Precision Twist Drill 5996164 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996164 is a cobalt screw machine length drill bit engineered for high-performance drilling in hard and difficult-to-machine materials. Measuring 0.041 inches in diameter (Wire Size 59) with an overall length of 1.375 inches and a flute length of 0.5 inches, this bit is built for short-reach, high-accuracy applications where rigidity matters. The 135-degree split point reduces walking and entry force, while the web-thinned, tapered web construction improves chip evacuation. It belongs to the M41CO series and is ground to ANSI standards. Licensed machinists, tool-and-die technicians, and maintenance professionals rely on this bit for precision work in production and repair environments.

This drill bit is suited for drilling hard metals and alloys where standard high-speed steel bits lose edge retention. The screw machine length design provides a shorter, stiffer profile compared to jobber-length bits, reducing deflection in tight-clearance setups and CNC fixture work. Its cobalt construction and heavy-duty grade designation make it appropriate for stainless steel, hardened steel, titanium, and similarly demanding workpiece materials. The right-hand spiral flute geometry supports standard chuck mounting on both manual and automated drilling equipment.

Key Features

• Cobalt construction (M41 material grade) for extended tool life in hard materials
• 135-degree split point reduces bit walk and lowers required feed force
• Web-thinned, tapered web promotes efficient chip evacuation
• Screw machine length (1.375 inches overall) provides added rigidity over jobber-length bits
• Right-hand cut with regular spiral flute at 2.5xD flute-to-diameter ratio
• Straight-cylindrical shank fits standard drill chucks without adapters
• Conforms to ANSI standards; heavy-duty grade designation

Compatibility

Designed as an OEM-style replacement or direct-use bit for applications requiring Wire Size 59 (0.041 inches) diameter drilling in hard and high-strength workpiece materials, compatible with any standard drill chuck accepting a straight-cylindrical shank at this diameter.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with drilling speeds and feeds for cobalt tooling in hard materials. Secure the straight-cylindrical shank firmly in a properly sized drill chuck before operation, and verify chuck runout is within acceptable tolerance to protect the small-diameter bit. Do not exceed recommended surface footage for cobalt bits in the target material, as overheating will degrade the cutting edge. Use appropriate cutting fluid or coolant where the workpiece material and setup allow.