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RACO 665 Handy Extension Ring, Drawn Steel, 4 in. x 2 in., Eight 1/2 in. KO's
The RACO 665 Handy Extension Ring is a drawn steel box extension built to add usable wiring volume to an existing handy/utility box installation. Sized 4 in. x 2 in. with a 1-7/8 in. deep body, it provides eight 1/2 in. knockouts for flexible conduit entry and ships with no bracket for direct box-to-box mounting. The 665 is cULus Listed, making it a dependable choice for commercial and residential electrical rough-in and renovation work where extra box depth or wiring capacity is required.
Key Features
- Trade Size: 4 in. x 2 in. handy box footprint designed to extend and align with standard handy boxes.
- Durable Construction: One-piece drawn steel body for a seamless, rugged extension ring with no weld seams.
- Extension Depth: 1-7/8 in. (1.875 in.) deep, adding significant usable interior volume for additional wiring or devices.
- Knockouts: Eight 1/2 in. KO's positioned around the ring for flexible conduit or connector entry from multiple directions.
- Bracket Type: No Bracket configuration allows the ring to mount flush and stack directly onto an existing box.
- Listing: cULus Listed for use in compliant commercial and residential electrical installations.
Certifications & Compliance
- cULus Listed
Technical Specifications
- Product Type: Steel Boxes and Covers
- Product Depth: 1.875 in
- Drawn or Welded: Drawn
- Bracket Type: No Bracket
- Certified Listed: cULus Listed
Typical Applications
- Extending Existing Handy or Utility Boxes
- Commercial and Residential Wiring Installations
- Surface-Mounted Device Box Extensions
- Renovation and Remodel Wiring Projects
- Adding Wiring Volume for Additional Conductors or Devices
Why RACO?
RACO builds the 665 Handy Extension Ring from one-piece drawn steel for a strong, seamless enclosure that stands up to the demands of everyday electrical rough-in work. With eight 1/2 in. knockouts, a 1-7/8 in. deep body, and cULus Listing, this extension ring delivers the code-compliant reliability electricians expect when adding capacity to existing box installations.
Manufacturer Resources
Spec Sheet
Product Specs
- list_batch:
- RACO-20260916
- Product Type:
- Box Extension Ring
- Product Depth:
- 1.875 in
- Drawn or Welded:
- Drawn
- Bracket Type:
- No Bracket
- Certified Listed:
- cULus Listed
- Department:
- Electrical
- Product Subgroup:
- Electrical Boxes
- Product Group:
- Boxes & Enclosures
RACO RACO665 – Frequently Asked Questions
1) How much depth does the RACO 665 handy extension ring add to an existing box?
The 665 body is 1-7/8 in. (1.875 in.) deep, so it adds that much depth on top of whatever handy box is already in the wall or on the surface. That is the figure to use when you are checking whether a device and its conductors will still sit behind the cover, or whether a deep device such as a dimmer or a GFCI will clear.
2) What is the difference between the RACO 665 handy extension ring and the Steel City SBEX box extension?
They extend different box footprints. The RACO 665 is a 4 in. x 2 in. handy/utility box extension ring, 1-7/8 in. deep, with eight 1/2 in. knockouts, built from one-piece drawn steel and cULus Listed. The Thomas & Betts SBEX is an adjustable 1-gang switch box extension of 3.5 cu. in. in pre-galvanized steel, so it is sized to a single-gang switch box rather than a handy box. Match the extension to the box already in the wall: handy box, use the 665; 1-gang switch box, use the SBEX.
3) I need to add depth to a single-gang switch box, not a handy box. What should I use instead of the RACO 665?
The RACO 665 is built on the 4 in. x 2 in. handy box footprint and is intended to stack onto an existing handy or utility box, so it will not align with a 1-gang switch box. For that opening, the Thomas & Betts Steel City SBEX is an adjustable 1-gang switch box extension in pre-galvanized steel rated at 3.5 cu. in.
4) I need more conduit entries on an existing handy box. How many knockouts does the RACO 665 have?
Eight 1/2 in. knockouts, placed around the ring so you can bring conduit or connectors in from more than one direction. That makes it a practical fix when the original handy box is out of usable KOs but you need to feed another circuit or run through.
5) Should I use an extension ring or just replace the handy box with a deeper one?
An extension ring like the RACO 665 is the move when the existing box is already set in finished work and you only need more wiring volume or depth. You keep the original box and conductors in place and add 1-7/8 in. of body plus eight more 1/2 in. knockouts. Pulling and replacing the box makes more sense on new rough-in, or when the existing box is damaged or the wrong size for the device entirely.
6) Which extension gives more added wiring volume, the RACO 665 or the Steel City SBEX?
The RACO 665 is the larger of the two: a 4 in. x 2 in. handy footprint with a 1-7/8 in. deep drawn steel body, which adds substantially more interior space than the Steel City SBEX, a 1-gang switch box extension rated at 3.5 cu. in. If the goal is room for additional conductors or a second device behind a surface-mounted handy box, the 665 is the one sized for it.
7) Is the RACO 665 extension ring drawn or welded steel, and does it matter?
Drawn. The 665 is formed from one piece of steel, so there are no weld seams in the body. For an inspector or an MRO buyer the practical difference is a continuous enclosure wall with no seam to split if the ring gets knocked during rough-in or a remodel.
8) Does the RACO 665 come with mounting hardware or a bracket?
No bracket. The 665 is the No Bracket version, intended to mount directly onto the existing box, so plan on using the box-to-box fasteners and the cover you already have for that handy box opening.
How fast can I get the RACO RACO665 delivered?
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Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
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Does the RACO RACO665 come with a warranty?
Absolutely. The RACO RACO665 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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