Precision Twist Drill 5998354 Wire 77 Hss Drill Bit

Product Description

The PRECISION TWIST DRILL 5998354 is a jobber-length twist drill bit sized to wire gauge 77, with a decimal diameter of 0.0180 inches. Built from high speed steel with a bright uncoated finish, it features a standard 118-degree split point and a two-flute regular spiral configuration. The straight cylindrical shank measures 0.0180 inches in diameter with a shank length of 11/16 inches. Overall length is 7/8 inches. This bit is a general-purpose drilling tool intended for use by machinists, toolroom technicians, and precision metalworking professionals who require small-diameter accuracy in production or maintenance environments.

This bit is rated for drilling steel, cast iron, non-ferrous metals, superalloys, and titanium. With a flute-to-diameter ratio of 10xD and a maximum drilling depth of 3/16 inches, it suits shallow precision holes in both manual and CNC drilling applications. The web-thinned, tapered web design reduces thrust force when entering tough materials. It conforms to ANSI standards and carries a Series R10H-R18H designation. Typical use cases include fixture work, small fastener hole prep, and precision component fabrication in shop or field settings.

Key Features

• Wire gauge size 77 with a decimal diameter of 0.0180 inches for precise small-hole work
• 118-degree standard drill point for general-purpose entry across multiple materials
• High speed steel construction handles steel, cast iron, non-ferrous metals, superalloys, and titanium
• Web-thinned tapered web reduces thrust and improves penetration in harder workpieces
• Right-hand cut, two-flute regular spiral for consistent chip evacuation in shallow drilling
• Straight cylindrical shank for use in standard drill chucks without modification
• ANSI-compliant construction to Series R10H-R18H specification

Compatibility

Designed as an OEM-style replacement or production-use drill bit compatible with standard drill chucks and collets accepting a 0.0180-inch straight cylindrical shank. Suitable for manual drill presses, CNC machining centers, and handheld precision drilling tools.

Installation Notes

Installation and use should be performed by qualified machinists or metalworking technicians familiar with small-diameter drill bit handling. Secure the shank fully in the chuck before operation to prevent runout. Do not exceed the recommended maximum drilling depth of 3/16 inches per pass. When drilling superalloys or titanium, use appropriate cutting fluid to extend tool life and maintain hole quality.