Precision Twist Drill 5995974 Cobalt Drill Bit 43/64

Product Description

The PRECISION TWIST DRILL 5995974 is a screw machine length cobalt drill bit designed for high-performance drilling in hard and tough materials. Measuring 0.6719 inches (43/64 inch) in diameter with a 135-degree split point, this bit delivers fast, accurate starts without a center punch. The web-thinned, tapered web construction reduces cutting resistance and improves chip evacuation. Built to ANSI standards in the M40CO series, it is suited for machinists, maintenance technicians, and metalworking professionals who need a durable, short-length bit for production or repair drilling applications.

This bit is designed for drilling hard metals and difficult workpiece materials where standard high-speed steel bits fall short. The screw machine (stub) length provides increased rigidity compared to jobber-length bits, making it well suited for drill press, CNC, and manual machine tool applications. The 2.5xD flute-to-diameter ratio and spiral flute geometry support efficient chip removal during deep-hole passes. It is a practical choice for shops and field technicians working with stainless steel, hardened alloys, and other demanding materials.

Key Features

• Cobalt tool material rated for high-performance cutting in hard and abrasive metals
• 135-degree split point reduces walking and lowers required feed pressure
• Web-thinned, tapered web design improves chip flow and reduces heat buildup
• Screw machine (stub) length increases rigidity and reduces deflection
• Right-hand cut, spiral flute with straight-cylindrical shank for standard chuck compatibility
• Meets ANSI standards; M40CO series, M40 material grade, heavy-duty classification

Compatibility

Designed as an OEM-style replacement or direct-use screw machine length drill bit for applications requiring a straight-cylindrical shank cobalt bit in the 0.6000 inch and above diameter range.

Installation Notes

Installation of this drill bit is performed by machinists or maintenance technicians using a drill press, lathe tailstock, or CNC spindle with a compatible chuck or collet sized for the straight-cylindrical shank. Secure the workpiece firmly before drilling and confirm spindle speed is appropriate for the workpiece material and bit diameter. Cutting fluid or coolant is recommended when drilling hard metals to extend tool life and manage heat, even though this bit does not support coolant-through delivery. Inspect the bit for wear or chipping before each use.