Greenlee 7506 Hydraulic Knockout Set 21 Piece Round Punch

Product Description

The GREENLEE 7506 is a 21-piece hydraulic knockout set designed for punching clean, round conduit holes in mild steel panels, enclosures, and electrical boxes. Powered by a hydraulic hand pump, the set drives round punches through steel up to 10 gauge, covering conduit sizes from 22.5 inches to 61.5 inches punch hole diameter. It is the standard tool for electricians and electrical contractors who need consistent, burr-free knockouts in sheet metal without the fatigue of manual punches. The included high-pressure hose and spacer allow flexible positioning in tight or awkward panel layouts.

The GREENLEE 7506 is suited for commercial and residential electrical work where multiple conduit entries are required in enclosures, sub-panels, junction boxes, and similar metallic structures. Electricians use this set when they need to produce multiple knockouts in a single job without burning through manual punch time. The 21-piece kit includes punches and dies for 1/2 inch and 3/4 inch conduit sizes, as well as a 1 inch conduit size punch, making it applicable across the most common trade conduit entry requirements.

Key Features

• Hydraulic operation reduces operator effort compared to manual punch sets
• Round punch profile produces clean conduit knockouts in mild steel up to 10 gauge
• Punch hole diameter range: 22.5 inches to 61.5 inches across included punches and dies
• 21-piece kit includes hydraulic hand pump, high-pressure hose (1/4 inch x 3 ft), medium spacer, and multiple punch and die pairs
• Includes punches and dies for 1/2 inch, 3/4 inch, and 1 inch conduit sizes
• High-pressure hose provides working flexibility in confined panel spaces

Compatibility

Designed for use with standard round conduit knockout applications in mild steel enclosures and panels up to 10 gauge. Included components are GREENLEE part numbers: 03249 Spacer-Medium, 06302 High Pressure Hose 1/4 in x 3 ft, 13284 Hydraulic Hand Pump, 28154 1/2 in Conduit Size Punch, 28155 1/2 in Conduit Size Die, 28156 3/4 in Conduit Size Punch, 28157 3/4 in Conduit Size Die, and 28158 1 in Conduit Size Punch.

Installation Notes

This tool is installed and operated by licensed electricians following applicable NEC requirements for conduit entries. Before punching, de-energize and lock out any panel or enclosure that is or could be live. Ensure the punch, die, and draw stud are properly aligned and seated before applying hydraulic pressure. Do not exceed the rated material gauge capacity, as overloading can damage punches, dies, or the hydraulic components.