Pass & Seymour S4421SAC 4-in S...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$60.72
$10.68
Pass & Seymour S4421SAC 4-in Square Junction Box, Thermoplastic

Pass & Seymour S4421SAC 4-in Square Junction Box, Thermoplastic

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Model: S44-21-SAC

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

$60.72
$10.68
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Pass & Seymour S4421SAC 4-in Square Junction Box, Thermoplastic

The Pass & Seymour S4421SAC is a 4-in square box built for fast, reliable rough-in work. Molded from impact-resistant thermoplastic, this box features threaded mounting holes for straightforward device and fixture attachment, plus Auto/Clamps on each end that eliminate the need for separate cable clamps. It is UL Listed, making it a dependable choice for residential and commercial electrical installations where a durable, code-compliant junction box is required.

Key Features

  • Trade Size: 4-in square box footprint sized for standard junction and outlet box applications.
  • Durable Construction: Molded from impact-resistant thermoplastic for long-term durability and resistance to cracking or deformation during installation.
  • Integral Cable Clamps: Auto/Clamps on each end of the box eliminate the need for separate cable clamps, reducing part count and installation time.
  • Threaded Mounting Holes: Pre-threaded holes allow devices, covers, and fixtures to be secured directly without additional hardware prep.
  • Easy Installation: Rectangular cutout design simplifies mounting and speeds up rough-in work on the jobsite.

Certifications & Compliance

  • UL Listed

Technical Specifications

  • Country Of Origin: United States
  • Product Color: Gray
  • Product Line: Pass & Seymour

Typical Applications

  • Residential and Commercial Electrical Rough-In
  • Junction and Outlet Box for Device Mounting
  • Wall and Ceiling Box Installations
  • New Construction and Remodel Wiring
  • General-Purpose Cable Splicing and Termination

Why Pass & Seymour?

Pass & Seymour builds electrical devices and boxes engineered for consistent, code-compliant performance on the jobsite. The S4421SAC's impact-resistant thermoplastic body, integral Auto/Clamps, and UL Listing reflect the kind of practical, durable design professional electricians rely on for efficient, dependable installations.

Manufacturer Resources

Spec Sheet

Product Specs

Product Material:
Thermoplastic
Product Type:
Junction Box
Product Color:
Gray
Listing:
UL Listed
Country Of Origin:
United States
Department:
Electrical
Product Group:
Boxes & Enclosures
Product Subgroup:
Electrical Boxes
Product Length:
4.25 in
Product Width:
4.25 in
Product Depth:
1.5 in

Pass & Seymour S44-21-SAC – Frequently Asked Questions

1) Does the Pass & Seymour S4421SAC 4-inch square box have built-in cable clamps, or do I need to add clamps?
No separate clamps needed. The S4421SAC has Auto/Clamps molded into each end of the box, so NM cable lands directly without buying and installing separate clamps. That cuts part count on a rough-in where you're setting boxes by the dozen.
2) Is a non-metallic 4-inch square box like the S4421SAC acceptable for commercial work, or do I need steel?
The Pass & Seymour S4421SAC is UL Listed and the manufacturer calls it out for both residential and commercial electrical installations. Where a job spec or an inspector calls for metal boxes, or where you need to bond the box itself as part of an equipment grounding path, go steel instead. ZenSupply carries the Orbit D4SB 1-1/2 inch deep drawn steel 4 inch square and the Orbit 4SDB welded steel square deep box with 1 inch knockouts for those openings.
3) Can I use the Pass & Seymour S4421SAC outdoors or in a washdown area?
The S4421SAC is a UL Listed thermoplastic box intended for residential and commercial rough-in, device mounting, and general cable splicing in wall and ceiling locations. For a wet, outdoor, or washdown environment, step to a sealed enclosure instead: the Rittal 80181 JB series is a hinged-cover junction box rated IP66 / NEMA 4X. Use the S4421SAC for dry interior rough-in and the JB series where the enclosure has to keep water out.
4) What is the closest steel equivalent to the Pass & Seymour S4421SAC 4-in square box?
If you need a 4-inch square box in metal rather than plastic, the Orbit D4SB series is a 1-1/2 inch deep 4-inch square junction box in drawn steel, sold in packs of 100. The S4421SAC is molded thermoplastic with integral Auto/Clamps on each end and threaded mounting holes, so the steel D4SB will generally need separate cable connectors at the knockouts. Choose the thermoplastic S4421SAC where a non-metallic box is wanted, and the drawn steel D4SB where the box is being bonded as part of a metallic raceway or MC run.
5) I need more wiring volume than a standard 4-inch square box gives me - what should I use instead?
For deeper capacity in the same 4-inch square footprint, the Orbit 4SDB series is a welded steel square deep box with 1-inch knockouts. If the splice count is the issue rather than the footprint, the Carlon E987R is a 6 x 6 x 4 inch polycarbonate screw-cover junction box, which gives you a much larger pull and splice volume than a 4-inch square. The S4421SAC remains the right pick when you are mounting a device or fixture, since it has threaded mounting holes for direct device and cover attachment.
6) Can I mount a device or a fixture directly to the S4421SAC thermoplastic box without extra hardware?
The box comes with pre-threaded mounting holes, so devices, covers, and fixtures screw straight in. There's no tapping or added hardware prep at the box itself. You still select the cover or mud ring separately for the device you're installing.
7) What's the difference between a 4-inch square box like the S4421SAC and a PVC junction box with a screw cover?
Two different jobs. The S4421SAC is a 4 inch square rough-in box with integral cable clamps and threaded holes, meant to be set in a wall or ceiling and finished with a cover or ring for a device. A screw-cover PVC or polycarbonate box, like the Cantex E983G non-metallic family or the Cantex 5133690 4-1/8 inch box with a 1/2 inch knockout and cover, is a self-contained pull or splice enclosure that ships with its own cover and is typically surface mounted on conduit.
8) Does the Pass & Seymour S4421SAC come with a cover?
The S4421SAC is sold as the box itself, with Auto/Clamps and threaded mounting holes. Order the flat cover, blank plate, or mud ring for the device you're installing separately. If you want a box that arrives with its cover, the Cantex 5133690 4-1/8 inch junction box includes one.
9) How does the Cantex 5133690 junction box differ from the Pass & Seymour S4421SAC?
The Cantex 5133690 is a 4-1/8 inch junction box supplied with a 1/2 inch knockout and a cover, so it ships as a closed splice box. The Pass & Seymour S4421SAC is a 4-inch square box with Auto/Clamps on each end and threaded mounting holes, sized for standard junction and outlet box applications where a device, cover, or fixture is screwed on afterward. If you want the cover in the same box, the Cantex is the one; if you are landing a device or fixture, the S4421SAC's threaded holes do that directly.
10) Is a PVC junction box a direct substitute for the Pass & Seymour S4421SAC?
Not always. The Cantex E983G is a non-metallic PVC junction box family, and like the S4421SAC it is a non-metallic body, so neither requires bonding of the box itself. The difference is in how cable is secured and how devices attach: the S4421SAC is molded thermoplastic with integral Auto/Clamps on each end that remove the need for separate cable clamps, plus threaded mounting holes for devices and covers. Confirm the PVC box offers the clamping and device prep your opening needs before treating it as a one-for-one swap.
11) For a multi-unit property where I am standardizing boxes across many units, is the S4421SAC or the Orbit D4SB the better fleet choice?
Both are 4-inch square boxes. The Orbit D4SB is drawn steel, 1-1/2 inch deep, and sold in packs of 100, which suits bulk standardization on metallic wiring methods. The Pass & Seymour S4421SAC is gray impact-resistant thermoplastic, UL Listed, made in the United States, with Auto/Clamps on each end so no separate cable clamps are stocked alongside it - fewer loose parts to carry per unit. Pick based on the wiring method your units use: non-metallic cable favors the thermoplastic box, metallic raceway favors the steel.
12) What is the Pass & Seymour S4421SAC box made of and what color is it?
It's molded impact-resistant thermoplastic in gray. The thermoplastic body resists cracking when you're nailing boxes to studs and takes abuse during rough-in better than brittle plastics.
13) What part number and UPC do I order for the Pass & Seymour 4-inch square thermoplastic box?
Manufacturer part number S44-21-SAC, catalog model S4421SAC, UPC 785007207385. It's made in the United States.
How fast can I get the Pass & Seymour S44-21-SAC 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 Pass & Seymour S44-21-SAC come with a warranty?
Absolutely. The Pass & Seymour S44-21-SAC 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 Pass & Seymour S44-21-SAC?
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 Pass & Seymour S44-21-SAC from ZenSupply?
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