Bsc Preferred QJDIB-DB-029A Black Oxide Drill Bit 21/64

Product Description

The BSC PREFERRED QJDIB-DB-029A is a 21/64-inch black oxide drill bit precision-ground from high-speed steel for general-purpose drilling across a range of materials. The 135-degree split point eliminates bit walking, allowing accurate hole placement without center-punching. A corrosion-resistant black oxide finish extends service life in shop and field environments. The reinforced core resists breakage under lateral load, making this bit a reliable choice for electricians, plumbers, HVAC techs, and general contractors who drill frequently into metal, wood, and plastic on the job.

This drill bit is suited for drilling angle iron, structural steel, wood framing, and PVC pipe or conduit. Its 21/64-inch diameter makes it a common size for bolt clearance holes and pilot applications in light fabrication and trade work. The high-speed steel construction handles intermittent use in hand drills and drill presses without rapid edge degradation.

Key Features

• 135-degree split point prevents walking for accurate, no-punch starts
• Black oxide finish provides corrosion resistance in humid or outdoor environments
• Precision-ground high-speed steel maintains a sharp cutting edge longer than standard carbon steel
• Reinforced core geometry resists breakage under lateral stress
• Suitable for metal, wood, angle iron, and PVC applications

Compatibility

Designed as a general-purpose replacement or stock drill bit compatible with standard 3-jaw drill chucks accepting 21/64-inch shank sizes, including hand drills and bench drill presses common in trade and light industrial use.

Installation Notes

Installation is performed by licensed tradespeople or experienced technicians using a standard drill or drill press. Always secure the workpiece before drilling and use appropriate cutting fluid when drilling ferrous metal to extend bit life. Wear eye protection at all times. Inspect the cutting edge before each use and replace if chipped or dull to prevent workpiece damage or bit failure.