Precision Twist Drill 5999285 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999285 is a screw machine length drill bit designed for high-speed steel cutting applications requiring a compact, stub-length profile. Measuring 0.052 inches in diameter with an overall length of 1-5/8 inches and a flute length of 5/8 inch, this bit fits into tight work envelopes where standard-length bits cannot operate. The 118-degree point angle and web-thinned, tapered web construction reduce entry force and improve chip evacuation. Manufactured from high-speed steel with a bright, uncoated finish, it is suited for general-purpose drilling in production and machine shop environments. Machinists and toolroom technicians are the primary installers.

The 5999285 is built for use in screw machines, CNC lathes, drill presses, and similar production equipment where short, rigid tooling is preferred. Its 2.5xD flute-to-diameter ratio and spiral flute geometry support efficient chip removal in repetitive, high-cycle drilling operations. The primary workpiece material rating includes titanium, making it appropriate for aerospace, medical device, and precision machining applications where difficult materials are common. The straight-cylindrical shank provides secure seating in standard chucks and collets.

Key Features

• 0.052-inch diameter wire gauge size #55 for precision small-hole drilling
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust force
• Screw machine (stub) length profile: 1-5/8 inches overall, 5/8 inch flute length
• High-speed steel construction rated for general-purpose and titanium workpiece materials
• Right-hand cut, spiral flute, straight-cylindrical shank compatible with standard chucks and collets
• Meets ANSI standards; Series R41 high-performance designation

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard drill chucks, collets, and toolholders accepting a straight-cylindrical shank in production machining and toolroom equipment.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom technicians familiar with small-diameter drill bit handling. Secure the shank fully in the chuck or collet before operation to prevent runout and bit breakage, which is a significant risk at this diameter. Power down and de-energize the machine before changing tooling. Do not exceed the recommended speed and feed parameters for the workpiece material, as small-diameter bits are sensitive to side loading and deflection.