Greenlee 28157 Slug-Splitter S...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$46.66
Greenlee 28157 Slug-Splitter SC Round Knockout Die

Greenlee 28157 Slug-Splitter SC Round Knockout Die

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Model: 28157

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

$46.66
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Greenlee 28157 Slug-Splitter SC Round Knockout Die

The Greenlee Slug-Splitter SC® round knockout die family is engineered for self-centering accuracy when punching clean round openings in electrical enclosures, panels, and boxes. This die line is available in sizes from 3/4" through 2" (including 1", 1-1/4", and 1-1/2"), giving electricians and panel fabricators a consistent, repeatable punching solution across common conduit and connector openings. Designed for use with battery-powered, hydraulic, and ram-style knockout drivers, these dies are rated to punch through material up through 10 gauge stainless steel, making them a dependable choice for demanding commercial and industrial electrical work where accuracy and durability matter. Whether you're preparing openings for conduit fittings, connectors, or enclosure hardware, the Slug-Splitter SC® design keeps the die centered on the pilot hole for faster setup and cleaner cuts.

Key Features

  • Size Range: Available across a family of round knockout sizes from 3/4" up to 2", covering standard conduit and fitting hole requirements.
  • Self-Centering Design: Slug-Splitter SC® construction speeds setup and improves punch accuracy by keeping the die centered on the pilot hole.
  • Broad Driver Compatibility: Works with battery-powered, hydraulic, and ram knockout drivers for flexible use across job-site tooling.
  • Heavy-Duty Capacity: Rated to punch through material up to 10 gauge stainless steel, supporting demanding enclosure and panel fabrication.
  • Round Shape: Produces a clean round knockout suited to standard conduit and connector openings.
  • Series: Part of the Slug Splitter® SC line, built for repeatable performance across the size range.

Technical Specifications

  • Sub Brand: Slug Splitter® SC
  • Country of Origin: United States
  • Shape: Round
  • Size Range: 3/4", 1", 1-1/4", 1-1/2", 2"
  • Material Capacity: Up through 10 gauge stainless steel

Typical Applications

  • Punching Round Knockouts in Electrical Enclosures and Panels
  • Commercial and Industrial Electrical Installations
  • Stainless Steel Enclosure Fabrication
  • Conduit and Fitting Opening Preparation
  • Use with Battery-Powered, Hydraulic, or Ram Knockout Drivers

Why Greenlee?

Greenlee's Slug-Splitter SC® knockout dies are built for self-centering accuracy and heavy-duty capacity, punching through material up through 10 gauge stainless steel with consistent, clean round holes across the full 3/4" to 2" size range. Manufactured in the United States, this die family is engineered for compatibility with battery-powered, hydraulic, and ram drivers, giving electrical professionals dependable, repeatable performance on demanding enclosure and panel work no matter which size the job calls for.

Manufacturer Resources

Spec Sheet

Product Specs

list_batch:
GREE-20260923
Product Type:
Knockout Die
Configuration:
Round
Series:
Slug Splitter SC
Country Of Origin:
United States
Department:
Electrical
Product Subgroup:
Knockout Punches
Product Material:
Stainless Steel
Product Group:
Electrical Installation Tools

Greenlee 28157 – Frequently Asked Questions

1) What sizes does the Greenlee Slug-Splitter SC round knockout die come in?
Five trade sizes cover 3/4 inch through 2 inch: 3/4 inch (28157), 1 inch (28159), 1-1/4 inch (28161), 1-1/2 inch (28163) and 2 inch (28165). Those are the conduit trade sizes, so the hole each one cuts accepts the matching conduit fitting or connector rather than measuring that diameter across the cut.
2) Will a Slug-Splitter SC knockout die punch stainless steel enclosures?
Yes. The Slug-Splitter SC round dies are rated to punch material up through 10 gauge stainless steel, which covers the usual stainless panel and enclosure work as well as thinner mild steel and aluminum boxes. Anything heavier than 10 ga stainless is past the rated capacity.
3) Do these Greenlee dies work with a battery hydraulic knockout driver, or do I need a manual ram?
Both work. The Slug-Splitter SC dies are built for use with battery-powered, hydraulic, and ram-style knockout drivers, so the same die set runs off a cordless punch tool or a hand-pump hydraulic ram.
4) Is the Greenlee 28157 a complete punch and die set or just one piece?
The 28157 is the 3/4 inch round knockout die in Greenlee's Slug-Splitter SC line, sold as a single size. If you need to cover a range of conduit openings on one job, order the individual sizes you need: 1 inch (28159), 1-1/4 inch (28161), 1-1/2 inch (28163), 2 inch (28165). A driver and draw stud are separate tooling.
5) Will a round knockout die work for a square or rectangular connector cutout?
No. The Slug-Splitter SC in this size range is a round configuration only, producing a clean round hole for conduit fittings, connectors and enclosure hardware. For square cutouts or rectangular device openings you need a square or rectangular punch and die rather than this round family.
6) Which knockout die size do I order for 1-1/4 inch EMT?
Order the 1-1/4 inch die, Greenlee 28161. Knockout dies are called out by conduit trade size, so a 1-1/4 inch die cuts the opening that a 1-1/4 inch EMT connector or fitting seats into.
7) What does the self-centering feature on the Slug-Splitter SC actually do on the job?
The SC design holds the die centered on the pilot hole you drill for the draw stud, so the punch does not wander off center as it bites. That matters most on panel fabrication where several holes have to line up with a connector pattern, and it cuts setup time compared with eyeballing the alignment on each hole.
8) Are Greenlee Slug-Splitter SC dies made in the USA? We have domestic sourcing requirements.
Yes, the Slug-Splitter SC round knockout dies are manufactured in the United States, which is what institutional and government buyers with domestic preference language usually need confirmed before they issue the PO.
How fast can I get the Greenlee 28157 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 28157 come with a warranty?
Absolutely. The Greenlee 28157 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 28157?
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 28157 from ZenSupply?
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