard three-jaw drill chucks and collet holders. Screw machine length bits are commonly selected for turret lathes, drill presses, and CNC machining centers where reduced stick-out is critical to dimensional accuracy. The R40 series designation places this bit in the ANSI-compliant general-purpose high-performance category.

Key Features

• 25/64 inch (0.3906 inch) diameter with ANSI-standard tolerances
• 118-degree standard point angle with web thinning for reduced thrust on entry
• High speed steel construction rated for titanium and general-purpose metal cutting
• Screw machine length body for added rigidity and reduced deflection
• Right-hand spiral flute promotes consistent chip evacuation
• Straight cylindrical shank fits standard chucks and collet holders without modification

Compatibility

Designed as an OEM-style screw machine length drill bit compatible with standard three-jaw drill chucks and collet systems accepting a straight cylindrical shank in the 25/64 inch diameter range. Listed primary workpiece material is titanium; suitable for general-purpose metal drilling per ANSI standards.

Installation Notes

Install this bit into a properly sized chuck or collet and verify secure seating before operation. Power down and lock out the machine spindle before changing bits. Use appropriate cutting fluid or coolant for titanium and hard-metal applications to manage heat buildup, even though this bit does not feature coolant-through capability. Follow shop safety protocols and applicable ANSI machining standards when operating rotating cutting tools.