Precision Twist Drill 5996061 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996061 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and abrasive materials. Built to Series M41CO specifications and conforming to ANSI standards, this bit features a 135-degree split point for fast, accurate starting without center-punching. The straight-cylindrical shank seats securely in standard chucks, and the regular spiral flute with a 2.5xD flute-to-diameter ratio clears chips efficiently. At 0.166 inches (wire size 19) in diameter, it is suited for precision work in tight-clearance applications where a jobber-length bit would be impractical.

This screw machine length bit is used in metalworking and maintenance environments where stub-length rigidity reduces deflection in short-reach drilling setups. Machinists, tool-and-die technicians, and maintenance mechanics reach for this format when drilling hard ferrous metals, stainless steel, and other difficult workpiece materials in drill presses, CNC machines, and hand-held power tools. The cobalt construction and heavy-duty grade rating make it appropriate for production drilling where standard HSS bits wear prematurely.

Key Features

• Cobalt M41 material grade delivers heat resistance for drilling hard metals and alloys
• 135-degree split point reduces thrust and eliminates the need for a center punch
• Web-thinned, tapered web configuration improves cutting efficiency and reduces walking
• Screw machine (stub) length provides extra rigidity and reduces deflection in short-reach setups
• Right-hand cut with regular spiral flute for effective chip evacuation
• Conforms to ANSI standards for dimensional consistency

Compatibility

Designed as an OEM-style replacement or direct-use screw machine length drill bit for metalworking applications requiring a 0.166 inch (wire size 19) diameter cobalt bit with a straight-cylindrical shank.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance technicians familiar with proper tooling setup. Secure the straight-cylindrical shank firmly in the chuck before operation and verify that chuck runout is within acceptable limits to avoid premature bit wear or breakage. Use appropriate cutting fluid or coolant for the workpiece material, and never force the bit at feed rates beyond what the material and machine setup can support.