WL9-4012 Engineering PP Precision Instrument Case

The outer shell is 400 x 355 x 115 mm and the internal cavity is 380 x 305 x 110 mm. Externally the case occupies 400 x 355 mm while the usable floor inside is 380 x 305 mm, the difference coming from the wall section, the seal channel and the moulded closing geometry rather than measurement error. Size a load from the inner dimensions, never from the outside, because outside figures overstate capacity. A 380 x 305 mm floor with 110 mm of inner height is a large, flat body that lays out tool sets, gauges or board-level assemblies side by side; floor use is efficient but upright space is limited.

The lid adds 25 mm of internal depth and the base adds 85 mm, giving 110 mm of combined inner height. A 25 mm lid over an 85 mm base makes this a flat structure only 115 mm tall outside, which slides into shelf gaps or bench drawers, at the cost of a 110 mm inner height that rules out upright contents.When judging whether a body suits your contents, read the base figure first, because it sets how tall an item can stand, while the lid figure decides how much headroom remains above it. Only the sum of the two is usable height, and when measuring a part, include handles, connectors and bosses, or the lid will press on it once closed.

The shell uses a sealed closure and provides an IP67 waterproof and dustproof rating. A flat body has a long sealing perimeter, so check the rim for trapped debris when closing; the cavity itself protects against moisture and dust just as well as a deeper case. The rating applies to the sealed cavity of the case itself, so if you store moisture-sensitive contents, pair it with desiccant or a humidity management accessory and check the sealing face for trapped debris every time you close the lid, since a single trapped fragment undermines the seal.

The factory usage category for WL9-4012 is precision instrument cases, under code 910. The 380 x 305 x 110 mm cavity suits gauge sets, board-level assemblies, cards and small instruments laid flat, and the flat body slides into shelf gaps or bench drawers. At 1480 g it is light for a large-footprint case, which suits short transfers between production benches.

WL9-4012 is poly-bagged individually and packed 10 per carton measuring 725 x 420 x 580 mm. The carton is laid out around the 400 x 355 x 115 mm body, and because it is flat and wide only 10 units fit, so per-unit shipping volume is higher than for the smaller bodies in the series; on long-haul, freight-sensitive orders that figure is worth calculating early. Carton breakdowns, pallet plans and container loading layouts can be supplied with the order.