Precision Twist Drill 5995981 Cobalt Drill Bit 47/64

Product Description

The PRECISION TWIST DRILL 5995981 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and abrasive materials. Sized at 47/64 inch (0.7344 inches) in diameter, it features a 135-degree split point that reduces walking and allows the bit to engage the workpiece quickly without a center punch. The straight-cylindrical shank seats securely in standard drill chucks. Web thinning with a tapered web configuration reduces thrust requirements and improves chip evacuation. This is a heavy-duty tool rated for demanding production and maintenance drilling applications.

This bit is suited for drilling hard metals, alloys, and other tough workpiece materials where standard high-speed steel bits wear prematurely. The screw machine length profile — shorter than jobber length — provides added rigidity and reduces deflection in drill press, turret lathe, and CNC machining center setups. The right-hand spiral flute geometry and regular spiral type support consistent chip removal. It conforms to ANSI standards and carries an M40 material grade designation, placing it in the high-cobalt category appropriate for production-level cutting duty. Sold individually.

Key Features

• 47/64 inch (0.7344 inches) diameter with 5-inch overall length and 3-1/8-inch flute length
• 135-degree split point reduces walking and lowers required thrust force
• Cobalt construction (M40 grade) resists heat and wear in hard material applications
• Screw machine length body provides increased rigidity over jobber-length bits
• Web-thinned tapered web improves chip flow and reduces cutting resistance
• Straight-cylindrical shank compatible with standard drill chucks; right-hand cut

Compatibility

Designed for use in drill presses, turret lathes, and CNC machining centers where screw machine length cobalt drill bits in the 0.6000 inch and larger diameter range are specified. Conforms to ANSI standards per Series M40CO designation.

Installation Notes

Installation and use of this bit should be performed by a qualified machinist or tool operator familiar with metal-cutting operations. Secure the shank fully in the chuck or collet and verify runout before cutting. Always wear appropriate eye and hand protection when operating drilling equipment. Follow machine manufacturer speed and feed guidelines for cobalt tooling in hard materials; excessive feed rate will shorten tool life.