Greenlee 745H-3-1/2 Knockout Punch Unit 4.011 in Round

Product Description

The GREENLEE 745H-3-1/2 is a round knockout punch unit designed for cutting clean, precise conduit holes in electrical enclosures, panels, and junction boxes. It produces a 4.011-inch diameter hole at 3.5 inches in depth and is rated for a maximum of 10 gauge mild steel. Compatible with battery-operated and hydraulic knockout drivers, this unit gives electricians a fast, burr-free hole without drilling or grinding. The kit includes the die, draw stud, punch, and sleeve, so the installer has everything needed to complete the knockout in a single operation.

This knockout punch unit is suited for commercial and industrial electrical installations where large-diameter conduit entries are required. Typical applications include cutting 3.5-inch trade-size conduit knockouts in steel enclosures, switchgear panels, and distribution boxes. The battery and hydraulic operating compatibility makes it a practical choice on job sites where both driver types are in use. Licensed electricians and electrical contractors are the primary installers of this unit.

Key Features

• Produces a 4.011-inch (102.70 mm) round knockout hole
• Rated for 10 gauge maximum capacity in mild steel
• Compatible with battery-operated and hydraulic knockout drivers
• 3.5-inch hole length for deep-reach knockout applications
• Steel punch construction for durability under repeated use
• Includes die, draw stud, punch, and sleeve — complete unit, no additional components required

Compatibility

Designed for use with GREENLEE battery-operated and hydraulic knockout driver systems. Refer to the driver manufacturer specifications to confirm stud thread and driver capacity compatibility before use.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the enclosure or panel before beginning any knockout work. Ensure the draw stud is fully seated and the die is properly aligned before applying hydraulic or battery drive force. Do not exceed the rated 10 gauge mild steel capacity, as overloading the punch can damage the tooling or cause unsafe conditions.