B-Line Eaton series Type 1 junction boxes, 18" height, 6" length, 18" width, 1, Hinged cover, HC enclosure, Surface mounted, Medium single door, 9 to

No. The 18186 HC carries a NEMA Type 1 rating, which is indoor use only, for protection against incidental contact and falling dirt. It offers no protection against water, oil, or dust ingress, so keep it out of exterior walls, wet locations, and washdown zones. For those you need a Type 3R, 4, or 4X enclosure instead.

18 inches high by 18 inches wide with a 6 inch depth. That depth matters most on a surface mount job: at 6 inches you have room to gutter conductors and land splices behind the hinged door, but check your stud or column projection before committing, since the box stands the full 6 inches off the wall face.

Knockouts are already provided: 9 on the top, 9 on the bottom, and 9 on the sides. That covers most multi-conduit pull and splice work without a hole punch, though any opening you do not use must stay in place to keep the Type 1 enclosure intact.

It is a surface mount enclosure with thru holes in the back pan for fasteners. You supply the anchors or machine screws to suit the substrate, concrete, block, unistrut, or wood blocking. At 18.4 lb empty, plus conductors, plan the anchors for real weight rather than drywall-only fixings.

The HC in 18186 HC is the hinged cover. The door swings open instead of coming off in your hands, which is what you want on a box that gets opened repeatedly for troubleshooting or adding circuits. It is also removable, and it has a recessed pull ring and a friction dimple to hold it shut. A screw cover box is the cheaper choice when the enclosure is a one-time splice point nobody will reopen.

Body is 16 gauge carbon steel with a painted finish in ANSI 61 grey, the standard gear grey used across switchboards, panelboards, and control enclosures. If you are standardizing a plant or a mechanical room, it will sit alongside existing ANSI 61 equipment without looking like a patch.

Order Eaton B-Line part number 18186 HC. The number reads as the dimensions plus the cover type: 18 inch height, 18 inch width, 6 inch depth, HC for hinged cover. It ships as a medium single door enclosure.

Country of origin is the United States, which is the detail that matters if you are buying against a Buy American or domestic preference clause on a government, school, or federally funded project.