Greenlee 745H-3 Round Knockout Punch Unit 3.539 in 10 Ga

Product Description

The GREENLEE 745H-3 is a round knockout punch unit designed for cutting clean, precise holes in electrical enclosures, panel boxes, junction boxes, and conduit bodies. It produces a 3.539-inch diameter hole up to 3 inches in hole length through mild steel up to 10 gauge. The punch is steel construction and operates with battery-powered or hydraulic tools, making it compatible with common Greenlee hydraulic and cordless knockout drive systems. Licensed electricians and electrical contractors use this unit for conduit entry and fitting installations where a factory-quality hole is required.

This knockout punch unit is suited for residential and commercial electrical work where large-diameter conduit knockouts are needed. Typical applications include pulling conduit entries into load centers, sub-panels, meter sockets, NEMA enclosures, and wireway sections. The 3.539-inch hole diameter accommodates standard trade-size conduit fittings. It is used in new construction, service upgrades, and industrial panel fabrication where consistent hole geometry and clean edges are critical to fitting alignment and code-compliant installation.

Key Features

• 3.539-inch (89.90 mm) round hole diameter for large conduit and fitting entries
• 3-inch hole length accommodates panel walls and enclosure material thickness
• Rated for mild steel up to 10 gauge maximum capacity
• Compatible with battery-operated and hydraulic knockout drive methods
• Steel punch construction for durability through repeated use
• Kit includes die, draw stud, and punch — ready for immediate use

Compatibility

Designed for use with battery-operated and hydraulic knockout drivers. Verify driver compatibility with your specific knockout tool platform before installation. No specific model compatibility data was provided by the manufacturer for this listing.

Installation Notes

Installation should be performed by a qualified electrician in accordance with applicable NEC requirements. De-energize and lock out all panels or enclosures before cutting. Ensure the punch, die, and draw stud are fully seated and aligned before applying hydraulic or battery drive force. Inspect the punch and die for wear or damage before each use to avoid incomplete cuts or edge deformation.