Precision Twist Drill 5995940 Cobalt Drill Bit 0.6562 in

Product Description

The PRECISION TWIST DRILL 5995940 is a screw machine length cobalt drill bit designed for high-performance drilling in hard and demanding workpiece materials. Built to ANSI standards, this bit measures 0.6562 inches (21/32 inch) in diameter with a 135-degree split point that reduces walking and lowers thrust on entry. The M40CO-series cobalt construction gives the cutting edge superior heat and wear resistance compared to standard high-speed steel, making it a reliable choice for machinists and maintenance technicians who regularly work ferrous alloys, stainless, and other hard materials. The straight-cylindrical shank seats securely in standard drill chucks and machine spindles without slippage.

This bit is suited for production drilling and maintenance applications where a compact, stub-length tool is preferred over a jobber-length bit. Screw machine length geometry shortens the tool overhang, improves rigidity, and reduces deflection in drill press, turret lathe, and CNC machining center setups. The right-hand spiral flute with a 2.5xD flute-to-diameter ratio evacuates chips efficiently in short-hole drilling cycles. It is appropriate for shops, industrial maintenance facilities, and trade contractors drilling hard materials in tight setups.

Key Features

• 0.6562 inch (21/32 inch) diameter cobalt construction for heat and wear resistance in hard materials
• 135-degree split point reduces drill walking and lowers feed force at entry
• Web-thinned tapered web improves chip clearance and cutting efficiency
• Screw machine (stub) length at 4.5 inches overall reduces deflection and improves rigidity
• Right-hand cut spiral flute with 2.5xD ratio for effective chip evacuation
• Straight-cylindrical shank for compatibility with standard chucks and machine spindles
• Meets ANSI standards; M40 material grade rated for heavy-duty use

Compatibility

Designed as an OEM-style replacement or direct-use screw machine length drill bit for production and maintenance drilling operations on hard workpiece materials, including ferrous alloys and similar difficult-to-machine metals, as specified by the M40CO series designation.

Installation Notes

This bit is installed and operated by machinists and skilled maintenance technicians familiar with drill press, lathe, or CNC equipment setup. Secure the straight-cylindrical shank firmly in a properly sized drill chuck or collet before operation. Inspect the cutting edges and point geometry before each use and remove the bit from service if chipping or excessive wear is observed. Follow applicable shop safety protocols and machine manufacturer guidelines for spindle speed and feed rate selection when drilling hard materials.