B-Line Eaton series Type 1 junction boxes, 18" height, 6" length, 18" width, 1, Hinged cover, HC NK enclosure, Surface mounted, Medium single door, T

The 18126 HC NK enclosure measures 18 inches high, 18 inches wide and 6 inches deep, so it gives you a square 18 x 18 face with 6 inches of gutter depth behind the door. That depth is what decides whether your conduit bends, terminal blocks or wire bundle will sit without fighting the cover, so check your deepest device before committing.

No. This is a NEMA Type 1 enclosure, which is indoor use only and protects against incidental contact with the enclosed equipment and falling dirt. It offers no rating against rain, hose-down, dust ingress or corrosive environments. For an exterior wall, a mechanical room with washdown, or anywhere water is present, you need a Type 3R, 4 or 4X box instead.

Blank. The NK in the model designation means no knockouts, so the carbon steel walls come solid and you drill or punch your own conduit openings exactly where the run lands. That is the usual choice on a field-terminated pull or junction box where the knockout pattern would never match the raceway layout anyway. Budget for a step bit or knockout punch set in the 16 gauge wall.

Surface mount, using thru holes in the back of the enclosure. You fasten straight through the back panel into the wall, strut or backboard with your own hardware sized to the substrate; no mounting feet or flanges are involved. At 13.3 pounds empty, plus whatever wire and devices go in it, anchor into studs, masonry or Unistrut rather than drywall alone. It is not a flush or recessed box.

Hinged, on a medium single door. You swing it open for access rather than lifting a screw-on plate off and finding somewhere to set it down, which matters when you are working alone on a wall-mounted box at height. The cover is also removable if you want it off the hinge entirely, and it has a recessed pull ring plus a friction dimple to hold it shut.

It carries UL 50, the standard covering enclosures for electrical equipment. Finish is painted carbon steel in ANSI 61 grey, the standard gear grey, so it will match adjacent panelboards, control cabinets and pull boxes already in that color on the same job. Made in the US.

Order it as Eaton B-Line 18126 HC NK. The number reads as the dimensions, 18 high by 18 wide by 6 deep, followed by HC for hinged cover and NK for no knockouts. Give a distributor that full string, because the same 18126 body is built in other cover and knockout configurations.

16 gauge carbon steel is the common commercial and light industrial body weight for a box this size, stiff enough to resist denting from cart traffic or a dropped tool in a mechanical room, loading dock or back-of-house corridor. It is heavy enough to hold a clean knockout when you punch it, and the painted finish protects the steel in dry indoor spaces. For corrosive or wet process areas, move to a stainless or non-metallic enclosure instead.