Precision Twist Drill 5996536 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996536 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and abrasive workpiece materials. Built to M42 cobalt material grade standards, it features a 0.368 inch (Letter U) diameter, a 135-degree split point for self-centering entry, and a web-thinned, tapered web configuration that reduces thrust and improves chip clearance. The straight-cylindrical shank seats securely in standard drill chucks. At 3.125 inches overall length with a 1.8125 inch flute length, this bit is sized for screw machine applications requiring a compact, rigid cutting tool. Licensed machinists, toolmakers, and maintenance technicians reach for this bit when drilling tough, work-hardening, or hard-grade metals where standard HSS bits fall short.

This bit is built for use in drill presses, CNC machining centers, screw machines, and benchtop production setups where short, rigid tooling is preferred. The screw machine length reduces deflection and improves hole accuracy in metal fabrication, production machining, and heavy-duty maintenance environments. It carries ANSI specification designation and is rated for heavy-duty service in the M42CO series. The 2.5xD flute-to-diameter ratio supports efficient chip evacuation in blind and through-hole drilling of hard materials.

Key Features

• M42 cobalt construction for drilling hard and difficult-to-machine materials
• 135-degree split point with web thinning for reduced thrust and self-centering entry
• Screw machine length body minimizes deflection and improves hole location accuracy
• Straight-cylindrical shank for compatibility with standard drill chucks and collets
• Regular spiral flute with 2.5xD ratio for consistent chip removal
• ANSI-compliant, heavy-duty grade rated for high-performance production use

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit for applications involving hard workpiece materials in the 0.3500 to 0.4000 inch decimal inch size range, per ANSI standards.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or tool and die technicians familiar with metal cutting operations. Secure the straight-cylindrical shank fully in the chuck or collet before operation and verify runout before drilling. Always use appropriate cutting fluid or coolant when drilling hard or abrasive materials to extend tool life, noting that this bit does not support coolant-through delivery. Follow all applicable machine guarding and PPE requirements per shop safety standards.