Greenlee 520856 Slug-Buster Knockout Punch, 1-1/2" Conduit Size

Greenlee 520856 Slug-Buster Knockout Punch, 1-1/2" Conduit Size

The Greenlee 520856 Slug-Buster Knockout Punch is a 1-1/2" conduit size punch built for fast, clean knockout creation in electrical enclosures, panels, and boxes. Designed to replace the legacy 721-1-1/2P, this round punch is optimized for mild steel with limited stainless steel capability, giving electricians and panel builders a dependable tool for producing precise conduit openings on the job site or in the shop. Its round profile matches standard 1-1/2" conduit fittings for a consistent, professional-grade knockout every time, and it is manufactured in the US to Greenlee's Slug-Buster engineering standard so panel shops get repeatable, code-compliant results across every unit produced.

Key Features

• Trade Size: 1-1/2" conduit size punch for standard electrical enclosure and panel knockouts.
• Round Profile: Produces a clean, round knockout sized for 1-1/2" conduit and fittings.
• Material Capacity: Optimized for mild steel; punches 10 ga mild steel or 12 ga stainless steel with limited stainless steel capability.
• Direct Replacement: Replaces the Greenlee 721-1-1/2P punch, making it a straightforward upgrade or replacement part for existing Slug-Buster tooling.
• Slug-Buster® Design: Engineered as part of the Greenlee Slug-Buster punch line for reliable slug removal and clean-edged knockouts.
• Country of Origin: Manufactured in the US.

Technical Specifications

• Product Type: Slug-Buster® Punch
• Country Of Origin: US
• Product Shape: Round
• Capacity: Optimized for mild steel. Limited stainless steel capability
• Thickness: Punch 10 ga mild steel or 12 ga stainless steel
• Trade Size: 1-1/2" conduit size

Typical Applications

• Electrical Panel and Enclosure Fabrication
• Conduit Knockout Creation in Junction Boxes
• Panelboard and Load Center Modification
• Replacement Tooling for Existing Slug-Buster Punch Sets
• Commercial and Industrial Electrical Installations

Why Greenlee?

Greenlee's Slug-Buster line is engineered to punch clean, precise knockouts through mild steel with dependable slug removal, and the 520856 continues that standard as a direct replacement for the 721-1-1/2P. For electricians and panel shops that need a 1-1/2" round punch they can rely on job after job, the Greenlee 520856 delivers consistent, code-compliant results built from proven Slug-Buster engineering and US manufacturing.