Precision Twist Drill 5998635 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998635 is a screw machine length drill bit designed for high-performance metal drilling applications. Built from high speed steel with a coated finish, this bit features a 135-degree split point angle and web-thinned, tapered web construction that reduces walking and improves hole entry. At 0.0595 inches in diameter (wire size #53), it is engineered for precision drilling in tight-tolerance work. The straight-cylindrical shank seats securely in standard drill chucks, and the regular spiral flute promotes efficient chip evacuation. This is a heavy duty grade bit suited for machinists, maintenance technicians, and production drilling environments.

The 5998635 is built for use in screw machine and production drilling setups where consistent hole quality in small diameters is required. Its primary rated workpiece material is titanium, making it appropriate for aerospace, medical, and precision machining applications where difficult materials are common. The 2.5xD flute-to-diameter ratio and 5/8-inch flute length are well suited to the shallow-depth drilling typical of screw machine operations. This bit meets ANSI and NAS 907 standards, confirming dimensional and performance compliance for regulated manufacturing environments.

Key Features

• 0.0595 inch diameter, wire size #53, for fine-tolerance hole work
• 135-degree standard point angle with web thinning for reduced thrust and clean entry
• High speed steel construction with coated finish for extended tool life
• Right hand cut with regular spiral flute for reliable chip clearance
• Screw machine length body with 5/8-inch flute length and 1-5/8-inch overall length
• Meets ANSI and NAS 907 specifications for use in regulated production environments

Compatibility

Designed for use in standard drill chucks accepting straight-cylindrical shanks. Rated for primary use in titanium workpieces and suitable for other materials consistent with high speed steel screw machine drill applications.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with small-diameter drill bits. Secure the straight-cylindrical shank fully in a properly sized collet or chuck before operation. Ensure spindle speed and feed rate are appropriate for the workpiece material and bit diameter to prevent breakage. Do not apply side load to the bit during drilling, as small-diameter high speed steel bits are susceptible to deflection and snapping under lateral stress.