Precision Twist Drill 5996027 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996027 is a cobalt screw machine length drill bit engineered for drilling into hard and abrasive materials. Built to the M41CO series specification, this bit features a 135-degree split point with web thinning for fast penetration and reduced walking on entry. The straight-cylindrical shank fits standard drill chucks without modification. At 1-15/16 inches overall length with a 15/16-inch flute, this stub-length geometry provides added rigidity compared to jobber-length bits, making it well suited for high-cycle production and precision work in confined spaces. Machinists, tool and die technicians, and maintenance professionals install this bit in handheld and bench-mounted drilling equipment.

This bit is sized to Wire Gauge 28, with a decimal diameter of 0.1405 inches. The screw machine length format is commonly used in CNC drilling, drill press operations, and automated machining fixtures where shorter overhang reduces deflection and improves hole accuracy in tough materials. The cobalt construction allows operation at higher cutting speeds and temperatures than standard high-speed steel bits, making it a practical choice for stainless steel, hardened alloys, cast iron, and other hard workpiece materials where conventional HSS bits wear prematurely.

Key Features

• Cobalt M41 material grade for high heat resistance and extended tool life in hard materials
• 135-degree split point reduces thrust and self-centers on entry without a center punch
• Web-thinned, tapered web construction improves chip clearance and cutting efficiency
• Screw machine stub length adds rigidity and reduces deflection in tight drilling applications
• Right-hand cut spiral flute evacuates chips efficiently during through-hole drilling
• ANSI standard compliance ensures dimensional interchangeability with other ANSI-rated tooling

Compatibility

Designed as a heavy-duty screw machine length drill bit for use in standard drill chucks accepting straight-cylindrical shanks. Compatible with handheld drills, drill presses, CNC machining centers, and automatic screw machine setups requiring Wire Gauge 28 or 0.1405-inch diameter holes in hard workpiece materials.

Installation Notes

A licensed machinist or qualified maintenance technician should secure the bit firmly in the chuck before operation and verify runout is within acceptable limits. Always power down and lock out the drilling equipment before installing or removing the bit. Use appropriate cutting fluid or coolant when drilling hard materials to extend tool life, noting this bit does not support internal coolant-through delivery. Follow applicable shop safety and ANSI B11 machine tool standards for drilling operations.