Manufacturer Resources
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?
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.