Import BDNA--22449-1 Jobber Drill Bit 7/16 Inch Hss

Product Description

The IMPORT BDNA--22449-1 is a jobber-length twist drill bit designed for general-purpose drilling in metal, wood, and similar materials. It measures 7/16 inch (0.4375 inch decimal) in diameter with a 5-1/2 inch overall length and a 4-1/16 inch flute length. The bit is manufactured from high speed steel and features a gold oxide coating that provides moderate lubricity and heat resistance during drilling operations. The 118-degree split point reduces walking on entry and lowers the thrust required to start the hole. Web-thinned construction further reduces cutting resistance. This bit is a common choice for HVAC technicians, pipefitters, plumbers, and electricians drilling pilot and clearance holes in sheet metal, structural steel, and framing components.

This drill bit is suited for a wide range of trade applications including drilling clearance holes for fasteners, conduit knockouts, pipe penetrations, and equipment mounting. The straight cylindrical shank with a 3/8 inch diameter fits standard three-jaw drill chucks found on corded and cordless drills as well as drill presses. The right-hand spiral flute efficiently evacuates chips during through-hole drilling. It is appropriate for both shop use and field service work across HVAC, plumbing, and electrical trades.

Key Features

• 7/16 inch (0.4375 inch) diameter with 118-degree split point for accurate, low-thrust entry
• High speed steel construction for general-purpose metal and multi-material drilling
• Gold oxide coating provides lubricity and moderate heat resistance
• Web-thinned, tapered web design reduces cutting resistance and improves chip flow
• Right-hand spiral flute with regular helix for efficient chip evacuation
• Straight cylindrical shank at 3/8 inch diameter fits standard three-jaw chucks

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard three-jaw drill chuck accepting a 3/8 inch straight cylindrical shank, including corded drills, cordless drills, and drill presses.

Installation Notes

Install the shank fully into the chuck and tighten securely before drilling. Always wear appropriate eye protection when drilling metal. Secure the workpiece before starting the cut to prevent spinning. Apply cutting fluid when drilling through hardened steel or thick stock to extend bit life and reduce heat buildup.