Steel City 641 1-G FLUSH SVC FLR-BX 35CU HUB

Two hub sizes: 3/4 inch (model 641) and 1 inch (model 641 1). The hub is threaded, so you run rigid or IMC conduit directly into the box rather than using connectors in a knockout. Pick the size to match the conduit already stubbed to the location.

No. The 641 has zero knockouts, so the threaded hub is the only entry. If you need multiple feeds or a through-run in the same box, this is the wrong body for the job.

35 cubic inches. That is the number you use for conductor fill counting under the box-fill rules, and it covers a single device with a feed in and a splice without crowding. For a bigger fill you would step up to something like the Wiremold 880W1, a 1-gang steel floor box rated at 53 cubic inches.

The Steel City 641 is a 35 cubic inch cast iron flush service box, which needs real depth in the slab or wood floor. For thin pours and retrofit cuts in existing floors, Wiremold offers shallow single-gang steel boxes: the 880M1 OmniBox single gang shallow steel floor box and the 885B in the 880 Series as a shallow steel single service box. Confirm your available depth below the finished floor before choosing.

The Steel City 641 is a cast iron single-gang flush service floor box with 35 cubic inches of wiring volume. If the device and conductor count needs more room, the Wiremold 880W1 is a steel 1-gang floor box rated at 53 cubic inches. Both are single-gang, so the device opening stays the same; the difference is body material and internal volume for conductor fill.

The Steel City 641 is a cast iron body with a threaded hub, sized 3/4 inch or 1 inch. If the job is specified for nonmetallic raceway, the Pass and Seymour TM1542 series floor box is PVC instead of cast metal. Keep in mind a PVC box does not provide a metal raceway bonding path through the box the way a cast iron hub box does, so the equipment grounding method has to be handled in the conductors.

Flush service means the box is set so the cover sits level with the finished floor, no raised housing. One gang, so it takes a single device or a single service fitting. If you want a non-metallic body for a slab pour instead, the Pass and Seymour TM1542 series floor box is PVC.

No. The Steel City 641 is a cast iron flush service box with a threaded 3/4 inch or 1 inch hub and 35 cubic inches of volume; the Wiremold 885B is a shallow steel single service box in the 880 Series and uses Wiremold's own cover and carpet or tile flange hardware. Covers and service plates are not interchangeable between the two, so swapping one for the other means replacing the box and its cover assembly together, not just the box.

The Steel City 641 carries UL listing E2969 and is made in the United States, with a cast iron body and no knockouts, so every entry is through the threaded hub. The Wiremold 880M1 is an OmniBox series shallow steel floor box. Where a submittal calls for a cast iron flush service box fed by threaded conduit, the 641 matches that description; where it calls for a shallow steel OmniBox assembly, the 880M1 is the one named.

Sold each, so you order exactly the count your floor plan calls for rather than a fixed carton quantity. It is also made in the United States, which matters on jobs with domestic sourcing requirements.