B-Line Eaton series Type 1 junction boxes, 12" height, 4" length, 10" width, 1, Screw cover, SC NK enclosure, Surface mounted, Small single door, No

No. The 12104 SC NK is a NEMA Type 1 enclosure, which is indoor use only and offers no protection against rain, dust, or hosedown. For wet or outdoor locations you need a Type 3R, 4, or 4X box instead. Type 1 is fine for dry indoor electrical rooms, mechanical spaces, and above-ceiling junctions.

It measures 12 inches high, 10 inches wide, and 4 inches deep. The 4 inch depth is the number to check first if you are stacking terminal blocks or bringing in large conduit bodies, since it limits how much wire bending space you have behind the cover.

No knockouts. The 12104 SC NK is a no-knockout box, so every conduit entry has to be punched or hole-sawed in the field wherever your run lands. That is an advantage on a job where the conduit layout is not standard, but plan the labor for it. If you want factory knockouts, order the knockout version of the same size box rather than this NK model.

Yes, it carries UL 50 certification, the standard for enclosures for electrical equipment. That plus the Type 1 rating is generally what an inspector or a spec writer is looking for on an indoor junction box. It is also made in the US.

It is a screw cover with plated screws, and the cover has keyhole slots so you can back the screws out partway and lift the cover off without removing them completely, or rehang it one-handed while you start the screws. Practical difference versus a hinged door box: the screw cover is more tamper-resistant but slower to open, so use a hinged-door enclosure if you expect frequent access.

Surface mounting through thru holes in the back of the enclosure. You supply the anchors or fasteners to suit the substrate (concrete, block, stud, or Unistrut), since the box ships with the holes provided and no anchors. At 7.3 pounds empty it is a two-anchor-minimum wall hang for most substrates, more once it is full of conductors.

Carbon steel at 16 gauge, painted ANSI 61 grey. ANSI 61 is the standard grey used across most industrial control and junction enclosures, so it will read as a match next to typical panel and gutter finishes in the same room. The 16 gauge body holds its shape when you are drilling conduit entries and tightening bushings.

Eaton B-Line part number 12104 SC NK. The number reads as the dimensions first (12 high by 10 wide by 4 deep), then SC for screw cover and NK for no knockouts. Same B-Line numbering logic applies across the size range, so 12104 with a different suffix is the same box with a different cover or knockout arrangement.

It works as a pull or junction box for indoor dry-location runs, and the no-knockout back and sides let you place entries exactly where the conduit lands. Where it falls short is depth: at 4 inches, large-diameter feeder conduit with angle pulls can run out of required bending space fast. For big feeders size the box off your conduit diameter and step up to a deeper enclosure rather than forcing it into this one.