Precision Twist Drill 5995983 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5995983 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and abrasive materials. Measuring 5/16 inch (0.3125 inches) in diameter with a 135-degree split point, this bit delivers fast penetration and reduced walking on entry. The web-thinned, tapered web construction lowers thrust requirements and extends tool life in demanding production and maintenance environments. Machined to ANSI standards and designated as the M40CO series, this is a heavy-duty tool suited for use by machinists, industrial maintenance techs, and trade professionals who regularly work with hard stock.

This drill bit is built for screw machine length applications where a shorter, more rigid tool reduces deflection and improves hole accuracy. The 2.5xD flute-to-diameter ratio and spiral flute geometry support efficient chip evacuation during drilling. Its straight-cylindrical shank fits standard drill chucks without adapters, making it compatible with benchtop drill presses, hand drills, and CNC drilling setups. The cobalt construction handles hard materials including stainless steel, hardened alloys, and cast iron where high-speed steel bits wear prematurely.

Key Features

• Cobalt tool material for durability in hard and abrasive workpiece materials
• 135-degree split point reduces entry walking and lowers thrust force
• Web-thinned, tapered web construction for reduced cutting resistance
• Screw machine length (2-13/16 inches overall) for improved rigidity and reduced deflection
• Right-hand cut spiral flute with 2.5xD flute ratio for efficient chip removal
• Straight-cylindrical shank fits standard drill chucks without adapters
• ANSI-standard construction, M40CO series, heavy-duty grade

Compatibility

Designed as an OEM-style screw machine length replacement or production drill bit for use with standard straight-shank drill chucks in hand drills, drill presses, and CNC drilling equipment. Primary workpiece material designation is hard material per manufacturer specification.

Installation Notes

Installation and use of this drill bit is performed by machinists and industrial maintenance technicians. Secure the straight-cylindrical shank fully in the drill chuck and verify chuck tightness before operation. Disconnect power to the drilling equipment before changing bits. Do not exceed the rated capacity of the drill press or hand tool being used, and apply appropriate cutting fluid when drilling hard materials to manage heat buildup.