Greenlee 4-1/2" Standard Round...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,047.53
Greenlee 4-1/2" Standard Round Knockout Punch Set with Draw Stud Assembly

Greenlee 4-1/2" Standard Round Knockout Punch Set with Draw Stud Assembly

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Model: 742BB
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,047.53
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Greenlee 4-1/2" Standard Round Knockout Punch Set with Draw Stud Assembly

Professional Knockout Punching for Clean, Accurate Holes

The Greenlee 4-1/2" Standard Round Knockout Punch Set delivers professional-grade hole punching capability for electrical installations and metalworking applications. This complete punch unit includes punch, die, and draw stud components for reliable performance through mild steel up to 10 GA thickness. Designed for use with battery-powered, hydraulic, ratchet, or manual drivers, this knockout punch set provides the versatility and precision required for professional electrical work.

Professional Features & Benefits

  • 10 GA Mild Steel Capacity: Handles substantial material thickness for demanding electrical and construction applications
  • Complete Unit Design: Includes punch, die, and draw stud for immediate use without additional components needed
  • Catalog Number Marking: Punches and dies are clearly marked with sizes for quick identification and inventory management
  • Alignment Markings: Improve punching accuracy and productivity when making precise holes in electrical panels and enclosures
  • Multi-Driver Compatibility: Works with battery-powered, hydraulic, ratchet, or manual drivers for flexible operation
  • Clean Hole Production: Properly assembled through pilot holes to create fast, accurate, and clean knockout holes

Technical Specifications

  • Capacity Mild Steel: 10 GA (3.500 MM)
  • Includes: Punch, Die And Draw Stud
  • Product Size: 4-1/2 IN (115.400 MM)
  • Product Type: Standard Round Knockout
  • Product Weight: 11.400 LB (5172.000 G)
  • Replacement Part: 2984AV UPC 04655 Punch, 2983AV UPC 04654 Die, 3026AV UPC Draw 04679 Stud and 3036AVBB UPC04685 Ball

Professional Applications

  • Electrical Panel Modifications
  • Conduit and Cable Entry Points
  • Industrial Equipment Installation
  • Commercial Electrical Work
  • Maintenance and Repair Operations
  • Metal Fabrication Projects

Why Choose Greenlee Quality?

Greenlee knockout punch sets are built for professional reliability with durable construction and precision engineering. The complete unit design with marked components ensures consistent performance and easy identification, while the robust 11.4 lb construction provides the stability needed for accurate hole punching in demanding applications.

Manufacturer Resources

Product Specs

Capacity Mild Steel:
10 GA (3.500 MM)
Includes:
Punch, Die And Draw Stud
Product Size:
4-1/2 IN (115.400 MM)
Product Type:
Standard Round Knockout
Product Weight:
11.400 LB (5172.000 G)
Department:
Electrical
Product Subgroup:
Tool Replacement Parts

Greenlee 742BB – Frequently Asked Questions

1) What size hole does the Greenlee 742BB knockout punch cut?
The Greenlee 742BB cuts a 4-1/2 inch (115.4 mm) standard round hole. That is the bare hole size, so match it to the conduit or fitting body you are running, not to the trade size on the box.
2) How thick a panel can the Greenlee 742BB punch through?
Rated for mild steel up to 10 gauge (3.5 mm). That covers typical electrical panel sides, enclosures, and junction box walls. Heavier or harder plate is outside what this punch unit is rated for.
3) Does the Greenlee 742BB come with everything needed, or do I have to buy a draw stud separately?
It ships as a complete unit: punch, die, and draw stud. You still need a driver to pull it, and you need to drill the pilot hole for the draw stud first.
4) Can I use this 4-1/2 inch knockout punch with a battery hydraulic driver, or is it manual only?
Either works. The 742BB set is built to be driven by battery-powered, hydraulic, ratchet, or manual drivers. At 4-1/2 inches through 10 gauge steel, a powered driver is the practical choice on a panel job; a manual wrench is slow work at this diameter.
5) If I wear out the punch or die on a Greenlee 742BB, can I replace just that piece?
Yes, the components are sold individually. The punch is 2984AV, the die is 2983AV, the draw stud is 3026AV, and the ball is 3036AVBB. Punches and dies are stamped with their catalog numbers and sizes, so you can confirm what you are holding before ordering a replacement.
6) Will the Greenlee 742BB cut a square or a conduit-shaped hole?
No. It is a standard round knockout punch and cuts a round 4-1/2 inch hole only. For square, rectangular, or D-shaped openings you need a punch of that specific shape, not this unit.
7) How heavy is the Greenlee 742BB punch set to carry up a ladder?
The set weighs 11.4 lb (5,172 g). That is a two-hand item on a lift or scaffold, and worth planning for if you are punching an enclosure overhead rather than on the bench.
8) How do I keep the hole from wandering off center when punching a large knockout?
The punch and die carry alignment markings meant to line the assembly up before you draw it. Drill the pilot hole for the draw stud on the layout mark, seat the die against the back of the panel, and bring the punch up square. Working through a properly located pilot hole is what produces a clean cut at this diameter.
How fast can I get the Greenlee 742BB delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Greenlee 742BB come with a warranty?
Absolutely. The Greenlee 742BB is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Greenlee 742BB?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Greenlee 742BB from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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