Precision Twist Drill 5999109 Jobber Drill Bit 55 Hss

Product Description

The PRECISION TWIST DRILL 5999109 is a jobber-length drill bit in wire gauge size 55, designed for general-purpose drilling in a wide range of materials. It measures 0.0520 inches in decimal diameter and features a standard 118-degree split point with a web-thinned, tapered web for cleaner entry. The bit is made from high speed steel (HSS) with a bright, uncoated finish. Two spiral flutes with a regular helix evacuate chips efficiently. The straight-cylindrical shank seats securely in standard drill chucks. This bit is suited for use by machinists, maintenance technicians, and fabricators working in production or field environments.

This drill bit is appropriate for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and other hard materials. The 17xD flute-to-diameter ratio and 7/8-inch flute length support controlled drilling at shallow-to-moderate depths. It fits standard drill chucks without modification and is well-suited for benchtop drill presses, hand drills, and CNC drilling operations where wire-gauge precision is required.

Key Features

• Wire gauge size 55 — 0.0520-inch decimal diameter for precision small-hole drilling
• 118-degree standard point angle with web-thinned, tapered web for clean entry
• High speed steel construction for general-purpose durability across multiple materials
• Two spiral flutes, regular helix, for efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks
• Meets ANSI standards — Series R10P, R15P, R18P

Compatibility

Designed as a general-purpose jobber-length drill bit for use in standard drill chucks accepting a 0.0520-inch straight-cylindrical shank. Compatible with drill presses, hand drills, and CNC equipment configured for wire-gauge tooling.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or technicians familiar with small-diameter drill tooling. Secure the shank fully in the chuck and verify concentricity before drilling to prevent bit deflection or breakage at this diameter. Apply consistent, light feed pressure — small wire-gauge bits are susceptible to breakage under lateral load or excessive feed rate. Use appropriate cutting fluid for steel and stainless steel applications to extend bit life and improve hole quality.