Precision Twist Drill 5996175 Cobalt Drill Bit 0.159 in

Product Description

The PRECISION TWIST DRILL 5996175 is a screw machine length cobalt drill bit designed for drilling hard and abrasive materials in high-production environments. Built to Series M41CO standards, it measures 0.159 inches (Number 21 wire gauge) in diameter with an overall length of 2.125 inches and a flute length of 1.0625 inches. The 135-degree split point reduces walking on entry and requires less thrust than a standard 118-degree point. The cobalt construction and web-thinned, tapered web design make this bit a reliable choice for machinists, maintenance techs, and fabricators working with hard steels and tough alloys.

This bit is suited for screw machine operations, drill press work, and hand-drill applications where a shorter, stiffer tool is needed to control deflection. The reduced length compared to a jobber-length bit improves rigidity in tight setups and gang-drilling fixtures. It is commonly used in metal fabrication shops, HVAC equipment assembly, and industrial maintenance where drilling into hardened steel, stainless, or similarly tough base materials is routine. The straight-cylindrical shank fits standard three-jaw drill chucks without adapters.

Key Features

• Cobalt M41 material grade for extended tool life in hard and abrasive workpiece materials
• 135-degree split point for reduced thrust and self-centering entry without a pilot hole
• Web-thinned tapered web reduces cutting resistance and improves chip evacuation
• Screw machine length (2.125 inches overall) provides added rigidity over jobber-length bits
• Regular spiral flute with 2.5xD flute-to-diameter ratio supports controlled chip clearing
• ANSI-compliant construction meets standard dimensional and performance specifications

Compatibility

Designed as an OEM-style replacement or direct substitute for Number 21 wire gauge screw machine length drill bits in standard three-jaw chuck drill equipment used on hard material workpieces.

Installation Notes

Installation and use of this drill bit should be performed by a qualified machinist or experienced trades professional. Secure the straight-cylindrical shank firmly in a properly sized drill chuck before operation and verify the chuck key is removed before powering the tool. Always wear appropriate eye protection and follow applicable shop safety procedures when drilling metal. Do not exceed the recommended speed and feed range for the workpiece material and bit diameter.