Precision Twist Drill 5996150 Screw Machine Drill Bit 55

Product Description

The PRECISION TWIST DRILL 5996150 is a screw machine length cobalt drill bit designed for drilling into hard and demanding workpiece materials. Built to ANSI standards from M41 cobalt high-speed steel, this bit delivers the heat resistance and edge retention needed in production and maintenance drilling environments. It features a 135-degree split point that reduces walking and minimizes the need for a center punch, making it well suited for fast, repeatable hole placement. The straight-cylindrical shank is sized at 0.0520 inches in diameter, and the overall length measures 1.625 inches, making this bit compatible with standard drill chucks used across machining and field applications.

This drill bit is intended for use in screw machine length applications where a shorter, more rigid bit reduces deflection and improves accuracy in tight-tolerance drilling. The cobalt M41 construction makes it appropriate for cutting hard materials including stainless steel, cast iron, titanium alloys, and other high-strength metals. Its 5/8-inch flute length provides adequate chip evacuation for the short-hole depths typical of screw machine work. Machinists, tool-and-die technicians, and field service professionals in fabrication and maintenance environments are the primary users of this type of bit.

Key Features

• Wire size 55 with 0.0520-inch diameter for precision small-hole drilling
• M41 cobalt high-speed steel construction for high-heat and heavy-duty cutting performance
• 135-degree web-thinned split point reduces thrust and eliminates center-punch dependency
• Screw machine length (1.625 inches OAL) provides rigidity and reduces bit deflection
• Right-hand spiral flute with 2.5xD flute-to-diameter ratio for efficient chip removal
• Straight-cylindrical shank fits standard drill chucks without adapters
• Meets ANSI specifications for dimensional accuracy and performance

Compatibility

Designed for use in standard drill chucks accepting a 0.0520-inch straight-cylindrical shank. Suitable for screw machine, CNC, and handheld drilling setups where wire size 55 screw machine length bits are specified. Intended for use in hard workpiece materials as classified in the M41CO series application guidelines.

Installation Notes

This bit is installed and serviced by machinists, toolroom technicians, or maintenance professionals familiar with small-diameter drill bit handling. Secure the shank fully in the drill chuck and verify concentricity before engaging the workpiece. When drilling hard materials, use appropriate cutting fluid or coolant to extend tool life, even though this bit does not have through-coolant capability. Avoid excessive feed pressure on small-diameter bits, as side loading increases the risk of breakage.