Precision Twist Drill 5996497 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996497 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and difficult-to-machine materials. Built to ANSI standards, this M42 cobalt bit features a 135-degree split point for fast, accurate starts with minimal walking. The straight-cylindrical shank seats securely in standard drill chucks and machine spindles. At 2-11/16 inches overall length with a 1-1/2 inch flute, the screw machine length profile provides rigid support in drill presses, CNC machining centers, and turret lathes. Web-thinned and web-tapered construction reduces thrust and improves chip evacuation in demanding applications.

This bit is suited for machinists, tool and die professionals, and maintenance technicians working with hard materials including alloy steels, stainless steel, and high-strength metals. The regular spiral flute with a 2.5xD flute-to-diameter ratio handles chip clearing in both through-hole and blind-hole drilling scenarios. The screw machine length design is a standard choice for production drilling where stub rigidity is preferred over jobber length reach. Right-hand cut configuration is compatible with conventional drill press and CNC spindle rotation.

Key Features

• M42 cobalt construction rated for heavy-duty drilling in hard materials
• 135-degree split point reduces entry thrust and eliminates center-punch requirements
• Web-thinned, tapered web design improves chip flow and reduces heat buildup
• Screw machine length body provides increased rigidity over jobber length bits
• Straight-cylindrical shank fits standard 3-jaw chucks and collet holders
• Meets ANSI specification for dimensional consistency

Compatibility

Designed as an OEM-style replacement and production-grade drill bit for use in standard drill presses, CNC machining centers, turret lathes, and hand-held electric drills accepting straight-cylindrical shanks in the 0.250 to 0.300 inch diameter range.

Installation Notes

Installation should be performed by qualified machinists or maintenance technicians familiar with rotary cutting tools. Ensure the machine spindle is fully stopped and de-energized before inserting or removing the bit. Seat the shank fully in the chuck or collet and confirm runout before beginning a cut. Use cutting fluid appropriate for the workpiece material to extend tool life and manage heat in cobalt-grade tooling.