Precision Twist Drill 5995956 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5995956 is a screw machine length cobalt drill bit designed for high-performance drilling in hard and tough materials. At 11/32 inch (0.3438 inches) in diameter with a 135-degree split point, it cuts aggressively and centers accurately without a pilot hole. The overall length is 3 inches, and the flute length measures 1-11/16 inches, making it well suited for close-quarters drilling operations. The M40CO cobalt grade construction provides heat resistance and edge retention when drilling through hardened steels, stainless, and other demanding workpiece materials. Right-hand cut with a regular spiral flute and straight-cylindrical shank complete the setup for standard drill chuck compatibility.

This drill bit is intended for use in machine shop, maintenance, and fabrication environments where standard high-speed steel bits fall short. The screw machine length format reduces overhang and deflection in drill press, CNC, and turret lathe applications. Its web-thinned, tapered web configuration reduces thrust load and improves chip evacuation. The 2.5xD flute-to-diameter ratio suits moderate-depth holes. Professionals working with hard materials, stainless alloys, and high-strength fastener stock will find this bit appropriate for both production and maintenance drilling tasks.

Key Features

• M40CO cobalt grade construction for heat resistance and extended tool life in hard materials
• 135-degree split point for self-centering entry and reduced thrust
• Web-thinned, tapered web for improved chip clearance and lower feed force
• Screw machine length (3 inches overall) minimizes deflection in tight or machine-mounted applications
• Straight-cylindrical shank fits standard 3-jaw drill chucks without adapters
• Meets ANSI standards for dimensional accuracy and performance classification

Compatibility

Designed as a heavy-duty OEM-style replacement or working drill bit for use in standard drill chucks and collets accepting a straight-cylindrical shank in the 11/32 inch diameter range. Rated for primary use on hard materials per manufacturer specification.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance professionals familiar with drill press, hand drill, or CNC lathe operations. Secure the straight-cylindrical shank firmly in a properly sized drill chuck before operation, and verify spindle speed is appropriate for the workpiece material and bit diameter. Do not exceed the bit's rated capacity by forcing feed rate in materials beyond its listed workpiece range. Use appropriate cutting fluid or coolant when drilling hard alloys to preserve edge life, noting that this bit does not have a coolant-through design.