B-Line Eaton series Type 3/3R junction boxes, 12" height, 8" length, 12" width, 3 and 12, Screw cover, WPSC enclosure, Surface mounted, Small single

12 inches high by 12 inches wide with an 8 inch depth, which is where the 12128 designation comes from. Plan for a little extra clearance beyond the 12 x 12 footprint because the box mounts on external feet rather than flush to the wall.

It surface mounts on external mounting feet, so the fasteners land outside the box and you never break the gasket seal to hang it. That keeps the 3/3R integrity intact and lets you bolt it to a wall, a backboard, or strut without drilling the enclosure body.

Carbon steel at 16 gauge, painted ANSI 61 grey. That is a substantial wall thickness for a 12 x 12 x 8 box and the reason it weighs 12.1 lb empty. For coastal or chemical exposure where paint will eventually fail, a stainless or non-metallic 4X enclosure is the better call, since this one relies on its paint film for corrosion protection.

The 12128 WPSC uses a flanged screw cover with gasketed screws, which you fully remove each time. That is the right choice for a pull box or splice point you open rarely, and it gives a clean all-around seal. If a technician will be in the box routinely for terminations or troubleshooting, look at a hinged-cover enclosure in the same NEMA class instead so the lid stays captive.

It is supplied as a blank enclosure body and cover, styled as a small single door box with external feet. Conduit entries are field-drilled where you need them, so allow for hole seals or gasketed hubs to keep the Type 3R rating at every penetration. Any inner mounting panel or subpanel is ordered separately.

Order it as Eaton B-Line 12128 WPSC. The WPSC designation identifies the screw-cover weatherproof series, and the 12128 gives 12 high, 12 wide, 8 deep. It is made in the US.

ANSI 61 grey is the standard light grey used across most industrial control and junction enclosures, so the 12128 WPSC will read as a match next to typical panelboards and control cabinets. It ships painted from the factory, no field finishing needed.