Precision Twist Drill 5998078 Wire 64 Hss Drill Bit

Product Description

The PRECISION TWIST DRILL 5998078 is a jobber-length drill bit in wire gauge size 64, equivalent to 0.0360 inches in diameter. Manufactured from high speed steel (HSS) with a bright, uncoated finish, it is designed for general-purpose drilling in steel, cast iron, non-ferrous metals, superalloys, and titanium. The bit features a standard 118-degree point angle, a regular spiral flute pattern, and a web-thinned, tapered web configuration that reduces thrust and improves chip evacuation. Overall length is 1.5 inches with a 5/8-inch flute length. This is a precision small-diameter bit used by machinists, maintenance technicians, and metalworking tradespeople in production and field applications.

The 5998078 is suited for drilling small-diameter holes in metallic substrates across both light manufacturing and maintenance-repair-operations (MRO) environments. Its straight cylindrical shank seats directly into standard drill chucks and collets without modification. With a 17xD flute-to-diameter ratio and a maximum drilling depth of 5/8 inch, it performs well in shallow-hole drilling tasks where tight dimensional tolerances are required. The right-hand cut direction is compatible with standard clockwise-rotation drilling equipment. It conforms to ANSI standards and falls within the R10H-R18H series designation from Precision Twist Drill.

Key Features

• Wire gauge size 64 (0.0360 inches) for precision small-diameter hole making
• High speed steel construction for durability across steel, cast iron, non-ferrous metals, superalloys, and titanium
• 118-degree standard point angle with web-thinned tapered web for reduced entry thrust
• Regular spiral, 2-flute design promotes efficient chip removal in shallow holes
• Bright uncoated finish compatible with cutting fluids and dry drilling applications
• Conforms to ANSI standards, Series R10H-R18H

Compatibility

Designed as a general-purpose jobber-length drill bit for use with standard drill chucks and collets accepting a 0.0360-inch straight cylindrical shank. Suitable for drilling steel, cast iron, non-ferrous metals, superalloys, and titanium as listed in the product specifications.

Installation Notes

Installation and use should be performed by qualified machinists or tradespeople familiar with small-diameter drill bit handling. Secure the straight shank fully in the chuck or collet before operation to prevent bit walking or breakage. At this diameter, low feed pressure and appropriate RPM are critical to avoid bit deflection or fracture. Use a center punch mark or spot drill to locate the hole before drilling when working on hard or curved surfaces.