--- title: "corner casting: Definition and Meaning | NPSA" description: "A corner casting is a cast steel fitting at each corner of a container. Eight of them sit at the corners." url: https://npsa.preview.multisites.ai/glossary/corner-casting publisher: National Portable Storage Association (NPSA) phone: "(816) 960-6552" email: info@npsa.org --- Container parts # corner casting A corner casting is a cast steel fitting at each corner of a container. Eight of them sit at the corners. Cranes, twistlocks and lashing gear grip them to lift, stack and secure the box. They are also called corner fittings. ## Why it matters Corner castings are what make a container an intermodal tool. Handling gear locks into them, and stacking loads pass through them into the corner posts. For a portable storage operator, damaged castings are a major red flag. A cracked, bent or badly welded casting can stop a lift or fail an inspection. The ISO and older ASA designs differ in shape, so check a used box before you buy. A common mistake is to focus on dents in the walls and miss casting damage. Inspect all eight and the weld areas around them before you accept a unit. [Read: Shipping container sizes and dimensions for rental fleets](https://npsa.preview.multisites.ai/guides/container-sizes-and-dimensions) Definition source: [containerhandbuch.de](https://www.containerhandbuch.de/chb_e/stra/stra_03_01_00.html) ## Related terms [### corner post A corner post is a vertical steel member at each corner of a container. It joins the top and bottom corner castings and carries stacking loads down through the frame. A container has four corner posts. The posts give the box its strength and are welded to the rails.](https://npsa.preview.multisites.ai/glossary/corner-post)[### top side rail A top side rail is the long steel beam along the upper edge of each side of a container. It joins the upper corner castings and supports the roof. Each box has two. Together with the bottom rails they form the frame.](https://npsa.preview.multisites.ai/glossary/top-side-rail)[### bottom side rail A bottom side rail is the long steel beam along the lower edge of each side of a container. It joins the corner castings and holds the cross members that support the floor. Each box has two. It is a main part of the base frame of the box.](https://npsa.preview.multisites.ai/glossary/bottom-side-rail)[### ISO container An ISO container is a freight container built to the ISO series 1 standards, such as ISO 668 for classification and dimensions and ISO 1496 for specification and testing. The standards let boxes fit the same ships, trucks and handling gear worldwide.](https://npsa.preview.multisites.ai/glossary/iso-container)[### container inspection A container inspection is a check of a container's outside, inside, doors, floor and roof for damage, leaks and wear. Buyers do it before purchase. Operators do it when units go out and come back. It can be a quick look or a formal review to a standard.](https://npsa.preview.multisites.ai/glossary/container-inspection)[### ISO 1496 ISO 1496 is a series of international standards for the specification and testing of series 1 freight containers. Part 1 covers general cargo containers for general purposes, including totally enclosed boxes and some vented or open top types. Other parts cover tank, thermal, dry bulk and platform containers.](https://npsa.preview.multisites.ai/glossary/iso-1496) [All 220 terms](https://npsa.preview.multisites.ai/glossary) For the industry ## Grow your portable storage business with NPSA Members get event rates, the Community Forum, the directory listing and leads from this website. [Join NPSA](https://npsa.preview.multisites.ai/join-us)[See member benefits](https://npsa.preview.multisites.ai/member-benefits) Need storage? ## Get quotes from NPSA member companies Tell us what you need and where. A member company that serves your area will contact you. [Request a quote](https://npsa.preview.multisites.ai/request-a-quote)[Which unit do I need?](https://npsa.preview.multisites.ai/find-storage)