Precision Twist Drill 5996098 Cobalt Drill Bit 0.221 in

Product Description

The PRECISION TWIST DRILL 5996098 is a screw machine length cobalt drill bit designed for drilling into hard and abrasive materials where standard high-speed steel bits wear prematurely. Built to the M41CO series specification, this bit features a 135-degree split point that reduces walking and requires no center punch on most surfaces. The straight-cylindrical shank seats securely in standard drill chucks. At 2-7/16 inches overall length with a 1-5/16 inch flute length, the stub-length geometry provides rigidity and minimizes deflection in short-reach drilling applications. Machinists, tool-and-die workers, and maintenance technicians rely on this style bit for production drilling in tight clearances.

This bit is suited for drilling hard ferrous metals, stainless steel, high-nickel alloys, and other tough workpiece materials where heat buildup and edge wear are primary concerns. The screw machine length profile fits standard drill presses, CNC machining centers, and hand-held drill motors with 3/8-inch or larger chucks. The 2.5xD flute-to-diameter ratio supports chip evacuation at moderate feed rates. Wire size 2 corresponds to 0.221 inches, placing this bit in the 0.2000 to 0.2500 inch diameter range. It is sold individually with no minimum order beyond one unit.

Key Features

• M41 cobalt steel construction handles elevated cutting temperatures in hard and stainless materials
• 135-degree split point reduces thrust force and eliminates center-punch requirement on most setups
• Web-thinned, tapered web geometry improves chip flow and reduces torque demand
• Screw machine (stub) length provides extra rigidity and reduced deflection versus jobber-length bits
• Right-hand spiral flute with regular helix evacuates chips efficiently during through-hole drilling
• Meets ANSI standards for dimensional accuracy and heavy-duty grade performance

Compatibility

Designed as a direct-fit replacement or working bit for any application requiring a 0.221 inch diameter, straight-shank drill bit in screw machine length. Compatible with standard drill chucks accepting straight-cylindrical shanks in this diameter range.

Installation Notes

Installation and use of this drill bit should be performed by machinists or qualified trades personnel familiar with metal-cutting operations. Secure the shank fully in the chuck and verify runout before drilling. Use appropriate cutting fluid or coolant when drilling hard ferrous or stainless materials to extend tool life, noting that this bit does not support through-tool coolant. Follow ANSI B11 machine tool safety guidelines and wear appropriate eye protection during all drilling operations.