Precision Twist Drill 5996512 Cobalt Drill Bit 0.316 in

Product Description

The PRECISION TWIST DRILL 5996512 is a cobalt screw machine length drill bit sized at 0.316 inches (Letter O) with a 135-degree split point. Built to the M42CO series specification, this bit is engineered for drilling hard and abrasive materials where standard high-speed steel bits lose their edge. The right-hand spiral flute geometry with web thinning and a tapered web configuration reduces thrust and improves chip evacuation. Machinists, tool-and-die trades, and maintenance professionals use this bit when working with stainless steel, hardened alloys, and other demanding workpiece materials. It meets ANSI standards and is rated heavy-duty for high-performance cutting applications.

This screw machine length drill bit is intended for use in screw machine operations and short-reach drilling applications where a stub-length tool provides added rigidity over a jobber-length bit. The straight-cylindrical shank fits standard drill chucks and machine spindles without adapters. Its compact flute-to-diameter ratio of 2.5xD keeps deflection low during high-feed operations. It is suited for production drilling in metal fabrication shops, maintenance repair environments, and machine shops working with hard or work-hardening materials.

Key Features

• Cobalt M42 material grade for superior heat and wear resistance in hard materials
• 135-degree split point reduces walking and lowers required thrust force
• Web-thinned and tapered web configuration improves penetration and chip flow
• Screw machine (stub) length provides increased rigidity over jobber-length bits
• Right-hand spiral flute with regular spiral type for efficient chip removal
• Meets ANSI standards; rated heavy-duty for high-performance cutting

Compatibility

Designed as a direct-fit replacement or production-use drill bit for any standard drill chuck or machine spindle accepting a straight-cylindrical shank in the 0.316-inch diameter range.

Installation Notes

Insert the straight-cylindrical shank fully into the drill chuck or spindle and tighten securely before operation. Ensure the workpiece is firmly clamped to prevent movement during drilling. Use appropriate cutting fluid or coolant for hard and work-hardening materials to extend tool life, noting this bit does not support coolant-through delivery. Inspection and replacement of worn bits should follow the shop's standard tooling maintenance schedule.