B-Line Eaton series Type 1 junction boxes, 18" height, 4" length, 12" width, 1, Screw cover, SC NK enclosure, Surface mounted, Medium single door, No

No. The 18124 SC NK carries a NEMA Type 1 rating, which is indoor, dry-location use only, for protection against incidental contact and falling dirt. It offers no protection against rain, hose-down, dust or oil. For an outdoor or wet location you need a NEMA 3R, 4 or 4X enclosure instead.

18 inches high, 12 inches wide, and 4 inches deep. That 4 inch depth is the number to check first if you are stacking terminal blocks, DIN rail components or making up large conductors, since it sets your available wiring space behind the cover.

No knockouts. The NK in the model designation means no knockout, so the box ships blank and you punch or drill your own conduit entries where the run needs them. Plan on a step bit or knockout punch on site. If you want factory conduit openings, you need a knockout version rather than an NK box.

It is a surface mount enclosure with thru holes in the back pan, so you fasten it directly through the box into the wall or strut. Because the fasteners pass through the back, the anchors or bolts are selected to suit your substrate (drywall with backing, masonry, Unistrut) and are not part of the box. Thru holes also mean the back wall is penetrated, which is acceptable for a Type 1 indoor box but not for a sealed enclosure.

The cover is a screw-on type retained with plated screws, and it has keyhole slots so you can back the screws out part way and lift the cover off without fully removing every screw. That keeps a 11.5 lb enclosure manageable for a single installer working overhead. It is not a hinged door, so budget space in front of the box to set the cover down.

The body is carbon steel at 16 gauge, painted in ANSI 61 grey. That is standard commercial enclosure wall thickness and takes drilling, punching and fastener pull-through without deforming. The painted finish suits indoor industrial and mechanical spaces; for corrosive or wet areas you would move to stainless or a coated NEMA 4X box.

Yes, the finish is ANSI 61 grey paint, the standard grey used across most industrial control and enclosure lines, so it reads the same as existing gear on a wall of panels. Handy if you are standardizing look across a plant or a multi-building portfolio.