Precision Twist Drill 5999868 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999868 is a reduced shank twist drill bit built for general-purpose drilling in ferrous metals and a wide range of secondary materials. It features a 1-11/64 inch (1.1719 inch decimal) cutting diameter paired with a 1/2 inch straight-cylindrical reduced shank, allowing it to fit standard 1/2 inch drill chucks while boring larger-diameter holes. The 118-degree standard point angle provides reliable starting and consistent hole geometry. Constructed from high speed steel with a bright uncoated finish, this bit is suited for job site and shop use where frequent resharpening is expected. Machinists, pipefitters, and HVAC fabricators reach for this style of bit when working with steel plate, pipe, and structural stock.

This bit is used in both residential and commercial trade applications where holes larger than 1/2 inch are required but only a 1/2 inch chuck is available. Typical scenarios include sheet metal fabrication, structural steel drilling, and mechanical rough-in work. The 3 inch flute length supports a maximum drilling depth of 3 inches, making it appropriate for through-drilling on standard material thicknesses encountered in mechanical and electrical trade work. Secondary workpiece materials include aluminum, copper, magnesium, nickel, titanium, and synthetic materials, giving it broad cross-trade utility.

Key Features

• 1-11/64 inch cutting diameter (1.1719 inch decimal) with 1/2 inch reduced shank for standard chuck compatibility
• 118-degree standard point angle for accurate starting on flat and curved metal surfaces
• High speed steel construction supports resharpening and withstands moderate heat buildup
• 3 inch spiral flute length with 6 inch overall length — 4xD flute-to-diameter ratio for efficient chip evacuation
• Right-hand cut, bright uncoated finish — no coolant required for general-purpose use
• Meets ANSI standards; Series R56 designation

Compatibility

Designed for use in 1/2 inch keyed or keyless drill chucks. Suitable for drilling ferrous metal, aluminum, copper, magnesium, nickel, titanium, and synthetic materials. No specific OEM model compatibility is stated by the manufacturer for this SKU.

Installation Notes

This bit is installed and operated by machinists, pipefitters, electricians, and HVAC fabricators using a corded drill, drill press, or magnetic base drill. Secure the 1/2 inch shank fully in the chuck before operation and verify chuck key is removed before starting the spindle. Use appropriate cutting fluid or lubricant when drilling ferrous metals to extend bit life, even though the bit is rated for dry use. Inspect the cutting edges before each use and resharpen or replace when the point shows visible wear to prevent overheating and wandering.