Precision Twist Drill 010021 Hss Jobber Drill Bit 21/64 in

Product Description

The PRECISION TWIST DRILL 010021 is a high-speed steel (HSS) jobber-series drill bit built for demanding drilling applications in hard materials. With a tip diameter of 21/64 inches and a depth of cut reaching 4 inches, this bit is sized for deep-hole work where standard-length bits fall short. HSS construction allows the bit to retain hardness at elevated temperatures, making it suitable for sustained use on ferrous metals, cast iron, and similarly tough workpieces. Machinists, pipefitters, and fabricators will find this bit well-suited to production and field drilling tasks where heat and mechanical stress are routine concerns.

This jobber drill bit is intended for use in general-purpose metal drilling applications across residential and commercial jobsites, fabrication shops, and maintenance environments. The jobber-length format provides a balance of rigidity and reach, making it a practical choice for drilling through structural steel, pipe, plate, and similar hard-surface materials. It is sold individually and is compatible with standard drill chucks that accept a 21/64-inch shank.

Key Features

• High-speed steel construction retains cutting hardness under extreme heat and force
• 21/64 inches tip diameter for precise, consistent hole sizing
• 4 inches depth of cut supports deep-hole drilling applications
• Overall length of 4-5/8 inches in standard jobber format
• Designed for drilling hard surfaces including ferrous metals and similar materials

Compatibility

Designed as a standard jobber-series drill bit compatible with conventional drill chucks and drill presses accepting a 21/64-inch diameter bit shank.

Installation Notes

This bit is installed and used by machinists, pipefitters, electricians, and general trade professionals performing metal drilling operations. Secure the bit firmly in the chuck before use and verify the workpiece is properly clamped or fixtured. Use appropriate cutting fluid or lubricant when drilling ferrous metals to extend bit life and manage heat. Inspect the cutting edges for wear or damage before each use and replace the bit if chipping or dulling is observed.

Technical Specifications

• Series: HSS Jobber
• Tip Diameter: 21/64 inches
• Depth of Cut: 4 inches
• Overall Length: 4-5/8 inches
• Material: High-Speed Steel (HSS)
• Weight: 0.45 pounds
• UPC: 086071100214

Standard Information

• Brand: PRECISION TWIST DRILL
• Manufacturer Part Number: 010021