Precision Twist Drill 5996085 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996085 is a cobalt screw machine length drill bit engineered for demanding, short-reach drilling applications in hard and abrasive materials. It carries a wire gauge size of 40, corresponding to a decimal diameter of 0.098 inches, and features a 135-degree split point that reduces walking and allows immediate bite without a center punch. The M41CO cobalt construction provides elevated heat resistance compared to standard high-speed steel, making this bit well suited for stainless steel, hardened alloys, and other high-strength workpieces. A right-hand spiral flute with web-thinned, tapered web configuration promotes efficient chip evacuation in deep or interrupted cuts.

This bit is used in screw machine and production drilling operations where a shorter overall length provides rigidity and reduces deflection. The straight-cylindrical shank accepts standard drill chucks on drill presses, hand drills, and CNC drilling machines. It is a common choice for metalworking tradespeople, maintenance machinists, and fabrication shops handling hard material where standard HSS bits lose cutting edge quickly. The 2.5xD flute-to-diameter ratio supports controlled chip clearing in short, repetitive drilling cycles.

Key Features

• M41CO cobalt construction for high heat resistance in hard and abrasive materials
• 135-degree split point reduces thrust force and eliminates center-punch requirement
• Web-thinned, tapered web configuration improves penetration and chip flow
• Screw machine length body provides added rigidity and reduced deflection versus jobber length
• Right-hand spiral flute with regular spiral type for consistent chip evacuation
• Meets ANSI standards and rated for heavy-duty, high-performance applications

Compatibility

Designed as an OEM-style replacement and production-use cobalt screw machine drill bit for use in standard drill chucks accepting straight-cylindrical shanks across drill press, hand drill, and CNC drilling machine setups.

Installation Notes

This bit should be installed and operated by qualified machinists or metalworking tradespeople familiar with drill press and CNC equipment. Secure the straight-cylindrical shank fully in a properly sized chuck before operation and verify runout is within acceptable tolerance. Use appropriate cutting fluid or coolant when drilling hard alloys to extend bit life, even though this tool does not support coolant-through delivery. Inspect the split point for chipping or wear before each use and replace if the cutting edge is compromised.