Precision Twist Drill 5998765 Drill Bit Letter H 17/64 Hss

Product Description

The PRECISION TWIST DRILL 5998765 is a jobber-length drill bit in Letter H (17/64 inch, 0.2660 inch decimal) designed for general-purpose drilling in a wide range of materials. Built from high speed steel with a steam oxide coating, it features a 135-degree split point with web thinning for fast engagement and reduced walking on entry. The straight-cylindrical shank measures 17/64 inch in diameter with a 1.25-inch shank length, and the overall length is 4.125 inches. The regular spiral, two-flute design provides efficient chip evacuation. This bit is suited for use in handheld drills and drill presses and is typically installed by machinists, maintenance technicians, and trade professionals working in fabrication or field service environments.

The 5998765 is rated for drilling into steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium, covering primary workpiece material codes P, M, K, N, and S. The flute length of 2.875 inches allows a maximum drilling depth of 2.875 inches, making it appropriate for through-hole and deep-hole applications in structural components, pipe fittings, brackets, and similar metalwork. It meets ANSI standards and carries NAS 907 specification designation, supporting use in aerospace and heavy-duty industrial applications.

Key Features

• Letter H size — 17/64 inch (0.2660 inch decimal) diameter
• 135-degree split point with web-thinned, tapered web for reduced thrust and self-centering entry
• High speed steel construction with steam oxide coating for lubricity and light corrosion resistance
• Two-flute regular spiral design with 2.875-inch flute length for efficient chip removal
• Straight-cylindrical shank compatible with standard drill chucks
• Meets ANSI standards and NAS 907 specification; rated for P, M, K, N, and S workpiece materials

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with standard 3-jaw drill chucks accepting a 17/64-inch straight-cylindrical shank. Suitable for use in benchtop drill presses, handheld power drills, and drill stations across Series R10B, R15B, and R18B applications.

Installation Notes

Secure the shank firmly in a properly sized drill chuck before operation and verify chuck key is removed before powering the tool. Use appropriate cutting fluid or coolant when drilling stainless steel, superalloys, or titanium to prevent work hardening and premature bit wear. Operate at feed rates and speeds appropriate for the workpiece material and bit diameter in accordance with manufacturer cutting data. Inspect the cutting edge for wear or damage before each use and replace bits that show chipping or dullness to maintain hole quality and safe operation.