Precision Twist Drill 5995969 Cobalt Drill Bit 0.5781 in

Product Description

The PRECISION TWIST DRILL 5995969 is a screw machine length cobalt drill bit designed for high-performance drilling in hard and difficult-to-machine materials. Built to ANSI standards in the M40CO series, it features a 135-degree split point that reduces walking and cutting pressure on entry. The straight-cylindrical shank seats securely in standard drill chucks. Web thinning and a tapered web configuration improve chip evacuation and reduce thrust requirements when drilling tough stock. This bit is suited for machinists, maintenance technicians, and metalworking tradespeople working with hard ferrous and non-ferrous alloys.

The 5995969 is sized at 0.5781 inches (37/64 inch) in diameter with an overall length of 4.125 inches and a flute length of 2.625 inches, placing it in the screw machine length category for use in short-stroke drilling setups, turret lathes, CNC machining centers, and bench drill presses. It is rated as a heavy-duty grade bit intended for production and maintenance environments where standard HSS bits wear prematurely on harder workpiece materials. The 2.5xD flute-to-diameter ratio supports chip clearance in deeper passes.

Key Features

• Cobalt construction for heat resistance and durability when drilling hard materials
• 135-degree split point reduces walking and lowers entry thrust
• Web-thinned, tapered web design improves chip flow and reduces cutting load
• Screw machine length profile fits short-stroke setups and turret lathes
• Right-hand cut with regular spiral flute geometry for standard drilling applications
• Meets ANSI standards; M40 material grade rated for heavy-duty use

Compatibility

Designed as a direct-fit replacement or production drill bit for applications requiring a 37/64 inch (0.5781 inch) diameter hole in hard workpiece materials. Compatible with any drill press, lathe, or machining center accepting a straight-cylindrical shank in the 0.5000 to 0.6000 inch diameter range.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tools. Secure the shank fully in the chuck and verify runout before drilling. Always use appropriate cutting fluid or coolant when drilling hard alloys to manage heat buildup, even though this bit does not support through-coolant. Inspect the cutting edges and split point for wear before each use; a dull cobalt bit generates excessive heat and can damage both the bit and the workpiece.