Greenlee 52066040 Speed KO Kit...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,998.36
$1,948.36
Greenlee 52066040 SPEED KO KIT, CONDUIT 2-1/2X4'

Greenlee 52066040 Speed KO Kit, 2-1/2" x 4" Knockout Punch Set

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Model: 52066040
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,998.36
$1,948.36
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Greenlee 52066040 Speed KO Kit, 2-1/2" x 4" Conduit Knockout Punch Set

The Greenlee 52066040 Speed KO Kit is a professional-grade knockout punch set sized for 2-1/2" and 4" conduit openings, purpose-built for electricians who need fast, clean knockouts in mild steel enclosures, panels, and boxes. Finished in durable black oxide, this kit is rated to punch mild steel up to 10 gauge (3.0 mm) and ships in a rugged plastic storage case for jobsite organization and protection. Designed and assembled in the US, the 52066040 kit delivers the round, consistent knockouts electrical contractors depend on for reliable conduit terminations on commercial and industrial job sites.

Key Features

  • Knockout Sizes: Punches 2-1/2" and 4" conduit knockouts, covering common panel and enclosure sizing needs for larger conduit runs.
  • Durable Construction: Black oxide finish resists corrosion and wear across repeated punching cycles, extending tool life in daily jobsite use.
  • Cutting Capacity: Rated to punch mild steel up to 10 gauge (3.0 mm) thickness, matching the material commonly used in enclosures and panels.
  • Kit Packaging: Includes a plastic storage case that keeps all punch components organized and protected between jobs and during transport.
  • Kit Dimensions: Case measures 17.000 IN length x 16.200 IN width x 4.600 IN height for compact, organized jobsite storage.
  • Country of Origin: Manufactured in the US for consistent quality control and reliable performance.

Technical Specifications

  • Capacity Mild Steel: Max 10 gauge (3.0 mm).
  • Country Of Origin: US
  • Package: Plastic Storage Case
  • Product Height: 4.600 IN
  • Product Length: 17.000 IN
  • Product Material: Black Oxide Finish
  • Product Type: Knockout Punches
  • Product Width: 16.200 IN

Typical Applications

  • Electrical Panel and Enclosure Fabrication
  • Conduit Termination Prep in Mild Steel Boxes
  • Commercial and Industrial Electrical Installations
  • Panelboard and Switchgear Modification
  • New Construction and Retrofit Electrical Work

Why Greenlee?

Greenlee builds knockout punch tools trusted by electrical professionals for consistent, clean cuts through mild steel enclosures and panels. The black oxide finish and rated 10 gauge (3.0 mm) mild steel cutting capacity of the 52066040 kit reflect Greenlee's focus on durable, jobsite-ready tooling, while the included plastic storage case keeps the full 2-1/2" and 4" punch set organized and ready for the next installation. US-based manufacturing supports the consistent fit and finish contractors expect from their conduit knockout tools.

Manufacturer Resources

Spec Sheet

Product Specs

Capacity Mild Steel:
Max: 10 gauge (3.0 mm).
Country Of Origin:
US
Package:
Plastic Storage Case
Product Height:
4.600 IN
Product Length:
17.000 IN
Product Material:
Black Oxide Finish
Product Type:
Knockout Punches
Product Width:
16.200 IN
Volume:
24.64 LB
Department:
Electrical
Product Subgroup:
Knockout Punches

Greenlee 52066040 – Frequently Asked Questions

1) What conduit sizes does the Greenlee 52066040 Speed Punch kit cover?
The 52066040 kit carries one punch and die each in 2-1/2, 3, 3-1/2 and 4 inch U.S. conduit sizes, plus one 3/4 inch Speed Lock. The finished holes run 2.914 inches (74.0 mm) up to 4.544 inches (115.4 mm), which are the oversize holes conduit hubs and fittings in those trade sizes need.
2) What pilot hole do I need to drill before using these large conduit knockout punches?
Two different pilot sizes, depending on which punch you grab. The 2-1/2 and 3 inch punches need a 7/8 inch (22.2 mm) pilot hole; the 3-1/2 and 4 inch punches need a 1-1/4 inch (31.8 mm) pilot. Drill the wrong one and the draw stud will not pass through the panel.
3) Will this Greenlee conduit punch kit go through 10 gauge steel enclosure walls?
Yes, 10 gauge (3.0 mm) mild steel is the maximum rated capacity. It also punches aluminum, fiberglass and plastic, so it covers typical sheet steel panels, gutters, and non-metallic enclosures. Anything heavier than 10 gauge steel is outside the rating.
4) Does the Greenlee 52066040 kit include the hydraulic driver, or do I need to buy that separately?
Driver is separate. The kit is punches, dies and a 3/4 inch Speed Lock in a plastic storage case. Greenlee recommends running it with the 746 hydraulic ram and 767 hand pump. Budget for that ram and pump if you do not already have them on the truck.
5) Can I buy just one punch if I wear out the 3 inch in this Greenlee set?
Yes, the punches are sold individually as replacement parts: 7212SP-2-1/2P for 2-1/2 inch, 7212SP-3P for 3 inch, and 7212SP-3-1/2P for 3-1/2 inch. That matters for an MRO crib standardizing on this kit, since one damaged punch does not force a whole new set.
6) Is a knockout punch the right tool for cutting 4 inch conduit holes, or should I use a hole saw?
For enclosure and panel work up to 10 gauge mild steel, the punch is the cleaner route: it shears a round, burr-free hole in one hydraulic stroke with no chips thrown into live gear and no wandering pilot. A hole saw in 10 gauge steel at 4 inches is slow, grabs, and leaves an edge you have to dress. The trade-off is the up-front pilot hole, 7/8 or 1-1/4 inch depending on punch size, and the need for a ram and pump.
7) How big is the Greenlee Speed Punch conduit kit case and what does it weigh for truck stock?
The cased kit measures 17 inches long by 16.2 inches wide by 4.6 inches high and comes in at 24.64 lb. It is a two-hand carry, so plan shelf space in the van rather than a top tray.
8) What finish are the Greenlee 52066040 punches and dies, and where are they made?
Black oxide finish on the tooling, made in the US. The black oxide helps with corrosion resistance on tools that live in a damp gang box between jobs.
How fast can I get the Greenlee 52066040 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 52066040 come with a warranty?
Absolutely. The Greenlee 52066040 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 52066040?
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 52066040 from ZenSupply?
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