Precision Twist Drill 5995942 Cobalt Drill Bit 0.3281 in

Product Description

The PRECISION TWIST DRILL 5995942 is a screw machine length cobalt drill bit designed for high-performance drilling in hard and tough materials. Built to Series M40CO standards, it features a 135-degree split point for fast penetration and reduced walking on entry. The straight-cylindrical shank seats securely in standard drill chucks. At 2-15/16 inches overall length with a 1-11/16 inch flute length, this short-body geometry provides added rigidity in drill presses, CNC machines, and screw machine setups. The web-thinned, tapered web design reduces thrust and improves chip evacuation. Machinists, tool-and-die workers, and maintenance technicians install this bit where standard high-speed steel falls short on abrasion resistance.

This bit is suited for drilling hard metals including hardened steels, stainless alloys, and other difficult-to-machine materials in production and job-shop environments. The screw machine length format is a common choice for short-hole work on manual mills, drill presses, turret lathes, and CNC machining centers where stub-length rigidity reduces deflection. The 2.5xD flute-to-diameter ratio supports chip clearance in moderate-depth holes. It conforms to ANSI standards and is rated for heavy-duty grade service.

Key Features

• Cobalt M40CO material grade for heat resistance and durability in hard materials
• 135-degree split point reduces thrust and self-centers on entry
• Web-thinned tapered web improves chip flow and lowers cutting load
• Screw machine length body adds rigidity over jobber-length bits
• Right-hand spiral flute with regular helix for controlled chip evacuation
• Meets ANSI standards for dimensional consistency

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for applications requiring a 0.3281 inch diameter, straight-cylindrical shank, screw machine length bit compatible with standard drill chucks and collets used in drill presses, lathes, and CNC machining centers.

Installation Notes

This bit is installed and used by machinists and toolroom technicians. Secure the straight-cylindrical shank fully in the drill chuck or collet before operation. Ensure the machine spindle is fully stopped before changing or inspecting bits. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, noting this bit does not support through-coolant delivery.