Precision Twist Drill 5998321 Jobber Drill Bit 76

Product Description

The PRECISION TWIST DRILL 5998321 is a jobber-length twist drill bit sized to wire gauge 76, with a decimal diameter of 0.0200 inches and an overall length of 7/8 inch (0.875 inches). Manufactured from high-speed steel (HSS) with a bright, uncoated finish, this bit is built for general-purpose drilling in ferrous and non-ferrous materials. The standard 118-degree split-point geometry with web-thinning reduces walking and lowers thrust force at entry. It is rated under ANSI standards and belongs to the R10H-R18H series. Designed for precise small-diameter hole work, this bit is a reliable daily-use tool for machinists and trade professionals requiring accurate micro-diameter drilling.

This drill bit is suited for drilling in steel, cast iron, non-ferrous metals, superalloys, and titanium. Its 0.0200-inch diameter makes it appropriate for tapping prep holes, instrument work, small-fixture fabrication, and precision machining applications where tight tolerances are required. The straight cylindrical shank fits standard Jacobs-style chucks and collet holders capable of gripping at the 0.0200-inch shank diameter. It is appropriate for use in machine-shop environments, light manufacturing, and field service applications involving small-bore work.

Key Features

• Wire gauge size 76 with 0.0200-inch decimal diameter for precise micro-diameter drilling
• High-speed steel construction provides heat resistance and edge retention across ferrous and non-ferrous workpieces
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust and improved chip clearance
• Spiral flute, regular-helix design with 2 flutes and a 3/16-inch (0.1875-inch) maximum drilling depth
• Bright uncoated finish suitable for general-purpose applications without additional lubricity coating
• ANSI-compliant jobber-length geometry in the R10H-R18H series

Compatibility

Designed as an OEM-style general-purpose jobber drill bit compatible with standard drill chucks and collet systems that accept a 0.0200-inch straight cylindrical shank. Suitable for use in drill presses, CNC machining centers, and hand-held power drills with appropriately rated chucks.

Installation Notes

This bit should be installed by a machinist or qualified trade professional using a properly rated chuck or collet that matches the 0.0200-inch shank diameter. Ensure the workpiece is securely fixtured before drilling to prevent bit deflection or breakage at this small diameter. Use cutting fluid appropriate for the workpiece material to extend tool life and reduce heat buildup. Replace the bit at the first sign of dulling, as small-diameter HSS bits are susceptible to breakage when forced through hardened or work-hardened material.