Precision Twist Drill 5996166 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996166 is a cobalt screw machine length drill bit designed for drilling into hard and tough materials where standard high-speed steel bits fall short. Built to Series M41CO specifications, this bit measures 0.204 inches (Wire Size 6) in diameter with an overall length of 2-3/8 inches and a flute length of 1-1/4 inches. The 135-degree split point reduces walking on contact and requires no center punch on most surfaces. A web-thinned, tapered web design lowers thrust and improves chip evacuation, making it a reliable choice for production and heavy-duty intermittent drilling.

This bit is suited for use in screw machine operations, CNC drilling, and hand-held drill press applications where a shorter, stiffer bit is preferred over a jobber-length design. The reduced length improves rigidity and minimizes deflection when drilling hard metals, stainless steel, high-strength alloys, and similar difficult workpiece materials. Machinists, tool-and-die workers, and maintenance technicians in industrial and commercial settings will find this bit appropriate for tight-tolerance hole production in hard material applications.

Key Features

• Cobalt (M41 grade) construction provides heat and wear resistance when drilling hard materials
• 135-degree split point reduces thrust and eliminates center-punch requirement on most workpieces
• Screw machine length (2-3/8 inches overall) delivers added rigidity and reduced deflection versus jobber-length bits
• Web-thinned tapered web improves chip flow and lowers cutting resistance
• Right-hand spiral flute with regular helix for consistent chip evacuation
• Straight-cylindrical shank fits standard three-jaw drill chucks without adapters
• Meets ANSI standards for dimensional accuracy and performance classification

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit compatible with standard straight-shank drill chucks and collet holders accepting a 0.204-inch diameter shank.

Installation Notes

This bit is installed and operated by machinists or maintenance technicians using a drill press, CNC machine, or hand drill with a compatible chuck. Secure the shank fully in the chuck and verify there is no runout before beginning a cut. Use appropriate cutting fluid or coolant when drilling hard alloys to extend tool life, even though this bit does not support coolant-through delivery. Follow applicable shop safety standards and machine guarding requirements during operation.