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Manufacturer Resources
53151 3/4 Spec Sheet
Product Specs
- Extension Ring:
- Y
- Cubic Capacity:
- 21 Cubic Inches
- Product Color:
- Silver
- Levelling Height:
- 101.6mm
- Product Material:
- Steel
- Standards:
- UL E2969
- Number Of Outlet:
- 1
- Product Shape:
- Square
- Product Group:
- Boxes & Enclosures
- Product Size:
- 4 Inches Length x 4 Inches Width x 1-1/2 Inches Depth
- Product Details:
- Extension Rings
- Unspsc:
- 39121320 Electrical box extension
- Product Type:
- Box Extension Ring
- Department:
- Electrical
- Product Subgroup:
- Electrical Boxes
- Product Width:
- 101.6mm
Steel City 531511/2-30 – Frequently Asked Questions
1) Will a Steel City 4 inch square extension ring fit a standard 4 inch square junction box?
Yes. The Steel City 53151 extension ring measures 4 inches by 4 inches with a 1-1/2 inch depth, so it mounts to the face of any standard 4 inch square steel box and keeps the same 4 x 4 footprint for your cover or device ring.
2) How much extra box fill does a 4 inch square 1-1/2 inch deep extension ring add?
It adds 21 cubic inches of volume. That is what you count toward box fill when you are over capacity on conductors, splices, or devices in the existing 4 inch square box, and it is the usual fix when a box is crowded but the wall opening cannot change.
3) Which knockout size should I order on the Steel City 53151 extension ring?
Three knockout configurations are offered: 1/2 inch only (53151 1/2-30), 3/4 inch only (53151 3/4), and a combination 1/2 inch and 3/4 inch (53151 1/2 3/4). Pick by the trade size of the conduit or connector you are landing on the ring. The combination version gives you both options on one part, which is the one most crews stock when a job mixes 1/2 and 3/4 inch runs.
4) Can I use an extension ring to bring a recessed box flush with new drywall or tile?
That is exactly what it does. The ring bolts onto the existing box and extends the opening forward 1-1/2 inches, which covers most added layers of drywall, backer, or tile without pulling and resetting the box. Steel construction, so it keeps the assembly mechanically solid and bondable.
5) Should I use an extension ring or a deeper junction box?
If the box is already set in the wall and wired, the extension ring is the shorter path: it adds 21 cubic inches and 1-1/2 inches of depth without disturbing the existing conduit terminations. If you are roughing in new work and know the fill up front, a deeper 4 inch square box is a single part and one less joint. Retrofit and remodel work almost always goes to the ring.
How fast can I get the Steel City 531511/2-30 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 Steel City 531511/2-30 come with a warranty?
Absolutely. The Steel City 531511/2-30 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 Steel City 531511/2-30?
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 Steel City 531511/2-30 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.