Precision Twist Drill 5995950 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5995950 is a cobalt screw machine length drill bit engineered for drilling into hard and tough materials where standard high-speed steel bits fall short. Sized at 27/64 inch (0.4200 inch decimal), it features a 135-degree split point that reduces walking and allows immediate cutting engagement without a center punch. The M40CO series designation indicates a cobalt-alloy construction rated for heavy-duty production and maintenance drilling. The bit measures 3-3/8 inches overall with a 2-inch spiral flute length, a tapered web configuration with web thinning, and a straight-cylindrical shank for standard drill chucks. It is sold individually and meets ANSI standards.

This bit is intended for use on hard workpiece materials including hardened steels, stainless steel, cast iron, and other abrasion-resistant alloys where heat buildup is a concern. The cobalt construction provides higher red-hardness than standard HSS bits, making it well suited for metal fabrication shops, maintenance technicians, pipefitters, and industrial mechanics who drill through tough base metals regularly. The regular spiral flute type at a 2.5xD ratio supports efficient chip evacuation during production drilling runs.

Key Features

• Cobalt M40 alloy construction for high-performance drilling in hard materials
• 135-degree split point reduces thrust and eliminates center-punch requirement
• Web-thinned, tapered web configuration improves cutting efficiency
• Screw machine length (3-3/8 inches overall) provides rigidity and reduced deflection
• Straight-cylindrical shank fits standard 3-jaw drill chucks
• Right-hand cut, regular spiral flute for reliable chip clearance
• Meets ANSI standards for dimensional accuracy and performance

Compatibility

Designed as a heavy-duty OEM-style replacement or production drill bit for use in standard drill chucks accepting straight-cylindrical shanks in the 27/64 inch size range, consistent with the M40CO series and ANSI specifications.

Installation Notes

Installation and use should be performed by qualified machinists, maintenance mechanics, or trade professionals familiar with drilling operations on ferrous and hard-alloy metals. Secure the straight-cylindrical shank fully in a properly rated drill chuck before operation, and verify chuck capacity accommodates the 27/64 inch shank diameter. Use appropriate cutting fluid or coolant when drilling hard materials to extend bit life and manage heat, even though this bit does not feature coolant-through passages. Inspect the cutting edges for wear or chipping before each use and replace when point geometry is compromised to avoid workpiece damage or bit failure.