Greenlee 73BB Round Standard Knockout Punch Set

Greenlee 73BB Round Standard Knockout Punch Set

The Greenlee 73BB Round Standard Knockout Punch Set is a complete punch unit consisting of a punch, die, and draw stud designed for creating clean, fast, and accurate round holes in electrical enclosures and panels. Built for use with battery-powered, hydraulic, ratchet, or manual drivers, this punch set is rated for a capacity of 10 GA (3.500 MM) in mild steel. When properly assembled through pilot holes, the Greenlee 73BB delivers consistent, professional-grade results for electricians and panel fabricators who demand precision on every job.

Key Features

• Complete Punch Unit: Includes punch, die, and draw stud for a ready-to-use knockout solution, eliminating the need to source components separately.
• Standard Round Knockout Type: Engineered to produce round holes that accept common conduit and connector fittings in electrical panels and enclosures.
• Mild Steel Capacity: Rated for 10 GA (3.500 MM) mild steel, giving installers confidence when punching through standard enclosure and panel material.
• Versatile Driver Compatibility: Works with battery-powered, hydraulic, ratchet, or manual drivers, making it adaptable to whatever driver setup is already on the job or in the truck.
• Alignment Markings: Integrated alignment markings improve punching accuracy and productivity, helping installers make precise holes on the first attempt.
• Clear Part Identification: Punches and dies are marked with catalog numbers and sizes for quick identification, reducing downtime when matching components in the field.
• Pilot Hole Assembly: When properly assembled through pilot holes, the unit produces clean, fast, and accurate holes with minimal burring or deformation.

Technical Specifications

• Includes: Punch, Die And Draw Stud
• Type: Standard Round Knockout
• Capacity Mild Steel: 10 GA (3.500 MM)

Typical Applications

• Electrical Panel and Enclosure Fabrication
• Conduit and Connector Knockout Installation
• Commercial and Industrial Electrical Installations
• Panelboard and Load Center Modifications
• Field Retrofit and Renovation Work

Why Greenlee?

Greenlee's 73BB knockout punch set is built as a complete, precision-marked assembly so electricians and panel builders can rely on clean, accurate holes every time. With clear catalog and size markings, alignment features, and compatibility across multiple driver types, the Greenlee 73BB is designed to keep professionals productive and precise on demanding electrical installation and fabrication jobs.