Precision Twist Drill 5996041 Cobalt Drill Bit 0.1285 in

Product Description

The PRECISION TWIST DRILL 5996041 is a screw machine length cobalt drill bit designed for high-performance drilling in hard and tough materials. Built to Series M41CO standards, this bit features a 135-degree split point that reduces walking and cutting force on entry, making it well-suited for production drilling environments where precision and tool life matter. The straight-cylindrical shank is compatible with standard drill chucks, and the right-hand spiral flute geometry promotes efficient chip evacuation. At 0.1285 inches (Wire Size 30) in diameter, this bit handles applications where tight tolerances are required.

This drill bit is intended for use in metalworking and machining applications involving hard materials such as stainless steel, high-strength alloys, and other difficult-to-machine stock. The screw machine length designation means a shorter overall length compared to jobber-length bits, which provides greater rigidity and reduces deflection in close-quarters or fixture-based drilling setups. Machinists, tool-and-die technicians, and maintenance mechanics working with drill presses, CNC machines, or hand drills will find this bit appropriate for precision hole work in production and repair contexts.

Key Features

• Cobalt (M41 grade) construction for heat and wear resistance in hard material drilling
• 135-degree split point reduces thrust force and eliminates the need for center-punching
• Web-thinned, tapered web design extends tool life and improves cutting efficiency
• Screw machine length (1-15/16 inches overall) provides added rigidity and reduced deflection
• Regular spiral flute with 2.5xD flute-to-diameter ratio for effective chip removal
• Right-hand cut with straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as an OEM-style replacement or standard drill bit for use in any drill press, hand drill, or CNC setup accepting a straight-cylindrical shank at Wire Size 30 (0.1285 inches) diameter.

Installation Notes

Machinists and maintenance technicians should ensure the drill chuck is clean and properly tightened before operation to prevent shank slippage. Power down the machine and follow lockout/tagout procedures before changing bits. Use appropriate cutting fluid or coolant when drilling hard alloys to preserve bit life, as this bit does not feature through-coolant capability. Inspect the split point for chipping or wear before each use, as cobalt bits used beyond their service life can fracture under load.