Precision Twist Drill 5996553 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996553 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and difficult-to-machine materials. Built to Series M42CO standards, this bit features a 135-degree split point for fast penetration and reduced walking on entry, paired with a web-thinned, tapered web configuration that lowers thrust requirements. The straight-cylindrical shank fits standard drill chucks without modification. At 0.404 inches in diameter and 3-5/16 inches overall length, it is sized for close-quarters and production drilling applications where a shorter flute-to-diameter ratio improves rigidity and control.

This bit is suited for machinists, maintenance technicians, and fabricators working with hard metals, stainless steel, heat-treated alloys, and other tough workpiece materials. The screw machine length format makes it a practical choice for drill press, CNC, and turret lathe work where stub-length rigidity is preferred over jobber-length reach. The 2.5xD flute-to-diameter ratio and regular spiral flute geometry support consistent chip evacuation in through-hole drilling operations.

Key Features

• M42 cobalt tool material rated for heavy-duty drilling in hard and abrasive materials
• 135-degree split point reduces thrust and eliminates center-punch requirements on many surfaces
• Web-thinned, tapered web configuration lowers cutting resistance and extends tool life
• Screw machine length body (3-5/16 inches overall, 1-15/16 inches flute) provides added rigidity over jobber-length bits
• Right-hand cut with regular spiral flute for reliable chip evacuation
• Straight-cylindrical shank fits standard and keyless drill chucks
• Meets ANSI specification standards for dimensional consistency

Compatibility

Designed as a direct-fit screw machine length drill bit for use in standard drill chucks accepting straight-cylindrical shanks; suitable for drill presses, CNC machining centers, turret lathes, and hand-held power drills used in metal fabrication and maintenance applications.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or maintenance technicians familiar with metal-cutting operations. Secure the straight-cylindrical shank fully in the chuck and verify concentricity before beginning any drilling cycle. Ensure the workpiece is properly clamped before applying cutting pressure. Always follow shop safety protocols, including appropriate eye protection and chip-guard use, when drilling hard materials with high-speed or cobalt tooling.