WL9-3221 Protective Case

The outer shell is 323 x 243 x 212 mm and the internal cavity is 300 x 200 x 200 mm. Externally the case occupies 323 x 243 mm while the usable floor inside is 300 x 200 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 300 x 200 mm floor with a full 200 mm of inner height makes this the narrow-and-deep body of the 9 Series: it takes about a sheet width of bench space yet stands tall instruments upright or holds small parts in two or three stacked layers.

The lid adds 35 mm of internal depth and the base adds 165 mm, giving 200 mm of combined inner height. A 35 mm lid over a 165 mm base puts almost all of the depth in the body, giving upright contents 165 mm of supporting wall and making the case more stable in transit than a shallow one; the 35 mm lid also leaves a little headroom for low connectors.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. On site or outdoors, the seal keeps airborne dust out of the deep cavity, so grit does not settle on the floor and then get dragged around by the contents. 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 categories for WL9-3221 are precision instrument cases, hardware tool cases and medical equipment cases. The 300 x 200 x 200 mm cavity suits slender or tall items standing up such as probes, sensors and lens assemblies, and can also be layered with small parts. A 1230 g weight with a 5 mm wall balances hand carrying against stacking, which fits site work and vehicle transport.

Yes. This model is supplied factory-direct from the Zhongshan plant of Kexin New Materials (Guangdong) Co., Ltd. for OEM and ODM wholesale, and linings and pocket layouts can be built to project. Start by fixing how the 300 x 200 x 200 mm cavity is divided: give upright items their own height zones with cushioning below, and when small parts are layered, remember that each layer plus its foam must stay inside the 200 mm total. Only 35 mm is available on the lid side, so if anything is to be held in the lid, confirm the lining thickness fits that figure or the two halves will press on each other when the case closes.