Precision Twist Drill 5996046 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996046 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and difficult-to-machine materials. Ground to a 135-degree split point with web thinning, it starts on center without a pilot hole and reduces thrust in tough stock. The straight-cylindrical shank seats securely in standard drill chucks. At 0.18 inches in diameter (Wire Size 15) with a 1-1/8 inch flute length and 2-3/16 inch overall length, this stub-length bit delivers maximum rigidity and minimal deflection. It belongs to the M41CO series, built to ANSI standards for consistent geometry and interchangeability across production setups.

This bit is suited for metalworking applications involving hard ferrous and non-ferrous materials where standard high-speed steel bits fall short. The screw machine length format is a standard choice in machine shop environments, CNC setups, drill press operations, and production-line work where short flute length reduces chatter and improves hole accuracy. Machinists, tool-and-die technicians, and maintenance professionals working with stainless steel, hardened alloys, titanium, and similar hard materials will find this bit appropriate for their drilling requirements.

Key Features

• Cobalt construction handles hard and heat-resistant workpiece materials
• 135-degree split point with web thinning for self-centering entry and reduced thrust
• Screw machine (stub) length provides maximum rigidity and minimizes deflection
• Regular spiral flute with 2.5xD flute-to-diameter ratio promotes efficient chip evacuation
• Right-hand cut, straight-cylindrical shank fits standard three-jaw drill chucks
• Tapered web configuration and ANSI-standard geometry for consistent, repeatable results

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit compatible with any standard drill press, CNC machining center, or hand drill accepting a straight-cylindrical shank in the 0.18-inch diameter class.

Installation Notes

Installation is performed by machinists or maintenance technicians using standard drill chuck tooling. Secure the shank fully in the chuck and verify runout before beginning a cut. Appropriate cutting fluid or coolant is recommended when drilling hard ferrous or alloy materials to extend tool life, even though this bit does not support through-coolant delivery. Always wear appropriate eye protection and follow shop safety procedures when operating rotating cutting tools.