Precision Twist Drill 5995946 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5995946 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and difficult-to-machine materials. Built to Series M40CO standards, this bit features a 135-degree split point for fast engagement and reduced walking on entry. The straight-cylindrical shank provides secure chuck retention, and the web-thinned, tapered web construction reduces cutting resistance and heat buildup. At 23/64 inch (0.3594 inches) in diameter with a 1-3/4-inch flute length and a 3-1/16-inch overall length, it fits standard drill presses, CNC machines, and hand-held power tools used in production and fabrication environments. Machinists, tool and die technicians, and industrial maintenance professionals are the primary users.

This bit is suited for drilling hard metals and tough workpiece materials in screw machine, production drilling, and short-hole applications. The shorter screw machine length body offers increased rigidity over jobber-length bits, making it a practical choice in tight setups or gang-drilling fixtures. The 2.5xD flute-to-diameter ratio supports adequate chip evacuation without sacrificing stiffness. It is ANSI-compliant and rated as heavy duty, making it appropriate for repeated-cycle production use where bit longevity and consistent hole quality are priorities.

Key Features

• Cobalt construction with M40 material grade for heat and wear resistance in hard materials
• 135-degree split point reduces thrust force and eliminates the need for center punching
• Web-thinned tapered web lowers cutting resistance and promotes chip clearance
• Screw machine length body increases rigidity compared to standard jobber-length bits
• Right-hand spiral flute design compatible with standard drill chucks and CNC spindles
• ANSI-compliant construction meets recognized tooling standards for dimensional accuracy

Compatibility

Designed as an OEM-style replacement or direct-use cobalt screw machine drill bit for applications requiring a 23/64 inch diameter hole in hard or abrasive workpiece materials, within the 0.3500 to 0.4000 inch drill bit size range of the M40CO series.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with drill press, lathe, or CNC machine operation. Secure the straight-cylindrical shank firmly in the chuck or collet before operation and confirm runout is within acceptable limits. Coolant-through is not supported on this bit, so adequate external coolant or cutting fluid application is recommended when drilling hard materials to manage heat. Follow all applicable machine guarding and PPE requirements per shop safety standards.